Last significant update: Nov 2007 (Jose)

The aim of this page is to provide a rather detailed operations guide and to perform first aid troubleshooting. As some of the issues addressed evolve quickly, all experts and knowledgeable users are encouraged to modify the manual accordingly.

PDF versions of the main sections of this manual are available here (last update: 2007/03/27)

The manual covers the following DIRC operations issues:

Additional day-by-day information for the DIRC commissioner team can be found at

Day-to-day operations duties (not complete)

Before reading the manual, make sure that you fulfilled all the safety requirements for a DIRC system worker. The spokesperson Safey and the DIRC Safety and Control webpages should provide all the information you need.

When you have to use a section of the manual to work on the DIRC, do not rely on any printed copy you may have or find: it may be outdated! The instructions available on the web should always be followed.

You are the on-call expert

Be responsive to pages, always carry the pager and carry the cell phone if you are not near another phone. If you have to rely on the cell phone, make sure that the reception is adequate in your area. Some locations in the Bay Area (e.g. parts of Redwood City and San Carlos) are effectively blacked out.

When you start being on call or backup expert, perform the following tasks
Make yourself familiar with the DIRC system and the current run conditions:

Update all contact information

Attend the operations meeting in IR-2
The daily BaBar operations meeting takes place at 3:45 pm in the IR-2 Cornelius Conference room Monday through Friday. A DIRC commissioner has to represent the DIRC there every day. If the on-call commissioner is unable to attend it, he/she should make sure that another DIRC representative will be present to report the DIRC current status.

To prepare this meeting, the DIRC commissioner has to make sure that all DIRC systems work nominally or that eventual problems are being addressed by the proper experts. The relevant DIRC systems are:

Photomultipliers (PMTs), Front-End Electronics (FEE), High Voltage (HV), Electronics Cooling Water Chiller, Water Plant (including SOB Water Dump system), Nitrogen Gas Circulation, LED Calibration System, Data Acquisition System (ROMs).
Taking a daily tour of the water plant, gas rack and electronics house to convince yourself that everything is working well is mandatory.
Detector Control
• Check that the DIRC epics panels are all green and that the main parameters (crate temperatures, water and N2 flows, HV channel status etc.) are nominal.
Make sure that the front-end crate fans have been working steadily in the last 24 hours. The logfile of the corresponding cronjob is ~babardrc/CronJobs/plotFans.log. Look for errors in it if you have any doubt about the freshness of the plots displayed on the webpage. The cronjob can be reran by hand using the scripts ~babardrc/CronJobs/fansMonitoringCronJob.
The chiller power SIAM and water level SIAM can be monitored here.
The Wiener Crates can be monitored here.
The dead pmts can be monitored here.
• It is useful to have epics, the alarm handler and some scaler stripcharts always running on your office's (home) computer.
DAQ and Data Quality
• The fastmonitoring plots of all runs must be checked daily (weekends included...) to make sure that the DIRC status remains fine. Instead of checking all runs taken during the last 24h in a row, it is better to look at an handful of runs a few times per day. This should also allow you to catch new problems quicker. The corresponding documentation is available here.
•On-Call person should check the Odd runs and Back-Up person the Even runs.
• Check the background levels in the last 24 hours as well. Minimal documentation is provided with the plots. A README describes the DrcBackgroundMonitor package which is used to produce the plots automatically. The logfiles of the corresponding cronjobs are ~babardrc/CronJobs/bkgMonitoring_daily.log and ~babardrc/CronJobs/bkgMonitoring_biWeekly.log respectively. Look for errors in it if you have any doubt about the freshness of the plots displayed on the webpage. They can be reran by hand using the scripts ~babardrc/CronJobs/dailyBkgMonitorCronJob and ~babardrc/CronJobs/biWeeklyBkgMonitorCronJob.
• OPR QA postscript plots can be located using the PR QA Output page. The current OPR status can be checked in the PR Run Progression webpage. Checking the run quality after reconstruction is not among the ops. crew task: there is a monitoring expert checking the DIRC QA.
Global calibrations are taken once every 1-2 days by pilot shifters when beams are lost and PEP does not reinject immediately. Each time new DIRC calibration data are taken, an e-mail is sent to babardrc. When you see this message, you should check the quality of the calibration asap.
Bad calibrations can always be overwritten in the database but the first processing of mis-calibrated runs will be bad. Fixing it will require to reprocess these data which will delay the use of these runs for physics analysis. In addition, bad calibrations can also trigger hardware problems with the calibration systems which need to be addressed promptly.

If you notice during your checks that one automatic script seems not to be working, you should try to fix the problem asap. If it is not possible, make sure that the proper expert is aware of the situation. Having no monitoring data is as worrysome as having bad data!

Maintain the Commissioner Logbook
To help in keeping track of problems that may influence data quality, the DIRC commissioner has to update the DIRC commissioner logbook every day.
A simple 'Nothing to report' (NTR) is much better than no entry at all!

Read the e-log at least once per shiftrequires-password and respond to any comment regarding the DIRC. Report any work on the DIRC in IR-2 in the logbook: remember that you get a proper work authorization by checking in with the pilot before starting to work and by making an entry in the e-logbook.
Start any entry in the e-logbook by [DIRC myName] to allow an easy identification of who wrote what.
If you're talking by phone with the pilot (e.g. after a page), make sure that he/she understands what you're saying and that a summary of the discussion appears in the logbook. If this is not the case, call again or make the entry yourself.
You can also check the new MCC e-log although it is likely to be too technical.

Maintain Shift Instructions
In order to propagate the information on DIRC problems to the BABAR shifters, the DIRC commissioner has to maintain several short-term and long term instruction pages: Remember that shifters are taught to read long-term instructions once per block of shifts and short-term instructions once a day. So any new guidance should first appear in the short-term instructions (and in the long-term ones if needed).
If new instructions apply for the two shifters, include them in both manuals. Experience shows that pilots don't read DQMs instructions (and vice-versa) and that the quality of the communication between the shifters is not always perfect.

Check reference histos
Browse periodically the JAS plots to make sure that the reference histograms they contain are still up-to-date. Discuss any (valid) DQM comment with your FastMonitoring expert.

Maintain Contact Info
Maintain the DIRC Operations web page. Also, feel free to make changes to the ops. manual, there is plenty of room for improvement!

Maintain the DIRC system contact info in the

Keep the other commissioners and the DIRC group informed
In addition to updating the daily log, send emails about questions, news or work done to babardrc and post important problem reports or activities in the DIRC Operations Hypernews forum requires-password.

Other Duties

  • Subscribe to the DIRC Operations and BaBar Detector Operations Hypernews forums.
  • Add your e-mail address to the .forward file of the babardrc account (~babardrc/.forward). This e-mail address is used to exchange and discuss information related to the DIRC operations.
  • Subscribe to the PEPIIBBR bfmail distribution (pepiibbr) to be notified when BaBar/PEP meetings are scheduled. The subscription procedure is explained here.
  • Print a copy of the DIRC NIM paper which is THE reference for the subdetector.
  • DIRC commissioners are encouraged to take responsibility for a detector analysis project in coordination with the DIRC software experts and the ops. manager(s). Both actitivies would benefit one from the other!

There is a weekly PEP/BaBar meeting, usually every Friday at 1.30 pm. That's the best place to learn things about PEP status and plans. Each subsystem should have at least one representative in the meeting, normally the oncall expert. If you're oncall and can't go, make sure someone will replace you.
BaBar/PEP meetings are announced via the bfmail distribution PEPIIBBR to which you should subscribe.
Every Tuesday night, the oncall commissionner must prepare a short weekly report summarizing what happened in the last week. Just copy and rename the report from the previous week and fill in the new information required. Avoid to be too verbose (details should be put in the DIRC logbook which is our main tool to monitor daily operations) and don't spend much time on hunting lumi numbers: rough precision is enough! On the other hand, post the summary as early as possible (on Saturday at the latest). Then, send a Hypernews to DIRC-Operations.

Bi-weekly to monthly
The commissioner should give a report about the activities since the last DIRC meeting in the DIRC meeting, held on demand, typically once or twice per month, on Wednesday at 9 am in the Sierra room (central lab. 1st floor). If useful, prepare a small talk summarizing the main points to be discussed -- otherwise just go through the last 2 weekly reports. Post any presentation to the DIRC ops. hypernews before the meeting: this will ensure that the provided information is easily available and can be viewed by people outside SLAC.
The DIRC meeting allows for a phone conference. The current phone number is (510) 665-5437 and the meeting ID 5418. If you're not on site and want to connect to it, crosscheck these details with the meeting announcement e-mail posted on the hypernews.

One member of the DIRC ops. crew (commissioner or operation manager) has to give the DIRC monthly report. Such reports are given on Wednesday after the IR2 3.45 pm meeting. The monthly report planning is usually written on the white board in the Cornelius room. In any case, a subsystem knows at least one week in advance that it has to give a monthly report.

Collaboration Meeting
At each BABAR collaboration meeting, there is a DIRC talk in one of the detector plenary sessions. One member of the DIRC ops. crew (commissioner or operation manager, alternatively 'European' and 'American') gives a report about the activities since the last meeting and presents the status and the future plans for the DIRC.

Finally, check the Useful links section of the manual to make sure you know where important webpages are located and how to reach them quickly. Bookmark them in your favorite web browser and feel free to add new ones to the list.

