ALICE Calibration Requirements |
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PHOS OK July 06 |
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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 # |
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on FES |
in OCDB |
reference |
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1 |
EMCal:
pedestal histograms |
TH1I (872 bytes) |
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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 |
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2 |
EMCal:
energy calibrations for low and high gains |
2 floats |
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1.40E+05 |
0 |
Run |
HLT and
Offline |
yes |
physics run |
1e+06 pp events |
sub-event |
HLT FES/OCDB |
Yes |
Yes |
2 |
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3 |
LED average amplitude |
1 float |
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7.00E+04 |
0 |
Run |
HLT |
yes |
special LED run |
10000 events |
sub-event |
HLT FES/OCDB |
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Oct.2006 |
2 |
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4 |
CPV pedestals and
calibration |
2 float |
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2.80E+05 |
0 |
Run |
HLT |
Mar.2007 |
physics run |
1e+06 pp events |
sub-event |
HLT FES/OCDB |
Yes |
Yes |
2 |
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5 |
EMCal:
Bad/dead channel maps |
1 bool |
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1.80E+04 |
0 |
Run |
HLT |
yes |
pedestal run, physics run |
1000 events |
sub-event |
HLT FES/OCDB |
Yes |
Aug.2006 |
2 |
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6 |
CPV: Bad/dead channel maps |
1 bool |
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3.60E+04 |
0 |
Run |
HLT |
yes |
pedestal run, physics run |
1000 events |
sub-event |
HLT FES/OCDB |
Yes |
Aug.2006 |
2 |
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7 |
EMCal: HV
values |
1 char (0-255) |
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1.80E+04 |
0 |
1 month |
DCS |
Oct.2006 |
DCS monitored |
- |
- |
DCS
ArchiveDB/OCDB |
Yes |
Mar.2007 |
unknown (5?) |
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8 |
EMCal:
Temperatures |
1 float |
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10 |
0 |
Run |
DCS |
Oct.2006 |
DCS monitored |
- |
- |
DCS
ArchiveDB/OCDB |
Yes |
Mar.2007 |
4 |
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9 |
CPV: high voltages |
1 UShort_t |
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40 |
0 |
Run |
DCS |
Mar.2007 |
DCS monitored |
- |
- |
DCS
ArchiveDB/OCDB |
Yes |
Mar.2007 |
4 |
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10 |
CPV: status of gas mixtures |
Unknown |
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Unknown |
0 |
Run |
DCS |
Mar.2007 |
DCS monitored |
- |
- |
DCS
ArchiveDB/OCDB |
Yes |
Mar.2007 |
4 |
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11 |
CPV: temperature |
1 UShort_t |
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64 |
0 |
Run |
DCS |
Mar.2007 |
DCS monitored |
- |
- |
DCS
ArchiveDB/OCDB |
Yes |
Mar.2007 |
4 |
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5.62E+05 |
0.00E+00 |
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DCS access - offline has access
only to DCS archive DB, curently no access to configuration DB |
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DAQ - offline has access to raw
data and DAQ logbook, but no acccess to LDC or GDC directly |
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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. |
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Remarks: |
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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. |
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2) Source of EMCAL pedestal and
zero-suppression is under discussion |
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3) EMCAL HV values for each APD are
manually inserted via DCS, not known where to find them back |
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4) CPV LV and gas status are under
discussion |
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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 |
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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. |
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