It is always useful to print a monitoring display and you are encouraged to do so to help the expert in case of problem.
Each display has a "PRINT" button somewhere on the top of the display. If you click on it, the printout will be sent to the zanzibar printer in IR-2. If you want to send your printout to another printer follow this procedure. Click on it with the right button of your mouse and this window will come up:
Enter the printer name (zanzibar for IR-2) in the "Printer Name" field
and click OK. Then click the Print button on the display again, but with
the left button of your mouse this time to print the display.
A "CLOSE" or "EXIT" button is always present somewhere on the top right of the display. This will only close this window. To kill completely the monitoring, use the close button of the main EMC display. The color of the button is always pink.
Some displays have a HELP button implemented. By clicking on this button you start a simple Web browser which should point to help files. At the moment this feature is only available for the Interlocks. The best source of information about the monitoring being this document.
The display is separated in different areas corresponding to different
pieces of the detector. For each of these parts there is an overall
status displayed as a colored box. The color coding follows regular conventions
(Green is OK, Yellow is Warning and Red is Alarm). For each part a
relevant quantity is averaged and displayed. A
"beige" button gives access to more detailed displays. By clicking on the button with the
left button of your mouse you will activate
the default display for this partition. By clicking on the right button
of your mouse on the contrary, you will see a selection menu coming up
where you can choose from different sub-displays.
In the Barrel EMC, only 7 out of 8 blocks along the barrel are
equiped with temperature sensors. This is the reason why some of the rectangles
on the Temperature map are empty. In each quadrant we also have 4 measurements
of the temperature of the End Flanges, 2 on the front and 2 on the back.
Those are close to the Front End electronics and are sensible to both the
Fluorinert cooling of the crystals and the water cooling of the electronics.
The temperature observed on the end flange is generally a bit higher than
the one measured on the crystals.
In the past we have experienced the following problems:
The End Cap has 20 sectors. Each sector has 5 temperature sensors. The
display shows only the average temperature per sector. One of the lower
west sector has no temperature reading at all due to some mix up in the
wiring inside the end cap calorimeter itself.
In the past we have experienced the following problems:
Displays for Barrel Backward and End Cap are similar to the one shown here.
This panel shows the status of the diode bias voltage for the entire
EMC. It also allows you to change the settings and turn ON or OFF the voltage
for each channel individually or for all the channels (bottom raw labelled
- on/off turns on or off the channel.
- Stat describes the status ( can be ON,OFF,RUP(ramping up),RDN (ramping down), OVC (over current), OVV (over voltage), TRP (tripped)
-VXRD Maximum voltage allowed before channel trips
-VXWR maximum voltage setting entry
-Vmon measured voltage
-V0RD voltage set point *10
-V0WR voltage setting entry *10
-RURD ramp up setting.
-RUWR ramp up setting entry
-RDRD ramp down setting
-RDWR ramp down setting entry
-Imon monitored current in microA
-IORD maximum allowed current in micro A
-IOWR maximum current setting entry in microA
-TripRD trip dead band in 0.1 seconds unit
-TripWR trip dead band setting entry in 0.1 second unit
The correct setting are the ones displayed on the screen.
Several quantities are monitored for the Front End Electronics:
- I(+5V) current drawn by the +5V line
- V(-5V) voltage supply -5V
- I(-5V) current on the -5V line
- I(+10V) current on the 10V line
- T(PS) power supply temperature. This is the temperature measured on the power supply inside the
electronics house. Each display also shows the relevant information for the corresponding TRB (transition board).
The IOB/MB stat button will start a technical display that shows the freshness code update for all the GMB involved.
This is very useful if you want to know if the monitoring is still working. If this is the case the freshness code is updated every 5/6 seconds.
There are only 10 TRB in total on the detector: 2 for the End Cap, 4 for Barrel Forward and 4 for Barrel Backward. The information for each TRB are grouped into one single display. As for the front end electronics Low voltage monitoring we monitor currents, voltages and Power supply temperatures.
The radiation monitors also known as RadFet are read using a modified version of the GMB called RMB (of course). I don't know exactly how the radFet works, but I believe it is some kind of transistor which has a bias voltage setting. For more precision ask Adrian Mc Kemy X4111. If I have some time i'll describe briefly here how they work. The only important thing to remember is that we read Voltages and that's what we display at the moment. Later on we will convert those voltage into radiation doses and display them in a more comprehensible way. At the moment this display is only useful for experts. The TRIG button on the display allows you to manually trigger the board reading. This board is read only every minute or so. If you want to check that it's still connected you can trigger the reading and watch the voltages being updated on the screen as well as the Freshness code that we have kept in Hexadecimal notation just for fun.
If you didn't know yet, the Barrel is flushed with dry nitrogen in an attempt to keep the crystals dry enough so that they don't dissolve which would be unfortunate. Since some of our fellow sub detectors have water cooling somewhere in the detector one is never prudent enough. Experience has proven it already. In case of Water leak Humidity should dramatically increase whereas the oxygen level also measured should remain rather low. If however both are rising, it is possible that the leak is in the Nitrogen piping more than a water leak. As for the other monitored quantities, alarm limits have been defined.
And it is linked to the main panel: