SLAC PEP-II
BABAR
SLAC<->RAL
Babar logo
HEPIC E,S & H Databases PDG HEP preprints
Organization Detector Computing Physics Documentation
Personnel Glossary Sitemap Search Hypernews
Unwrap page!
Det. Search
Who's who?
Meetings
FAQ
Images
Archive
Systems
Performance
Intern. region
Vertex Tracker
Drift chamber
DIRC
Calorimeter
IFR
LST
Magnet
Electronics
Trigger
Operations
Run Coordination
Contact Experts
Shift Takers Info
Operations Manual
Electronic Logbook
Ops Hypernews
Shift Signup
Check this page for HTML 4.01 Transitional compliance with the
W3C Validator
(More checks...)

  Trouble shooting for the DIRC

Down on this page you find a description of the hardware setup.

The actual status of the hardware is shown in the following page.


The structure of the system:

        -  module         (     6 modules; 0 - 5 )
        -  sector           (  12 sectors; 2 adjacent sectors per module)
        -  harness       (  14 DFB boards (harnesses) per sector)
        - TDC chip      (    4 TDC chips per  DFB board (harness); 16 channels per chip)
        -  phototube   (896 tubes per sector)
        -  HV group    (  56 HV groups per sector)
 

For sector 0 the   DFB mapping (harness)      and the      HV grouping   are shown here:
(this mapping is the same for all sectors)


 



 

1) Basic system failures:

  • Failure of high voltage
            - trip of an high voltage crate affects two adjacent sectors
               one should see this immediately in the occupancy plot and in the TDC-hits/sector plot

                -  loss of high voltage connection

                -  single dead channels
               the following channels have been removed on purpose:
 
 

  • Failure of DFB boards


2) Malfunctions :

            -  high voltage group noisy
                 (christmas tree problem)

            -  DFB crate noisy (harness)
            -  single channel noisy
            -

3) High background level :
 


Stefan Spanier <spanier@slac.stanford.edu>

Last modified: Thu May 13 13:14:15 PDT 1999