How to page a system

There are several ways to page a system without going through the web and so without having an entry in the logbook:

  1. If there is a SLAC userID (for instance babardrc) associated to the pager number, you can open a terminal and type:
  2. telalert -i babardrc -m "Alejandro, what are you doing ?"

    if the shell cannot find the telalert command, try to find the full path:
    whereis telalert

  3. If you just know the pager number, you can open a terminal and type:
    echo "message" | mail 650XXXYYY@myairmail.com

    again if the shell cannot find the mail command, try to find the full path:
    whereis mail

  4. you can do the same as the previous step by using your favorite mail client, for example pine

    in the To field: 650XXXYYYY@myairmail.com
    in the Subject field:
    in the message field write the message

  5. via phone, just dial the phone number and type the extension number after the tone, followed by #

Orientation in the IR2 hall

IR2 orientation
Schematic view of the DIRC mechanical elements

To follow IR2 meetings, it is better to have an idea of the BaBar hall orientation... The picture above aims at avoiding various headaches occuring when one needs to decide which door must be opened for the DIRC! So, the backward east door is on the left when one looks at the DIRC. It protects the sectors #6, #7, #8, #9, #10 and #11. Conversely, the sectors #0, #1, #2, #3, #4 and #5 are below the backward west door which is on the right when one look at the DIRC.

How to react in case of a problem

This section aims at summarizing some advices you may follow if you're facing some problem with the DIRC.

Once the problem has been fixed:

How to recover from a power outage
Power outages randomly occur in IR2: VESDA alarms, problems with the cooling water etc. Depending on which area(s) of the BaBar hall gets powered down, some parts of the DIRC will go off. As soon as you're notified of a power outage (usually all systems get paged quickly by the shifters), go to IR2 and start investigating the DIRC status. Your goal is to bring it back up safely and as quickly as possible.
Use the following instructions as a generic guidance and adapt them if needed.
  1. Open epics and check the status of the different DIRC systems.
    Note the main variables which are in alarm (yellow or red displays) or disconnected (white displays). Alarms usually mean that systems are OFF but powered; disconnections are rather the sign that some DIRC hardware is unpowered, possibly the IOCs.
  2. Check the alarm annunciator ('beta') panel (top left panel on the pilot wall on cosoles) to see the status of the DIRC chiller and of the SOB.
  3. Make a quick tour of the DIRC hardware: water plant, electronics house (HV crates, drc-hv and drc-mon IOCs, ROMs), chiller and the N2 rack (on top of the E.H.).
    If the HV crates are unpowered, turn them to the OFF position using the key. In this way, they won't suffer more when the power gets restored. If the chiller is OFF, see if you can turn it ON -- otherwise be prepared to switch to the BCS.
  4. If there is anything weird with the gas rack (red lights on the humidity panel, N2 stopped, drc-gas IOC unpowered etc.) or with the DIRC water system, page immediately Matt and Jerry and don't touch anything before they arrive.
    If you find drc-mon unpowered, it is always safer to ask Matt to come in IR2 to have the dump valve disabled while you restore the IOC. Hence, it is worth paging him as recovering from a power outage usually takes hours: take your time, don't work in a hurry!
  5. When the power is back in the E.H., turn the HV crates and the IOCs ON. You'll likely have to reboot the IOCs once or twice before seeing them communicate again with the hardware. If you have some troubles in this phase, this may mean that some pieces of hardware are broken. Good luck...
    The IOC logfiles should help you diagnosing the problem -- look for any error showing up during the reboot phase.
  6. As soon as the DIRC and the DAQ are back, take a (global) calibration and a test run (either in standalone or some cosmics) to make sure everything is indeed OK.
  7. If drc-mon was powered OFF, remember to inhibit the BCS status SIAM channel (2nd channel of the right-most SIAM board in the drc-mon crate).

The DIRC Geometry

The DIRC Coordinate Systems (more information concerning the DIRC Numerology):

The DIRC detector space (dTag) is defined by module, section, chip and channel, like for all BaBar subsystems. The specific DIRC dimensions are (counted as: 0...n-1):

The ROMs communicate with the FEE through p-address links. The module, chip and channel coordinates are identical to the dTags and the only difference concerns the sections: p-sections follow the actual slots in the FEE ("Wiener") crates while the dTag sections count in the inverse direction. There are 16 p-sections (slots) in an FEE crate but only 14 of them are actually used for the DIRC.
The lowest non-empty slot (slot 05) is occupied by the DIRC Controller Carte (DCC) which The 2 following slots (right after the DCC) are empty. The next 14 slots (slots 8 → 21) of the VME crate are filled with DFBs. The last slot in the crate has the p-section bit (link) 15, while it has the d-section (DFB, also called "harness") 0. The first slot occupied by a DFB (after the DCC and the 2 empty slots) has the p-section bit 2 and the d-section address 14. This is an important difference. For instance, the individual register configuration of the 8 analog chips per DFB is addressed in p-space: the links go from 2^2=0x0004 to 2^15=0x8000. On the other hand, the electronics coordinates (dTags) used in the Online Event Processing (OEP) go from section 0 to 13. For convenience, the distinction between chips and channels is sometimes kludged together to one "DFB channel" coordinate, going from 0 to 63.

The DIRC geometry space consists of (counted as: 0...n-1):

The sectors correspond to a combination of modules and sections in d-space. The conversion formula reads:
Sector = 2 * Module + ((Section < 14) ? 0 : 1)
For instance, module 0 hosts the sectors 0 (modules 0 → 13) and 1 (modules 14 → 27).

The conversion from "harnesses" (which is equal to a DFB and to a section, for section < 14), and DFB channels within a given sector to columns and rows is non-trivial. A (supposedly) self-explaining FORTRAN program which is the basis of the DIRC geometry model used in the reconstruction code is available for this purpose. It may be directly called from its location using the command (working on Sun machines only):


The conversion is particularly important when one wants to identify bad tubes in a sector. It is more convenient to count columns and rows, but the cables are labeled using harnesses and channels (the actual harness numbering on the detector counts clockwise from 0 to 167 = 12*14-1, seen from outside the SOB).

The DIRC HV channels are organized in groups of 16 PMTs, all equally distributed between 2 harnesses of a same sector. Thus, there are 56 HV groups per sector and 672 for the whole DIRC. The individual HV settings have been chosen in order to maximize the efficiency and purity of the PMT signals. It is therefore crucial to make sure that the group settings visible through EPICS panels correspond to the nominal values.
The sector plus HV group to HV setting conversion is also a feature of the above "position.run" executable.

Troubleshooting: The DIRC coordinates are closely related to the actual cabling of the crates, boards (harnesses), HV groups and signal channels. Miscabling of a HV group will show up as a hot group of 16 channels and a corresponding cold group in the same sector. Miscabled optical fibers will interchange whole sectors. This shows up as interrupted Cherenkov rings in the Event Display. Interchanged harnesses or signal cables however require a high statistics single tube Cherenkov angle analysis. Cable errors are corrected via software during the dTag-to-gTag conversion.

The module IDs (0...5) are set by dip switches on the controller card of the ROM. Wrong Ids show up as invalid or doubled module numbers printed on the xyplex windows after a reboot.

DIRC Hardware

PMTs: The quality of the PMTs is primarily controlled by the periodical calibrations and the fast monitoring data.

Troubleshooting: The main reason for PMTs to become noisy is a decrease of their air tightness around the base joints. PMTs with a bad vacuum scatter light to adjacent tubes generating the so-called "Christmas tree" pattern. The funniest example of such a spitting PMT is shown here; FYI, the noisy PMT sits in column 1, row 1 of sector 4 and is in fact dead for signal photons. A Xmas tree usually trips the HV channel which powers it. So, 16 PMTs are (temporarily) lost when a Xmas tree shows up as one cannot keep its voltage at the nominal setting. Nothing can be done until we get an access to the backward side of BaBar.

As such access is likely to be decided at the last minute because PEP and/or BaBar need some urgent repair, do not forget to put your access request on the white board in the control room to make sure that the run coordinators are aware of it and that the pilot will page the DIRC when the opportunistic access is being set-up.

During the access, the faulty PMT must be disconnected from the HV. It is mandatory to identify the unplugged HV cable (sector, row, column) and to explain why/when/by whom it was disconnected. Make sure that you unplugged the correct PMT before the door gets closed again:

From time to time, PMTs can also become noisy. Usually, the noise comes and go on a few hours timescale without any clear reason. Noisy channels can be ignored during cosmics data taking as the PMT rate is much lower than during colliding data taking. If a PMT gets too noisy, it can be masked (i.e. removed from the Data Acquistion) by the DIRC online expert. Practically, a PMT is too noisy if the number of hits it generates prevents the DQMs and the DIRC crew from checking accurately the occupancies in the DIRC.

Tip: There is no guaranteed recipe to locate a PMT responsible for a Xmas tree: that just makes the game nicer! Here are a few tricks...

Locating a noisy channel is simpler. The Fast Monitoring plots should tell you the sector, the HV channel and possibly the harness which contain the noisy PMT. Crosschecking this information should leave you with a few candidates. A final look at the first page of the Fast Monitoring plots taken during a run in which the PMT was noisy should allow you to remove the ambiguity: the noisy PMT appears as a black dot on the hit map.

Scalers: 12 PMTs (1 per sector) are used to monitor the background in the DIRC. They are called scalers and integrate hits 0.5 seconds every 4 seconds -- the gate enabling/disabling the scalers comes from a generator, which for historical and now obscure reasons, belong to the IFR. The number of collected hits is multiplied by 2 (to have 'Hz') and then sent to epics. The location of the scalers in the DIRC is explained here. Information from the scalers is the most important input data for DIRC background survey.

