ALICE Calibration Requirements  
 
 
   
PHOS OK July 06  
 
Par # Parameter Data format/size per channel Data size (Total) Bytes Update freq Source confirmed  Run type / Trigger type # of required events/sampling rate Processing level: sub-event or event Results: FEE/Archive Accessible by offline Calib. Procedure in AliRoot use case #
    on FES in OCDB reference                                      
1 EMCal: pedestal histograms TH1I (872 bytes)   0 14 Mb Run HLT or DAQ Oct.2006 special pedestal run 1000 events sub-event DAQ or HLT FES/OCDB Yes Oct.2006 5 or 2                                  
2 EMCal: energy calibrations for low and high gains 2 floats   1.40E+05 0 Run HLT and Offline yes physics run 1e+06 pp events sub-event HLT FES/OCDB Yes Yes 2                                  
3 LED average amplitude 1 float   7.00E+04 0 Run HLT yes special LED run 10000 events sub-event HLT FES/OCDB   Oct.2006 2                                  
4 CPV pedestals and calibration  2 float   2.80E+05 0 Run HLT Mar.2007 physics run 1e+06 pp events sub-event HLT FES/OCDB Yes Yes 2                                  
5 EMCal: Bad/dead channel maps 1 bool   1.80E+04 0 Run HLT yes pedestal run, physics run 1000 events sub-event HLT FES/OCDB Yes Aug.2006 2                                  
6 CPV: Bad/dead channel maps 1 bool   3.60E+04 0 Run HLT yes pedestal run, physics run 1000 events sub-event HLT FES/OCDB Yes Aug.2006 2                                  
7 EMCal: HV values 1 char (0-255)   1.80E+04 0 1 month DCS Oct.2006 DCS monitored - - DCS ArchiveDB/OCDB Yes Mar.2007 unknown (5?)                                  
8 EMCal: Temperatures 1 float   10 0 Run DCS Oct.2006 DCS monitored - - DCS ArchiveDB/OCDB Yes Mar.2007 4                                  
9 CPV: high voltages 1 UShort_t   40 0 Run DCS Mar.2007 DCS monitored - - DCS ArchiveDB/OCDB Yes Mar.2007 4                                  
10 CPV: status of gas mixtures Unknown   Unknown 0 Run DCS Mar.2007 DCS monitored - - DCS ArchiveDB/OCDB Yes Mar.2007 4                                  
11 CPV: temperature 1 UShort_t   64 0 Run DCS Mar.2007 DCS monitored - - DCS ArchiveDB/OCDB Yes Mar.2007 4                                  
  5.62E+05 0.00E+00
  DCS access - offline has access only to DCS archive DB, curently no access to configuration DB
  DAQ - offline has access to raw data and DAQ logbook, but no acccess to LDC or GDC directly
  OCDB - Calibration parameters are stored in the Offline Calibration DB. The data used to calculate these parameters, the reference data, can also be optionally archived for later access from offline.
 
  Remarks:
  1) EMC pedestals will be filled into TH1I in the monitoring program at HLT, one entry persample. Pedestals will be fed to FEE and are not to be used in offline. Save as a reference is needed for a quality control.
  2) Source of EMCAL pedestal and zero-suppression is under discussion
  3) EMCAL HV values for each APD are manually inserted via DCS, not known where to find them back
  4) CPV LV and gas status are under discussion
  5) Calibration procedures for EMCAL and CPV calibration are available as macros using the full aliroot framework, need to be implemented as TTasks. To be done in Aug.2006
  6) Temperature in the EMC cold volume is stabilized to 0.1 degrees. If it is as stable as declared, we might omit calibration correction by the temperature.