ALICE Calibration Requirements |
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TOF 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 |
Offline
(refined) Calibration |
6 floats |
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3.84E+06 |
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Month |
Physics
data - ESDs |
Yes |
Physics Events |
1e7-1e8 pp events |
event |
Offline/OCDB |
Yes |
Yes |
- |
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2 |
Rough TDC channel equalization |
1 short int |
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3.20E+05 |
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Run |
DAQ
(Online Calibration) |
Yes |
Physics Events |
1e6-1e7 pp events |
event |
DAQ FES/OCDB |
Yes |
Yes |
1 |
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3 |
TDC channel’s operating status |
1 char |
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1.60E+05 |
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Run |
DCS (from
pulser data taken outside physics runs and DCS Config DB) |
Yes |
monitor runs |
Run |
- |
DCS FES/OCDB |
Yes |
Yes |
4 |
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4 |
HV (Voltage) |
O(10floats)+1 short int |
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7.60E+03 |
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Run |
DCS Archive DB |
Yes |
- |
minute |
- |
DCS
ArchiveDB/OCDB |
Yes |
- |
4 |
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5 |
HV (Current) |
O(10floats)+1 short int |
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7.60E+03 |
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Run |
DCS Archive DB |
Yes |
- |
minute |
- |
DCS
ArchiveDB/OCDB |
Yes |
- |
4 |
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6 |
LV channels (Voltage) |
O(10floats)+1 short int |
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3.33E+04 |
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Run |
DCS Archive DB |
Yes |
- |
minute |
- |
DCS
ArchiveDB/OCDB |
Yes |
- |
4 |
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7 |
LV channels (Current) |
O(10floats)+1 short int |
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3.33E+04 |
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Run |
DCS Archive DB |
Yes |
- |
minute |
- |
DCS
ArchiveDB/OCDB |
Yes |
- |
4 |
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8 |
FEE Thresholds |
O(10floats)+1 short int |
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4.84E+04 |
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Run |
DCS Archive DB |
Yes |
- |
minute |
- |
DCS
ArchiveDB/OCDB |
Yes |
- |
4 |
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9 |
FEE Temperatures |
O(10floats)+1 short int |
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3.27E+05 |
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Run |
DCS Archive DB |
Yes |
- |
minute |
- |
DCS
ArchiveDB/OCDB |
Yes |
- |
4 |
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10 |
Temperature
(Env.) |
3 floats (2-par fit+max
excursion) |
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12 |
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Run |
DCS Archive DB |
Yes |
- |
minute |
- |
DCS
ArchiveDB/OCDB |
Yes |
- |
4 |
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11 |
Atmospheric Pressure |
3 floats(2-par fit+max
excursion) |
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12 |
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Run |
DCS Archive DB |
Yes |
- |
minute |
- |
DCS
ArchiveDB/OCDB |
Yes |
- |
4 |
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7E6-11E6 |
4.78E+06 |
0.00E+00 |
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Comments: |
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Parameter 1,2,3 only are needed in a fit approximation for
calibration. The other parameters will be kept for offline monitoring and
could eventually be used for calibration |
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Item 2: We would like to have the data used to
calculate the delays (root file containing 160K histograms, size is about
60MB) to be optionally archived as "reference data". |
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Item
3: status
word for each TOF TDC channel. In particular, the map of dead channel from pulser data is needed . This info is not monitored in the
DCS Archive but saved in our "local" DCS, and the
mechanism to make it accessible to the SHUTTLE has to be defined .
Moreover, we would like to keep track of channels being switched off in the
read-out (because noisy, for ex.) This info is stored in the DCS config
DB, which is not accessible by t he
shuttle as well . |
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Items 4-8: Here we foresee to
store a maximum of 5 couples of floats
(Value of the monitored quantity,Timestamp) corresponding to changes of the monitored parameter by a
significant amount during the run. |
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