Front-End Electronics: The FEE boards (14 DFBs and 1 DCC per sector) are located within the magnetic shielding which renders them inaccessible during normal BaBar and PEP-II operation. The Fast Control global commands in one direction, and the FEE data in the reverse direction, are sent through optical fibers (2 per FEE crate) which connect the 6 ROMs to the 12 DCCs.

Troubleshooting: Possible DCC problems concern mainly the distribution of the 15 MHz clock to the DFBs. The symptoms might show up as one or more completely failing DFBs, or even a complete module (2 sectors) which does not show any data hits. A missing clock disables the DFBs to receive commands and to send data synchronized with FC. The data received by the ROM are then not recognizable as such and are rejected by simultaneously setting the DLINK damage flag.

Troubleshooting: DCCs are also used by the trigger group. They have their own set of boards which includes some spares. If for some reasons one board is loaned to one group by the other (DIRC → trigger or trigger → DIRC), one has to remember that the S1 switch (red switch at the bottom of the board) may need to be moved to make the board work for the other subsystem.
For instance, a DIRC spare board was given to the trigger folks during the October'05 shutdown to replace temporarily a broken DCC shipped back to France for repair. To make it work in a trigger crate, the S1 switch had to be moved from the left to the right.

A DCC inventory (DIRC+trigger) can be found here. The DIRC has also its own inventory available from the DIRC operations web page.

DFB problems are more difficult to diagnose: errors during the FEE configuration (messages printed on the xyplex windows) could be a hint to a malfunctioning DFB. Other hints are dataflow damages, such as "out-of-order" (wrong trigger tag) or "out-of-synch" (wrong time-stamp). These damages are listed as part of the default Fast Monitoring histograms (page 3, top-right plot). The easiest way to test whether a board malfunctions is to mask it off and to see if the errors observed disappear. Again, the replacement of a FEE board is only possible during an access with open rear doors (magnetic shield). Spare DCCs as well as DFBs are available in the DIRC area (located upstairs at IR2) and as part of the DIRC IR2 teststand crate.
A not-working DFB is not by itself a reason good enough to request an immediate door opening. As harnesses read PMTs along DIRC radii, a dead DFB would make the DIRC reconstruction miss at most 1-2 photons for approximately 20-30% of tracks.

In case of problem on a DCC, a mail must be sent to Denis Bernard and Antoine Mathieu from the Ecole Polytechnique lab. To be repaired, the board must be shipped back to this lab.
Troubleshooting: do not forget to protect the 2 connectors in which the optical fibers (= Finisar links) are normally plugged in. Use tape if you cannot find some fiber covers.
A few covers should be available in the drawer where the keys of the DIRC cabinets are stored. Don't loose them! Put them on the DCC finisars which are not used to protect them from dust.

The LAL is in charge of the DFB support; therefore, in case of problems, an e-mail must be sent to Anne-Marie Lutz (LAL P.I.) and Dominique Breton (LAL electronics ingenieer). DFBs are usually repaired at SLAC by Dominique when he comes at SLAC.

If the problem is just a damaged or unsoldered component, Lupe Salgado and her team can fix it at SLAC (ask Antoine or Dominique first!).

An interrupted optical fiber path due to damaged fibers or bad contacts is identified by the error message "Error: Odf boot task 5" printed on the xyplex windows after a reboot of the ROM. In addition, the configuration of all DFBs in this crate will fail and the datagrams sent will be empty. Finally, the "Ready" LED on the corresponding ROM and fiber should glue red and, in case of a light transmission failure, the corresponding Finisar EPICS panel should indicate errors.

Front-End crate Power: The 12 DIRC front-end crates take power from two power boxes located on the backward sides of BaBar: one on the west side (powering sectors #0 to #5) and one on the east side (powering sectors #6 to #11). Labels have been put on the power cords to allow an easy identification of the sector powered by a given cable. The picture below shows the way the 12 cables were plugged in during the October 2005 shutdown.

power cords organization
Front-end crate power cord status on 2005/10/19.

If some cords are moved in the future, it would be nice to update this picture: the xfig file in $BFROOT/www/Detector/DIRC/Operations/ should be used to overwrite the gif picture displayed here.

The two boxes are powered by a panel located on top of the detector. Between this panel and the sector crates, there is a relais (also located on top of the detector, about 2 meters away from the main box) which is controlled by the DIRC chiller: chiller running ↔ relais closed; chiller not running ↔ relais opened. The control line of the relais is supplied by 24 V provided by a power supply located in the electronics hut in a DCH rack (B620B-10, the PS is actually hidden behind a front plate!). The open/close status of the 24V is given by the chiller SIAM output.

High Voltage System: The DIRC HV power is supplied by 6 SY527 CAEN crates. Each crate is powering 2 consecutive SOB sectors. They are located in Rack #5 and #6 in the Electronics House. Each CAEN crates contains 8 independent HV boards which can power each 16 HV channels (called groups). Their status and the HV settings are monitored by dedicated EPICS panels.

An alternative, but discouraged way to connect to the crates are the serial "xyplex" lines, available for each CAEN crate using the command:
xyplex drc-caeni where i=1...6 is the number of the CAEN crate.
Troubleshooting: For security reasons, the access to all HV power supply serial lines has been restricted on August 12th 2005. Therefore, these connections can now only be done from a limited number of machines which have AFS and regular home directories: bbr-reflin, bbr-reflin1 (Linux machines) or bbr-refsun and bbr-refsun1 (SUN machines). By default, users are not allowed to log in these machines. If you think you need such permission for DIRC-related activities, please send an e-mail justifying your request to ir2-admin with the DIRC ops. manager(s) in cc. Otherwise you can connect to these machines using the DIRC generic account babardrc.
Once the xyplex session has been setup, pressing "D" displays

It is under all circumstances forbidden to operate the HV when the SOB is open to light.
There are 6 closable glass windows in the SOB which allow visual inspection of the inside. One should check that all of them are closed before turning the HV ON. In addition, if one of the optical fibers used to transport light from the DIRC light generator crate to the SOB is unplugged, some light enters inside as well.

In addition to turning the HV off with epics, the following actions are mandatory before starting any work involving the DIRC HV system.

  1. Read and sign the non-routine JHAM describing the work planned.
  2. Turn off the HV crate using the unique key which should be in one of the crates. This hardware interlock switch guarantees that the HV supply is interrupted.
    Keep the key in your pocket while you're working on the DIRC HV.
    If the key get lost, don't panic: any IR2 CAEN crate key should fit!
  3. If you plan to work on an HV board, unplug the power cords at the back of the three crates which are in the rack. Then, wait for the red light to turn off to make sure that all capacitors have dissipated their charges.

Faulty HV boards (or crate) must be brought to Paul Stiles, the SLAC technician in charge of them. Ask Ray Rodriguez for more information if needed.

Electronics Cooling: When the doors of the magnetic shield are closed, the FEE crates need to be cooled to evacuate the power dissipated during the running of the detector. Therefore, cooling radiators are attached to the inner side of the shielding and come close to the crate fan trays when the doors are closed. The cold water circulating in these radiators is supplied by the DIRC Water Chiller. The inspection of the chiller is part of the routine BaBar shift tour.

Troubleshooting: The DIRC chiller is connected via a SIAM (located in Rack #07 in the Electronics House) to the two BaBar enunciator (VESDA) panels, located in the Electronics House and in the control room. A SIAM trip caused by a chiller malfunction opens a relay, located on top of the detector (and thus inacessible during normal running) which simultaneously interrupts the power supplies of all 12 DIRC FEE crates. Such a malfunction could be generated by a broken chiller fuse or an IR2 power cut. After removing the cause of the failure, the SIAM needs to be reset and the FEE crates can be turned on via the FEE EPICS panel.
Similarly, it may be necessary to inhibit the Backup Cooling System (BCS) on the SIAM after a general power cut. If the BCS is not inhibited whereas we rely on the DIRC chiller, FEE crates cannot be turned on. If everything else looks normal and if the FEEs do not want to be powered ON, the corresponding LED on the SIAM is worth being checked. See the chiller problem section for more details.

If the DIRC water chiller breaks, one must use the Backup Cooling System (BCS) requires-password to cool the front-end crates and minimize the interruption of data taking. The BCS can only be used by one subsystem at a time. So, in case we need it, we have to inform the other potential users of the BCS (DCH, EMC) that it is currently in use. Investigating the DIRC chiller problem should start immediately by notifying the Site Engineering Maintenance (SEM) / Heat Ventilation and Air Conditionning (HVAC) with an urgent trouble call.
Instructions to switch from the DIRC chiller to the BCS can be found in a dedicated section requires-password of the Care and Feeding Manual. To make such switch as smooth and quick as possible, it is recommanded to try this operation outside of the data taking periods, possibly during ROD, more likely during a shutdown. Walt Innes can help you to setup this test and give advices if needed. To avoid interfering with other works, the request must be presented well in advance in one IR2 operations meeting.
To be able to turn ON the front-end crates while using the BCS as cooling system, the DIRC chiller SIAM must be inhibited. Remember that there is no additional protection of the crates if the BCS fails. So, one should be cautious when operating the BCS: the temperatures of the crates must be monitored with care.

Ensure that the chillers will never be operated without having a open path from the outlet to the inlet! Otherwise, either the chiller pump or the valves will break.
Remember that without any chiller the FEEs are no more cooled. So be sure to know how to operate before switching the chiller off if the FEEs are ON!

When the BCS is working, tell the shift leader that the DIRC is operational again. Make notes in the logbook and arrange the repair of the DIRC chiller if needed -- don't forget to switch it off in this case. Before leaving IR2, monitor the system (temperatures and values at the BCS, temperatures of the FEEs) for a sufficient amount of time.

