ALICE Calibration Requirements |
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ITS SDD |
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Par # |
Parameter |
Data format/size
per channel |
Data size (Total) |
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 (see Note 3) |
use case # |
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on FES |
in OCDB |
reference |
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1 |
Low and
HighThresholds for CARLOS |
2x8 bits/sensor |
0 |
5.08E+02 |
0 |
Run |
DAQ (JTAG - It can be written
to a run header) |
yes |
Standard runs |
1 |
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OCDB |
Yes |
No |
5
/ Note 1 |
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2 |
Baselines |
9 bits/each PASCAL + 6
bits/anode on AMBRA |
0 |
9.98E+04 |
0 |
Run |
DAQ (JTAG - It can be written
to a run header) |
yes |
Standard runs |
1 |
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Note 1 |
Yes |
No (Base classes) |
5 / Note 1 |
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3 |
Noisy anodes (masked) |
512 bitmap: 512 bits/sensor |
1.64E+04 |
1.64E+04 |
0 |
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DAQ (JTAG - It can be written
to a run header) |
yes |
Standard runs |
1 |
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Note 1 |
Yes |
No |
5 / Note 1 |
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4 |
Noise amplitude |
4 bits/anode |
6.50E+04 |
6.50E+04 |
0 |
Run |
DAQ (data without 0 suppression
- dedicated runs) |
yes |
Dedicated run w/o 0 supp. |
~1000 |
sub-event |
OCDB |
Yes |
No (Base classes) |
1 |
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5 |
Pedestals |
8 bit/anode |
1.30E+05 |
1.30E+05 |
0 |
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DAQ (data without 0 suppression
- dedicated runs) |
yes |
Dedicated run w/o 0 supp. |
~1000 |
sub-event |
OCDB |
Yes |
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1 |
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6 |
Gains |
8 bits/anode |
1.30E+05 |
1.30E+05 |
0 |
Run |
DAQ (dedicated runs with S/W
triggers) |
yes |
Dedicated runs / SW trigger |
~1000 |
sub-event |
OCDB |
Yes |
No (Base classes) |
1 |
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7 |
Drift velocity |
1 word/anode |
1.04E+06 |
1.04E+06 |
0 |
Run |
DAQ (dedicated runs with S/W
triggers during standard running) |
yes |
Standard runs / special trigger
(injectors) |
every 10-15 minutes |
sub-event |
OCDB |
Yes |
No (Base classes) |
1 |
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8 |
Dopant concentration map |
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0 |
3.00E+07 |
0 |
Once |
DCDB |
yes |
Standard runs |
0 |
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OCDB |
Yes |
No |
Note 2 |
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9 |
External temperature monitor |
2x sensors + 1 x CARLOS |
0 |
1.46E+02 |
0 |
Run |
DCS |
yes |
Standard runs |
0 |
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OCDB |
No |
No |
4 |
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10 |
10--->8 bit compression |
unique for all channels (see
total) |
0 |
0.125 |
0 |
Run |
DAQ (JTAG - It can be written
to a run header) |
yes |
Standard runs |
1 |
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Note 1 |
Yes |
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5 / Note 1 |
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11 |
ADC readout clock (20/40 MHz) |
unique for all channels (see
total) |
0 |
0.125 |
0 |
Run |
DAQ (JTAG - It can be written
to a run header) |
yes |
Standard runs |
1 |
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Note 1 |
Yes |
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5 / Note 1 |
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12 |
Analogue memory sampling
frequency (20/40 MHz) |
unique for all channels (see
total) |
0 |
0.125 |
0 |
Run |
DAQ (JTAG - It can be written
to a run header) |
yes |
Standard runs |
1 |
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Note 1 |
Yes |
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5 / Note 1 |
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13 |
Detector polarizing voltage |
16 bit/sensor |
0 |
520 |
0 |
Run |
DCS |
yes |
Standard runs |
0 |
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OCDB |
yes |
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3.14E+07 |
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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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Note 1: Data fron FEE: they can be written in a run
header. So they do not need to be stored elsewhere |
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Note 2: maps are taken once for ever
from the construction DB |
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Note 3: Interface with shuttle is on
CVS. Specific preprocessor code is expected by end of April |
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