SPD Calibration Requirements |
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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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in OCDB |
reference |
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1 |
List of
dead/noisy pixels and chips |
4 Bytes |
1.00E+07 |
2.00E+07 |
Whenever there is a ~30
minutes dead time (fill,…) the values are compared to previous ones and
updated if changes – Typical: weekly |
DCS/DAQ |
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Physics and
Calibration / CTP and DCS |
for
physics dead: 100 M @p-p and
100 K @Pb-Pb noisy: 100 K |
sub-event |
OCDB + Noisy in DCS-CDB |
yes |
yes |
1-3 |
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2 |
Threshold |
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4.00E+08 |
DCS/DAQ |
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Calibration / DCS |
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sub-event |
DCS-CDB |
no |
yes |
1-3 |
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3 |
Noise level |
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4.00E+08 |
DCS/DAQ |
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Calibration / DCS |
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sub-event |
DCS-CDB |
no |
yes |
1-3 |
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4 |
Uniformity of response |
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2.00E+07 |
DCS/DAQ |
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Calibration / DCS |
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sub-event |
DCS-CDB |
no |
yes |
1-3 |
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5 |
FO uniformity |
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2.00E+07 |
DCS/DAQ |
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Calibration / DCS |
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sub-event |
DCS-CDB |
no |
yes |
1-3 |
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6 |
Delays |
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4.00E+08 |
DCS/DAQ |
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Calibration / CTP |
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sub-event |
DCS-CDB |
no |
yes |
1-3 |
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7 |
Parameters
from general DAC scan |
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4.00E+08 |
DCS/DAQ |
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Calibration / DCS |
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sub-event |
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no |
yes |
1-3 |
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1.00E+07 |
1.66E+09 |
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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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