Water Recycling System: The SOB water circulation system is located behind the Electronics House in the IR2 entrance hall. The inspection of the water system is part of the routine BaBar DQM tour, done once per shift (see the DQM checklist for details). An EPICS panel informs about water level, temperature, pH values. A detailed DIRC expert checklist provides guidelines about how to fill the SOB and how to maintain the cleaning system, and what to do to recover from a power outage.
The DIRC water plant is a sensitive part of the DIRC system. Commissioners should not try to fix anything on it unless they were given special instructions to do so. The safe procedure is to page the water plant experts, Matt McCulloch and Jerry Va'Vra -- if needed.

Troubleshooting: After a power outage, the circulating pump might not restart by itself. If the SOB water level falls, you might want to check that the pump is running. See specific instructions here. If any of the water plant pumps is dead, water plant experts should be notified. Spare pumps are available but an electrical tech. is required to replace a pump safely.

SLAC pressured air supply: The valves in the Water Recycling System are controlled by pressured air.

Troubleshooting: In case of an outage of the air pressure a small DIRC reservoir will provide pressured air for about two hours. If the outage is expected to be longer, contact a DIRC water expert.

Nitrogen Gas Circulation and SOB Water Dump System: The DIRC DIRC Gas System detects water leaks by measuring the humidity level of N2 within each barbox and looking for water inside the barbox slots. There is a total of 4 leak sensors per barbox, although some are shared between barboxes. Signals on any two sensors on the same barbox will trigger a SOB water dump. The sensor electronics is located in Rack 5, on top of the detector, and the majority logic electronics that creates signal for the dump is located in Rack #38 on the top of the Electronics House. The humidity level and the N2 flow are read out via the DIRC Gas System Epics panel.

Troubleshooting: The Gas system is connected to uninterruptable power (UPS) which means that batteries located in IR2 take over the electricity supply in case of a power outage. In addition, the dump module has an independent battery which will however not last longer than 4-7 hours. In case of a power outage it is important to check that the UPS works. A complete power loss might cause the SOB dump valves to open!

Power Outages: Relatively frequent power outages in the Electronics House due to cooling problems or VESDA alarms need the following actions:

  1. Once the power is back, the 2 DIRC IOCs located in the E.H. (drc-mon and drc-hv) need to be rebooted.
  2. If the software reboot seems not to be working, go to Rack #07 in the E.H., and check that everything looks OK: boards (VSAM etc.) may die during a power outage. If there is no obvious problem, reset the IOCs by pushing the... 'RESET' button (!) to trigger a reboot.
  3. Boot time depends on the IOC: ~5 min for drc-mon and only ~2 min (!) for drc-hv which is now a PowerPC running at 1 GHz on RTEMS! With the old 66 MHz board running on VxWorks, the boot time was rather ~15 minutes....
    Once the boot is finished, the corresponding epics panels (front-end and HV for instance) should show green (OK), yellow (minor alarm) or red (major alarm) status colors instead of white which means 'channel not connected'. HV sectors and front-end crates may need to be turned on manually using the "ON" buttons on the corresponding panels.
  4. If the power outage was extended to the DIRC Gas Rack #37, the drc-gas IOC needs to rebooted in the same way as the other IOCs. Check that the Nitrogen gas flows -- both rotameters (upstream flows) and electronic flowmeters (downstream flows) -- show nominal values.
  5. If the power outages included the water system, check the status of the dump electronics and the valves. Check the air pressure on the air tank as well, reset the water pump and check that the vacuum pump is running. Before doing so, look at the sections of the manual dedicated to the water plant. Do not hesitate to call an expert if you're not sure of what to do.

DIRC Detector Control

The DIRC has 3 independent Input-Output Controller (IOC) modules to which serial link connections can be established from the proper IR2 machines:
(serial link: xyplex drc-mon) controls 12 PMT hit rates (scalers), low voltage, temperature and status of the FEE boards and crates, the values of the magnetic sensors and the light transmission intensity of the optical fibers through 2 daisy-chained CANBUS systems, one on the Wiener FEE crates and the other on the DCCs. In addition, the gas humidity and flow readout as well as the SOB status are controlled here. The corresponding setup files (database libraries) are found in the directory:
(serial link: xyplex drc-hv) controls the HV configuration and status. The database setup files are found in:
More information on the HV control system can be found here.
(serial link: xyplex drc-gas) controls the SIAMs of the various gas humidity sensors. Equivalently to the other IOCs, the database configuration files reside in:
In fact, drc-mon, drc-hv and drc-gas are 3 symbolic links which point to the last versions of the packages, currently used in production. The BaBar packages containing the IOC codes are epics-drc-mon, epics-drc-hv and epics-drc-gas.

Epics variables are normally initialized with upper and lower alarm thresholds. These limits are set in the db/ subdirectory of the corresponding IOC package. The alarm status of variables is visible on the epics panel through a color code (OK, minor alarm, major alarm or not connected) and variables linked to the ALarm Handler (ALH) produce audible and visible alarms on the pilot console when they go outside their nominal range or loose connection.
The DIRC ALH configurations are stored in the alh/ subdirectory of the IOC packages. There are usually two files per ALH section: one for the normal data taking conditions with all alarms enabled; one for the shutdown periods with several alarms disabled. As parts of the DIRC are usually turned off during shutdowns, disabling the alarms prevents from overloading the ALH panels with fake alarms.

To know more on an epics variable middle-click it on the epics panel. This should open a small grey popup window displaying the name of the variable. By clicking then on 'Examine', you'll access some important parameters of the variable: its scanning frequency and its alarm thresholds.

Ambient database: Several DIRC epics variables are archived in the ambient database. These data allow one to monitor the DIRC behavior over long-time periods or to make detailled studies of the DIRC status at a given time in the past. In particular, two important components of the DIRC monitoring (front-end fan speed monitoring and background monitoring) are extracting their data from this database.

Among the monitored variables, one can find:

There are two main ways to access ambient data.
  1. To use the ambient browser.
    This is the simplest way to create quick plots. If you're working on a linux SLAC workstation, a convenient way to start it is to click the button 'Ambient Browser' on the right part of the main BaBar epics panel. This should open a window similar to the picture below.

    Screen shot of the ambient browser showing some of the DIRC epics variables archived in Ambient.

    If you're working from a remote site, it is much simpler to install JAS on your computer and to connect to the BaBar ambient server from there. This will prevent you from importing the browser from SLAC in addition to the monitoring data you're interested in! Otherwise, the browser will be very slow and may crash quite often...
  2. To use OdcNtupleMaker.
    This nice tool (managed by Andy Salnikov) uses a time range and a list of epics variables as input. It produces a ntuple (PAW or ROOT format depending on the user's request) which contains the time history of all the selected variables over the chosen range. The ntuple can then be analyzed offline using suitable macros.
    The directory $BFROOT/detector/drc/Odc/ shows several examples of input datacards (files with the .inp extension). The conventions used in these text files should be pretty straightforward. The file analysis.kumac contains PAW macros which can be used to analyze ntuples produced by using the .inp input files.
    • TIME_WALK_SCALERS_NEW: plots of the scalers, PEP-II luminosity and LER/HER currents versus time;
    • FREQ_VS_I: the scaler rates versus LER current or luminosity for all sectors including fits of the linear and quadratic components, if required;
    • I_AND_HV, ALL_V: the current and HV stability;
    • PLOT_TEMP: the FEE temperatures;
    • TIME_WALK_HUM_FLOW: the gas flow and humidity versus time.
    Warning: this directory has not been used for years and so its contents are expected to be quite old-fashioned. Therefore, use them with care: they are good examples of what one can do with OdcNtupleMaker but they may not be directly usable.
Adding new channels in Ambient is quite straightforward. Details can be found in a dedicated guidance webpage or in this hypernews.

Some information about epics

For information and pictures, see here.

DIRC Online

Data Acquisition System (ROMs): The DIRC DAQ system has 6 "segment" level ROMs and 2 "fragment" level (slot-one) ROMs divided up into 3 logical DAQ crates, located in the same physical crate in the Electronics House. In the dataflow conventions, these crates are 18 (0x40000), 19 (0x80000) and 20 (0x100000). The "segment" level ROMs communicate over optical fibers through the DCCs with the DFBs, send commands and receive the TDC and ADC as well as header and status data.

The datagrams are received with a clock frequency of 15MHz. Once arrived in the single board computer in a ROM, they are "feature extracted" (FX) i.e. cleaned up from header and status words and checked on their structure. The results of these checks are sent to the event level as an FX-status word which is traced in the DIRC fast monitor. Status values above 20 are fatal errors for which FX sets the dedicated FX-damage bit. Currently, all ADC data are truncated within FX in order to speed up the dataflow within the ROMs and to prevent dead time. In presence of high machine background, it may happen that the FX status reaches 9 or higher which means that TDC data are truncated too. This must be observed as it affects the DIRC reconstruction (loss of data).
The most recent (August 2005) information on the FX status can be found here.

The "fragment" level ROMs collect the data from their logical DAQ crates and send them to the event level (UNIX).

In order to debug ROM functions like library loading, configuration, calibration or running, it is useful to open serial lines through the xyplex board. The command

opens 6 xyplex connections (xterms) for the 6 segment level ROMs. As only one serial line can be open at a time, one may need to use
first which closes all existing DIRC DAQ xyplex connections.


FEE and Finite State Machine (FSM) Configuration: Before starting a data taking run or a calibration, the individual registers of the DFBs need to be configured. This is performed during the so-called "Configure Transition". The system which drives the configuration is "Reverse Dataflow" (RDF) which itself is driven by "keys". Each key (top-key) is linked to a hierarchy of configuration data for each subsystem involved. These data are usually read from files (in xtc format) and the correspondance between a key and the files in the configuration tree is fetched from the configuration database during the configure transition. The DIRC has 2 types of configuration files: DrcRegisters for the FEE register configuration, and DrcCycles for the FSM and FX or Calibration configuration. The corresponding files are located in:


There are 6 different DrcRegisters configuration files, one for each ROM. The executable TestDrcRegisters (in the same repository) allows to transform a xtc file into readable ASCII format. The structure of the FEE configuration is the following:

group register_address value linkA linkB
where the groups are data taking (0) and calibration (1). The links determine which FEE element is addressed by a particular register configuration. LinkA talks to the even sector number served by a ROM and linkB addresses the odd sector number. The only individual register settings define the gains of the analog chips (8 ADCs per DFB, register addresses 0x0-0x7) which are different for each ADC. The DCCs have 2 sectors (calibration strobe ON and the calibration strobe delay) which must be addressed through the first DFB in the front-end crate which is linkA/B = 0x1.

See also the section Masking a noisy channels.

Troubleshooting: Configuration errors show up during the configuration procedure when the written values are read back from the configured registers and compared to the settings. If differences are found, they show up through an error mask printed by the ROMs (e.g. onto the xyplex xterms) for each register that failed. The mask corresponds to (linkB << 16) + linkA for the FEE elements which show a wrong configuration. If these errors persist one may try to "power-cycle" the corresponding FEE crate and if this does not help it is a serious sign of a malfunctioning DFB (or DCC, if the clock distribution failed).

If one or more harnesses (or even a whole ROM) fails, it can be necessary to mask out bad FEEs. This is done with the help of the executable:

/nfs/bbr-srv02/dataflow/rdf/Drc/FE/DrcChangeLinks -f <DrcReg.xtc> <0xabcdefgh>
The inputs are the original register configuration file, DrcReg.xtc, of the ROM for which the problems occurred and the error mask as printed by the ROM 0xabcdefgh (you may cut-and-paste it). The output file <DrcReg_offabcdefgh.xtc>. contains the new configuration for which the bad elements are masked off.

FastMon: For information about the Fast Monitoring, check the dedicated webpage.

Calibration: Many of the final tools of the DIRC calibration system are already in place, some are still in development. All DIRC calibrations are started with the help of the calibration GUI (tk library):

Which is an alias defined, e.g., in the setup script of the DIRC account: babardrc. In future this is supposed to be an expert tool for deeper studies and debugging, while all default calibrations are performed by the BaBar DAQ shifter using Run Control (ORC). All calibrations exist in a monitor and a database mode. Both modes produce ntuples which can be analyzed with the help of the various "Check Results"-type buttons. The GUI is a simple command line executer. It starts tcl and csh scripts which then calls the respective actions. All relevant calibration scripts reside in the directory:
Temporary files needed for the database validation (there is an absolute validation of the calibration results with respect to some initial ranges and a relative validation by comparison with the previously stored results), various checks, the hbook ntuples and the log files of the different calibration levels (event level, control level) are saved at:
The individual DIRC calibrations are:
Online T0 calibration
(using LED flasher): fits the individual T0's of all PMTs. The most important contribution to the T0 derivation between channels originates from the different HV settings: dT0/dHV = (-15 +/- 1) ps/V.
ADC calibration
(using LED flasher): fits the single photoelectron peak and the threshold of the ADC spectrum
Electronics calibration
(using DFB's internal charge injection) -STILL IN PREPARATION-: fit the gain (slope) and the pedestal (ADC offset at zero charge injection) and the threshold (ADC signal rise) using the charge injection facility of the DFBs.
Occupancy calibrations
-STILL IN PREPARATION-: there are 3 different types of occupancy calibrations
  • PMT noise calibration taken without beam and LED
  • Background calibration taken in presence of beam
  • LED occupancy calibration used in order to monitor the LED light intensity and to take fast snapshots of the system for debugging purposes.
DFB serial number calibration
this "calibration" is used in order to attribute the correct gain settings (lab measurements connected to the DFB serial number) to the FEE elements used in the detector. It only needs to be performed when DFBs have been exchanged.
Troubleshooting: If a calibration fails its validation this may trigger some hardware problems. Check on the EPICS panels that all FEE boards are functioning normally. Press the "Check Results" button and watch the hitmaps and occupancy distributions for abnormal shapes.

If error messages appear on the event level and/or the shared memory reader xterm(s), there may be a mismatch between the various scripts and tcl files interacting during a calibration.

If the control level does not proceed the different minor cycles, check on the xyplex windows if it counts the calibration pulses. If this is not the case there may be a problem with the internal dataflow pulser.

Additional Features: The calibration GUI contains two panels that are very useful shortcuts to frequently used tools: a) the DRC scaler rate history and correlation with the LER current and b) the time history of the calibration values. Both are started by clicking on the aprropriate panel and entering the time interval into the pop-up window (comply with the format given).

Plot Scaler Rates
Clicking on this panel produces an ntuple using the above mentioned OdcNtupleMaker with the standard ntuple variables: HER+LER currents, luminosity, and scaler rates. The input file is defined in the shell script
The output file is written to $BFROOT/detector/drc/tmp Then the macro $BFROOT/detector/drc/DrcCalScripts/ntuplemaker.kumac is run on the ntuple and produces a 2 page postscript file. Finally, a ghostview process displays the PS file. Quitting ghostview returns you to the GUI.
Plot calibration history
This command used the DrcCondNtupleMaker to plot a large number of calibration constants as a function of time. It generates a 26 page postscipt file and launches a ghostview process to view the output.
Teststand: Upstairs in IR2 (bldg 621, room 201) we have a teststand which is used to test front-end components (power supplies, fans, boards etc.). Spare HV boards, tools etc. are also stored there -- we also have 2 cabinets in this room; the one closer to Ray's office contains the front-end spare boards and the tools used by Orsay engineers to test and fix the DFBs.
Safety guidances:

Taking a DIRC standalone run

  1. First and foremost, never start this procedure unless you are in the BaBar control room. Make sure that the pilot is aware of your work and gives you the green light.

  2. Obviously, the DIRC HV need to be set a nominal voltage to take meaningful data.

  3. Find in the logbook the last Physics run and write down the current physics key (this is 0x7ba (=1978) as of January 22nd, 2003).

  4. Log in to bbr-farm02 (or any other not-overloaded dataflow machine like e.g. bbr-farm04 or bbr-farm07) and open two more terminals.
    (Note: Do not use x-terms because fcgui below may not work and if fgui still does not work below try sourcing drcSetup.csh).

  5. Find out what the current release is
    bbr-farm02:~> which showPartitions
    showPartitions: aliased to /afs/slac.stanford.edu/g/babar/dist/online_releases/8.14.1/bin/SunOS58/showPartitions
    In this case it is 8.14.1

  6. In one terminal, type (replace 8.14.1 with the current online release)
    cd /afs/slac.stanford.edu/g/babar/dist/online_releases/8.14.1/
    <RETURN> WARNING: before pushing <RETURN> the second time, check that the default BFARCH is the same as the one included in the showPartitions path, normally SunOS58_sparc_WS6U1. If this is not the case, select the correct BFARCH.
    cd $drc/bin
    to start OEP (the event level). This will open a new window called "OepLoggingApp". If this doesn't work, check the BFARCH value (see above).

  7. Then go to the second terminal and type
    cd $drc/bin

  8. Add the directory $ODF_ROOT/package/shlib/$BFARCH to the LD_LIBRARY_PATH:
    setenv LD_LIBRARY_PATH "${LD_LIBRARY_PATH}:$ODF_ROOT/package/shlib/$BFARCH"

  9. In this terminal, type
    fcgui -k 0x7ba -c 0x1c0000
    where 0x7ba is to be replaced by the current key (preceeded by the 0x!) and 0x1c0000 is the DIRC crate mask (do not change it!).
    This will open an "ODF Sequencer" window which looks like this:
    FCGUI Main window

  10. Click on the 'Allocate' button.

  11. Click on the 'Arguments' button. This will open the following window:
    FCGUI Arguments window

    Check that the configuration key is correct; then close this window using the 'Close' button.

  12. Click on the button 'MinorCycle'. The button label will first go red and then green. In the message window at the bottom, you will see the 'Last received transition' change. The 'Last damage:' has to stay none. In case of a problem in the partitioning or configuring phases, the key and/or crate mask is likely not to be correct: crosscheck your inputs!
    Another possible problem: the ROMs may need to be
    rebooted. For instance, ROMs must be rebooted each time the FEEs are switched on... Try to avoid rebooting the ROMs if this is not mandatory.

  13. Click on the 'Calibration' button. This will open another dedicated window:
    FCGUI Calibration window

    Change the settings in the window to match the ones in above picture:
    • Cycle is Internal.
    • Commands 1, 2 and 3 enabled (i.e. button pressed, 'Disable' is visible).
    • Command 1 is set to L1Accept.
    • Command 2 and 3 are set to NoOp with a delay of 64000 (ticks).
    • Counts field is set to 0.
    Once this is done, click on 'Apply' and then 'Close' the window.

  14. Click on the 'Enabled' transition in the main 'ODF Sequencer' window. This will start the standalone run.
    Check that data are indeed accumulating on disk in the new xtc file created by the fcgui command. You can use the following command line:
    ls -ltrh /nfs/bbr-srv02/calib/drc/conditions/drc/ | tail -3
    Check the file size regularly to make sure that it is growing at a reasonnable rate.

  15. Typically, you want at least 150 kEvents for a random trigger run. This corresponds to an xtc file size just under 100MB.
    Obviously, if some PMTs are noisy (e.g. because there is a Christmas tree ON) events will be much bigger and so the number of recorded events should be significantly reduced. Otherwise, analyzing the hbook will take ages and may even fail!

  16. If you take a random trigger run to analyze dead and inefficient PMTs you will have to collect more events. For a typical analysis, you need to take about 5M events. To avoid problems with disk space or hbook file size, please split the 5M events in smaller runs of about 1M triggers each. Remember to check the available disk space for the xtc files on the output disk:
    df /nfs/bbr-srv02/calib/drc/conditions/drc/
    A run with 1M events will take 500-700MB for the xtc file. It may therefore be necessary to move each xtc file to the DIRC NFS disk /nfs/farm/babar/drc/babardrc.
    Don't fill up the /nfs/bbr-srv02/calib/drc file system! If this disk area gets 100% full, the calibration monitoring job will fail next time a calibration is taken!

    Please remember to clean up after yourself when the xtc files are no longer needed.

    If the /nfs/farm/babar/drc/babardrc file system is filling up and if you need disk space there to move files from the bbr-srv02 file system, please consider backing up the data from /nfs/farm/babar/drc/babardrc to mstore. The path to the babardrc mstore repository is /nfs/mstore/u/babardrc. A typical sequence of mstore commands would be:

    • The minimum file size for mstore is 100MB, the maximum 10GB. For larger files use the astore command. If the files are smaller, create a compressed tar archive of the files you want to archive, let's call that myruns.tgz (you could use the $BFROOT/work/b/babardrc area for that purpose).
    • Create an entry in mstore with the command
      mstore create /nfs/mstore/u/babardrc/myruns.tgz
    • Copy the file to the mstore entry with the command
      cp myruns.tgz /nfs/mstore/u/babardrc/myruns.tgz
    • Write the file to tape with the command
      mstore put -p -v /nfs/mstore/u/babardrc/myruns.tgz
    • Now you can safely delete the xtc files and the tar file on /nfs/farm/babar/drc/babardrc. (You will be able to retrieve the file from mstore with the mstore get ... command.)
    • To see what has been stored, just type
      mstore ls /nfs/mstore/u/babardrc
    Don't forget to check first if other users (not babardrc) are responsible for filling up /nfs/farm/babar/drc/babardrc. If someone other than babardrc is using more than a few hundred MB, ask them politely to delete the files asap or have the Slac Computing Service (SCS) delete the files for them...

  17. Once you have accumulated enough data, end the run by clicking on the button labelled 'Halted'. This button will end the program and release the partition. The ROMs should all be ready to run again without rebooting.
    Please note, If the run ends abnormally, use the blue buttons labelled 'Reboot' and 'Dissolve'. Click the reboot button first if the ROMs need to be rebooted. You can check in the xyplex windows (you can start those with the
    command) that all the ROMs began to reboot, and use ctrl-X to reboot any which didn't. Then click the 'Dissolve' button. This will gracefully clean up the partition. Failure to do this (e.g., killing the GUI with ctrl-C) may require manual intervention in the master crate.

  18. Tell the shift leader that you are done and clean up the terminals.

Looking at the results of a DIRC standalone run

First process the run to make an ntuple - DrcOedPlayback is a convenient way to do that.

How to run DrcOedPlayback

For instructions with some pictures, see here.

Taking a DIRC standalone calibration

  1. First and foremost, never start this procedure unless you are in the BaBar control room. Make sure that the pilot is aware of your work and gives you the green light. Also make sure the high voltage is set to V0.

  2. Log in to bbr-farm02 as babardrc:
    ssh -X babardrc@bbr-farm02
  3. Setup the release and the working directory:
    cd $drc/newDrcNfs/
    source ir2_setup.src <current online release> (e.g. 17.1.0)
    [The release number is written in the file DrcCommissioner/.online.]
    cd DrcCommissioner
    srtpath Choose SunOS58_sparc_WS6U1 as BFARCH (not the default so far)
    cd workdir
  4. Launch the calibration GUI:

    DrcCalibration GUI
    DrcCalibration GUI
  5. Click on "Scratch key run (are you sure??)" to launch the calibration. This will open 3 windows one after the other one and the whole process should take around 2-3 minutes.
  6. To look at the calibration results, click on "Check last scratch-key LED calibration":
    this will open another window where you have to choose what file to check calibration_scratch.hbook
  7. The result of the calibration is in the directory /nfs/bbr-srv02/calib/drc/ :
  8. The same instructions above apply for taking a TDC or ADC calibration. The only difference is the name of the output hbook file which is ./hbook/calibration_(tdc/adc)_YYYYMMDDHHMM.hbook
    And they can be checked with the button Check standalone LED calibration

Checking the last global calibration

Global calibrations are taken by the BaBar pilot through the ORC interface, usually once every 1-2 days when PEP cannot immediately reinject after a beam loss. The result of a global calibration does matter: if for some reason the calibration output get corrupted, the initial processing of the data taken while the calibration parameters are valid will be bad. So the data will need to be reprocessed after that the validity of a good calibration would have been extended to cover the bad time range. This may take weeks as runs are normally processed in the order they are taken. Fortunately, the DRC calibrations are stable over quite long periods and so this fix is harmless.

Checking the last global calibration is very easy.

  1. Open a session as babardrc on a fast IR2 machine, for instance bbr-dev102.
    ssh -X babardrc@bbr-dev102

  2. Go in the proper directory:
    cd $drc/newDrcNfs/

  3. Run the following automated script
    The output postscript file is written in the directory /nfs/bbr-nfs03/det/drc/drc/tmp_central/. Its generic name is currentGlobalCalib_<date>_<time>.ps where the date (in the format YYYYMMDD) and time (format HHMMSS) labels allow one to identify which calibration was used to produce which set of monitoring plots.

  4. Check the plots!
    An example can be found here. The main things to know and to check are the following.

  5. Email babardrc@slac.stanford.edu telling the status of the calibration.

Examples of unusual calibration plots (good or bad, check them carefully!) can be found here.

As the runs get 'PC-processed' a few hours after the data were taken in IR2, it is important to check the quality of a calibration as early as possible. Therefore, an automated e-mail is sent to babardrc each time a new (DIRC) global calibration has been taken.

Additional note: The alias lastGlobalCalibration (available when logged on as babardrc) does steps 2., 3. and part of step 4. (it brings you to the output directory) in a row. Then one just needs to open the most recent .ps file and to check its data.

When trying to validate a calibration, one gets sometimes a message saying:

Last global calibration could not be validated. (...) Current DIRC offline-online release XX.X.X doesn't match production offline YY.Y.Y

This is not a problem: it means that the release used for the online production has been updated and that it doesn't match the DIRC online release anymore. To have the calibration validation working again, one just needs to update the DIRC framework.
Currently, the way to do this is by running the following script from the $drc/newDrcNfs/ directory:
This operation should be done by the operations manager not by the commissioners.

Monitoring the time evolution of DIRC calibrations

In case of a problem with the DIRC data processing or after a long period without data taking during which some online-related work was done, monitoring the time evolution of DIRC calibration data over the last weeks is a good idea.
Indeed, outputs of DIRC calibrations are expected to be very stable and so any unexpected variation is likely to trigger a problem -- or to reflect some change in the hardware, for instance a DFB replacement. In the latter case, a new working point should have been reached: check this assumption by taking a few more calibrations. Their data should be stable again.

The recipe to make such time-evolution plots is quite simple.

  1. Log in to bbr-dev20) as babardrc:
    ssh -X babardrc@bbr-dev20

  2. Setup the release and go to the working directory:
    cd $drc/newDrcNfs/DrcCommissioner
    srtpath Choose SunOS58_sparc_WS6U1 as BFARCH (not the default so far)
    ambientboot ← use ir2boot only if you want to include recent calibrations (less than one day old) in the survey.
    cd workdir
    Troubleshooting: DO NOT use ir2boot to run on long time ranges. While the job would proceed, the DIRC 'part' of the database would be locked which means for instance that no calibration data could be written.
  3. Produce the time evolution of the calibrations in the time range you're interested in.
    For instance, to include all calibrations between June 15th and June 30th 2005, launch the command:
    runTdcHistory.csh 2005-06-15_00:00:00 2005-07-01_00:00:00 0
    Its last argument is the minimum number of hours between two consecutive calibrations taken into account in the history plot. By setting it at 0 one is sure not to miss any calibration.
    In fact, the macro slightly adapts the range defined by the user by adding/removing a few hours. Therefore, to avoid getting annoyed by this feature, add one extra day before and after the range you are interested in.
    The output of this command can be found here: the calibration from June 12th has been included in the history, an example of the feature described above.
    Keep this feature in mind when you analyze the postscript output of the command: the plot origin is not the time you specified but the time of the previous calibration!
  4. The output of the command is a postscript file:
    All plots should be pretty flat apart in sector #5 which is usually a bit 'messy' (until the October 2005 shutdown, sector 10 was also messy but this was due to an hardware problem which has been fixed).

Finding and Masking a noisy electronics channel

To find the location of a noisy channel:
Open paw with from your home directory:
Then inside paw use the following commands:
h/file 1 /nfs/bbr-nfs102/pubfastmon/Monitoring/OutputArchive/2007/03/LiveFastMon/LiveFastMon-0071363-20070321-115817.hbook 0
where LiveFastMon-0071363-20070321-115817.hbook corresponds to the RUN you want use.
cd drcfm
which will list all the histograms
set ncol 50
palette 1
op logz
h/pl 45 colz
where 45 is the 2-D histogram correspoding to the appropiate sector. The noisy pmt will show as a hot bin in this histogram, maybe 100 or more times hotter than the average pmt.
exec ~babardrc/kumac/drawSector_FM.kumac
which allows you to get the coordinates of the noisy channel when you click on the channel bin on the plot
to exit.

To mask the noisy channel:
There are two new scripts that make the jobs much easier:
~hadig/babar/dirc/maskedchannels.pl key_date

to find the list of channels masked in the given key and
~hadig/babar/dirc/maskchannel.pl old_key_date sector dfb channel new_key_date

to mask an addition channel.

Things to know before following the instructions:

Terminology of the DIRC geometry and basics of the readout.
This includes the terms: ROM, sector, harness, channel, TDC, and DFB. See here for details.
Which channel is noisy (sector, row, column) ?
To get this information, do a standalone run and look at the sector plane:
n/pl 2.row%column sector.eq.# option=colz
with # replaced by the number of the noisy sector. Please make sure that you get the row and column number in the format starting at 0. To check plot:
n/pl 2.row%column sector.eq.#.and.(row.ne.#.or.column.ne.#) option=colz
with the #'s replaced by the corresponding numbers. The noisy PMT should no longer be visible, but a white square should appear at its coordinates.
Is it electronics noise or a noisy PMT ?
If the neighboring PMTs see light from the noisy PMT, it is a X-mas tree and not a noisy tube. Otherwise, switch off the HV for the corresponding HV group and make another standalone run and check whether the PMT is still hot. In case it is a PMT related problem, try to lower the voltages in order to check whether you can save the PMT, otherwise, disconnect the HV cable from the PMT (see other texts for more information).

Gathering the information
Note that hexadecimal numbers are prepended with an 0x in this text. In the ASCII version of the xtc file that you will edit, all values are entered in hexadecimal format WITHOUT the leading 0x.

We now have the sector, row, and column, of the PMT. Next, we need the ROM, link, harness, channel, section, TDC, and TDC channel information.
The following table converts sector to ROM and link:

Sector ROM Link
In order to convert the row and column to harness and channel, run the program
Select option 2 and enter the column and row numbers. The DFB number is the same as the harness number.

Get the section number using the following table:

Harness Section if Link==A Section if Link==B
4 923
5 822
6 721
7 620
8 519
9 418
10 317
11 216
12 115
13 014

We only need the section number modulo 14, i.e. note the number in the second column.

Get the TDC information by:
TDC number : channel / 16 (number from 0 to 3)
TDC channel : channel modulo 16 (number from 0 to 15)

Look for the current xtc file. You should ask the Configuration specialist (Vasia) about the current xtc files. You are likely to find those in:

Please note that you should never change or delete those files as they are part of the current configuration and if we loose those, DIRC will go non-runnable.

Find the correct xtc file for the ROM you want to change, it should be called Drc0#_DATE.xtc with # replaced by the ROM number (0-5).
Convert the file into a human readable format by running:

TestDrcRegisters filename.xtc > test.dat
Open the file test.dat in your favorite editor. The format is line oriented. The columns have the following meanings:

Column Description Values
0 Group 0 : data taking
1 : calibration
2 : internal test
1 Address 0-7: ADC
0x8-0xf: ANDer
0x10 and up: TDC
2 Value 0-0xffff
3 Link A Mask 0-0xfffc
4 Link B Mask 0-0xfffc

More detail on all the fields, can be found here.

We are only interested in the Group 0. The channel will be masked in the ANDer (in theory we can also mask it in the TDC only but this will leave the ADC for this channel switched on). The Address values for masking are:

TDC number Address

Look for the lines in the text that are Group 0 and the Address value you determined in the table above. A typical line (without any masked channels) will look as follows:

0 b ffff fffc fffc

Please note that 0xfffc stands for the binary number %1111 1111 1111 1100, i.e. the upper 14 bits are set, the lower 2 not. Correspondingly, 0xffff stands for the binary number %1111 1111 1111 1111, i.e. all 16 bits are set.
Remember also that Link A and Link B stand for one full Front-End-Crate with 14 DFBs.

This line will cause the following configuration to be set:
In Link A all upper 14 bits are set. Therefore, the initialization is sent to all 14 DFBs. For Link B, all upper 14 bits are set to abd the initialization valid for those 14 DFBs, too. The Address 0xb tells us that the Value is set in the registers of the second TDC (number 1) on those boards.
The value itself is 0xffff, i.e. all 16 channels on that TDC are enabled.

Lets assume you want to switch off TDC channel 7 on the TDC number 2 on Link A section 5. This means that all TDC channels BUT TDC channel 7 have to be switched on for that TDC.
Lets assume the old line is:

0 d ffff fffc fffc

Thus, the value will be 0xffff - 2^7, i.e. all bits set but the 8th: %1111 1111 0111 1111 = 0xff7f.
The Link B Mask should be 0, as none of the Link B DFB/TDCs should get this value. The Link A Mask should only contain the bit for the TDC on section 5. Remember that the bits are shifted by two, i.e. 2^(5+2) = 0x80.
The other TDCs should still be set to 0xffff, the mask for Link B is unchanged, the one for Link A is the old value minus the new Link A mask calculated in the last step.

Now you can replace the old line by the following new lines:

0 d ffff ff7c fffc
0 d ff7f 0080 0

Before converting the file back into xtc format, make sure to do the following:

Convert the ASCII file back to the new xtc file by running the command:

TestDrcRegisters < test.dat

It is best to check that the translation was successfull by reconverting the new xtc file into an ASCII file and making a diff of the two files.

In order to make the changes offical, Vasia has to create a new DIRC key which has then to be included in a new BaBar key. Once data taking starts with this key, the masking is effective.

It is not recommended, but possible, to change the DIRC xtc file currently in use. In this case, the change will get used as soon as the shift leader goes to 'STANDBY' to allow a reconfiguration of the system. If you have to do this, make a backup copy of the original xtc file so that you can back out your changes in case of unexpected problems with the new key.

How to mask DFBs in the ROMs

For instructions with some pictures, see here.

Rebooting the DIRC ROMs

Please don't forget that the ROMs should not be rebooted 'just for fun'
  1. Log in to a subnet 60 machine
    ssh bbr-farm02

  2. Set some basics:
    setenv ODF_PLATFORM 127

  3. Reboot the DIRC ROMs
    /nfs/bbr-srv02/dataflow/ir-2/drc/release/bin/SunOS58_sparc_WS6U1/rebootPartition -c 0x1c0000

How to use the Macintosh in the test-stand

For instructions with some pictures, see here.

How to recover a failed HV supply

For instructions with some pictures, see here.

Replacing a CAEN HV mainframe

Detailed instructions with some pictures can be found in the above section.

Make sure that the main frame has a problem. In order to do that, do the following tests: If the crate needs to be replaced, go to the previous section of the manual and follow carefully the instructions.

Replacing a CAEN HV board

Changing a HV board is easy provided that you follow the non-routine JHAM guidances and that you're familiar with the HV hardware which is described in the previous section.

Troubleshooting: After each HV replacement, check the nominal HV values of the corresponding channels and, if needed, reload them.

Spare HV boards are stored in our teststand upstairs in IR2. Don't forget to bring the faulty board(s) in Paul Stiles' workshop... and to bug him afterwards to make sure the repair is quick!

The main steps of the HV board change procedure are recalled below.

Special case: failure of the 4th board in a sector.
In each sector, the 4th (from the left looking at the back of the crates) board has a particular status. It is only powering 8 HV channels (hence 128 PMTs) instead of 16 for the other 3 boards. In addition, these PMTs are located in the outermost part of the sector (see for example the failure of sector 4 4th board on 2006/06/30) where very few tracks have their Cerenkov ring measured.
A 55' run taken with the sector 4 4th HV board dead on the swing shift of 2006/06/30 has been DQG-ed OK which means that changing that board can be delayed (for instance up to the next beam loss). On the other hand, a failure of the first board in sector 1 in July 2005 lead to data declared bad by the PID group. Hence, In the latter case, be very cautious: check quickly the FM plots for each run to make sure that only the same 8 channels are dead; get in touch with the DIRC DQ expert to check that the PC (ER) processing of these runs is OK; be ready to change the board anytime -- 2 or 3 (better) people needed. Obviously, if you have a doubt on the quality of the data, do not hesitate: just change the board!

Setting the default voltages for the DIRC HV

After having changed a HV board, one needs to set the injectable (V1) and runnable (V0) voltages of all its channel. The simplest way to do this is to use the burtwb tool. It reads a text file containing the voltage settings for all 672 DIRC HV channels and writes them in the 48 DIRC HV boards. The recipe to use this tool is detailled below.

  1. Switch off all HV crates in EPICS, but leave them on in EH.

  2. Log in to a SUN machine which has write permission in the CAEN crates, e.g. bbr-refsun.
    ssh -l babardrc bbr-refsun

  3. Go to the directory where the HV setting files are stored.
    cd /nfs/bbr-srv01/u1/babar/boot/apps/drc-hv/burt/

  4. Load the HV setting files
    ~vasileia/bin/burtwb -f nominalV0_20071120_final.snap for V0 (runnable) HV values
    ~vasileia/bin/burtwb -f nominalV1_20071120_final.snap for V1 (injectable) HV values
    and load the trip thresholds
    ~vasileia/bin/burtwb -f nominalITrip_20071120_final.snap
    These two files containt the current default HV settings. There should be no error message. Sometimes, the write command fails and gives error messages. Simply retry the burtwb until it works.

  5. Check in EPICS that the V0WR and V1WR fields are filled and have sensible values: for all channels, V0WR - V1WR should be 300 V (except for channel in each sector which is the scaler) and the default runnable voltages for all channels can be found here. The old values (before Nov. 2007) can be found here here.

  6. Switch ON the HV. check that the V0RD values are equal to the V0WR settings. The physical voltages applied on the HV channels are given by the VMON voltages. When the DIRC is runnable, these values should be very close to the V0RD values (a difference of 1-2 volts in some channels is not a problem).

Practically, the switch between the two voltage levels is made through the SIAM #2 (note the right-most SIAM has been moved to another slot. See here for an up-to-date picture of the location of the siams in the. drc-mon crate) which can either be 'on trip' (corresponding to the runnable voltage level V0) or 'OK' (injectable voltage level: V1 = V0 - 300 V). Hence, as stated on a post-it glued on the SIAM in the E.H., having this SIAM tripped during data taking is normal.

SIAM 2 used to set the DIRC HV to V0 (SIAM tripped) or V1 (SIAM not tripped). So, in normal operations, this SIAM looks like in trip mode but this is normal!

Investigating finisar problems

For instructions with some pictures, see here.

Investigating and fixing chiller problems

For instructions with some pictures, see here.

Investigating Wiener crate problems

For instructions with some pictures, see here.

Replacing a DFB or DCC

Remember that failure of a single DFB is not reason enough to open the backward doors!

Turn off all the DIRC HV and the power to the Wiener Crate where the DFB (DCC) is to be replaced before starting work.

Get a small flathead screwdriver (in teststand drawer) and a replacement DFB or DCC which has be recently tested on the teststand to insure it is working well. A ladder is required to access the crates on the side of the DIRC and the bridge is required to access the upper crates. After unscrewing the DFB to be replaced, remove it very carefully - the small yellow capacitors on the back are easily knocked off. (DCCs also require care, but are not right next any other boards.) Be sure the new DFB/DCC is correctly aligned in the tracks before pushing it in.DCCs require more force to push in at the end.

After successful replacement, it is necessary to take 2 calibrations to check that the replacement was a success. Inform anyone working near the DIRC that you plan to turn the HV on before doing so.

Please test the broken DFB (DCC) in the teststand if possible to check if the brokenness is reproducible. After testing, send the board to the appropriate place (usually France) for repair.

After completing the replacement of a DFB or DCC there are 5 files to update:

Spare Status
SLAC IDs for DIRC Boards
Boards Currently in the Detector
Board History
Troubled Slot History at (/BFROOT/www/Detector/DIRC/Operations/troubled_slot_history.xls)

Finally one needs to update the gains on the DFBs. This is done by following the instructions in the README file which is located at:

Replacing a Wiener crate fan tray

For instructions with some pictures, see here.

Replacing a Wiener crate power supply

For instructions with some pictures, see here.

A DIRC Water Plant Digest for Commissionners

For instructions with some pictures, see here.

Procedure to be followed after a SOB dump

For instructions with some pictures, see here.

Restarting the SOB circulating pump

For instructions with some pictures, see here.

Restarting the SOB degasing pump

For instructions with some pictures, see here.

Rebooting the DIRC IOCs

In the following, the word 'IOC' is used to indicate one of the three hardware IOCs the DIRC has been using since the beginning of BaBar: drc-mon, drc-hv and drc-gas. Since the summer 2005, the DIRC has a fourth IOC, drc-soft, which is purely software.

Completely independent from the data taking, drc-soft is mainly used to monitor the DIRC background. Its reboot procedure is different from the methods which are described in the core of this section.
Rebooting drc-soft: From a con-01 terminal (one needs to be logged as babar to execute this reboot), go to the directory /nfs/bbr-srv01/u1/babar/boot/apps/drc-soft/boot/. There, run the command
source restartCommand.csh
The reboot should take about 20 seconds during which the ALH variables of the DRC_BACKGROUND section are disconnected for a short while.

Never reboot an IOC during a run if this is not necessary. Indeed, if the DAQ system is not able to reach the IOC for 2 minutes, a proxy will go non-runnable, interrupting the data taking. This is unfortunated because rebooting a DIRC IOC would be harmless otherwise. However, this is a BaBar policy which we have not been able to change.

There are several ways to reboot an IOC. The preferred ones are those which preserve the IOC logfile which can then be analyzed if the reboot fails. IOC logfiles can be found in the area /nfs/bbr-nfs01/logfiles/Odc. The current logfiles can be found in the curr/ directory (one file per IOC, having the same name as the IOC). Logfiles of the 7 previous days are archived in the directories prev1/... prev7/. Older logfiles may be restored upon request.

IOC reboot through epics: (Recommanded procedure)

IOC reboot using a serial line connection (xyplex):

Troubleshooting: For security reasons, the access to all IOCs has been restricted on August 12th 2005. Therefore, serial line connections (xyplex) can now only be done from a limited number of machines: bbr-reflin (Scientific Linux) and bbr-refsun (SUN). By default, users are not allowed to log in these machines. If you think you need such permission for DIRC-related activities, please send an e-mail justifying your request to ir2-admin with the DIRC ops. manager(s) in cc. Otherwise, you can connect to these machines using the DIRC generic account babardrc.

How to check if the reboot is proceeding well?
First, most of the boot errors generate messages which are obviously triggering errors even if their precise meaning may be quite obscure. When a database file (generic path db/<fileName>.db) is successfully loaded, the logfile should show the following three lines:

load data
dbloadRecord "db/<fileName>.db"
Later in the logfile, you may also look for the following two lines
ecrit data 1 et valid=ffffff
If you have any doubt on the IOC behavior, contact the DIRC epics expert or discuss with someone from the IR2 computing group (Matthias or Steffen).

DIRC N2 system in a nutshell

For information and pictures, see here.

Investigating light generator crate problems

For information and pictures, see here.

How to produce a Backgrounds plot

This kind of plot:

can be obtained this way:
cd /nfs/bbr-nfs03/det/drc/drc/BackgroundMonitor/DrcBackgroundMonitor

Then do
source standalonePlots.csh 200701230 200702282 ParallelFeb07 180 YES kFALSE kFALSE

where 200701230 is the initial date in this format: YYYYMMDDS
where S is the shift (0=owl, 1=day, 2=swing)
ParallelFeb07 is a title for the plot file name.

All the other parameters, you can understand them by looking at the perl script.
It produces lots of files, stored in the directory

do ls -lrt on this directory to see which were the plots which were produced.
The job can take several minutes.

How to update the ROM files for noisy channels and new DFB Gains
Just cut-and-past these comands being careful to change everything that needs to be updated (e.g. release number,etc):
Create an updated release:
ssh benitezj@bbr-dev100
newrel -s $BFROOT/build/b/benitezj -t -o 17.2.0 JoseNew_17.2.0
echo "FD_NUMBER = 7594" > .bbobjy
gmake all
addpkg workdir
gmake workdir.setup
Copy old ROM files into new release:
cp -R OldRelease/workdir/REGISTERS JoseNew_17.2.0/workdir/.
cp ROM0_20071026.dat ROM0_20080110.dat
Check which channels are currently masked:
ssh benitezj@bbr-dev20
cd /nfs/bbr-srv02/dataflow/rdf/Drc/FE
/nfs/bbr-nfs03/detector/drc/test_JK_16.4.0/DIRCscripts/maskedchannels.pl 10262007
Edit the rom files:
cd /nfs/bbr-nfs03/detector/drc/JoseNew_17.2.0/workdir/REGISTERS
emacs ROM*.dat
Create .xtc files:
ssh benitezj@bbr-dev20
cd /nfs/bbr-nfs03/detector/drc/JoseNew_17.2.0/workdir/REGISTERS
/nfs/bbr-srv02/dataflow/rdf/Drc/FE/TestDrcRegisters < ROM0_20080110.dat
Copy the .xtc files into the production area:
su babardrc
cd /nfs/bbr-nfs03/detector/drc/JoseNew_17.2.0/workdir/REGISTERS
cp Drc00_01102008.xtc /nfs/bbr-srv02/dataflow/rdf/Drc/FE/.
Create file identifiers for each file:
cd /nfs/bbr-nfs03/detector/drc/JoseNew_17.2.0
source /nfs/bbr-nfs03/det/drc/drc/ir2_setup.src 17.2.0
cd /nfs/bbr-srv02/dataflow/rdf
createFileIdentifier -c -a /3/0/0/0/0 -d "ROM0-10Jan08 masks" Drc DrcRegisters FE/Drc00_01102008.xtc
(in this last line the red colored numbers indicates that this # needs to be changed for each rom.
cd Drc
su babardrc
cp new_rom.alias new_rom.alias_JB01102008
emacs new_rom.alias
to update the numbers.
Create New Keys:
ssh benitezj@bbr-dev100
cd /nfs/bbr-nfs03/detector/drc/JoseNew_17.2.0
source /nfs/bbr-nfs03/det/drc/drc/ir2_setup.src 17.2.0
cd /nfs/bbr-srv02/dataflow/rdf/Drc
CfgUtils -v EditAlias -f new_rom.alias drc
CfgUtils -v UpdateTree -d "new register files" drc
Be careful with this last step because it locks some database, try to do it when not taking colliding beam data. (Im not sure of this last statement).
----Call Pilot to end the run, refresh run type list and start a new run----

Some useful links

DIRC offline software

DIRC Reconstruction

Created 11-27-99, by Andreas Hoecker, modifications by: Joe
Major modifications: December 2005, Nicolas
Last modified: Thu Apr 26 08:20:59 PDT 2007 (Nicolas)
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