ALICE Calibration Requirements |
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EMCAL OK October 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 |
pedestal for low gain |
TH1I (872 bytes) |
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1.40E+04 |
run |
HLT or DAQ/LDC |
not |
special pedestal run or physics
run |
10000 events |
sub-event |
DAQ or HLT FES/OCDB |
yes |
no |
1, 2, or 5 |
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2 |
pedestal for
high gain |
TH1I (872 bytes) |
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1.40E+04 |
run |
HLT or DAQ/LDC |
not |
special pedestal run or physics
run |
10000 events |
sub-event |
DAQ or HLT FES/OCDB |
yes |
no |
1, 2, or 5 |
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3 |
pedestal sigma
for low gain |
1 float |
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1.11E+05 |
run |
HLT or DAQ/LDC |
not |
special pedestal run or physics
run |
10000 events |
sub-event |
OCDB |
yes |
no |
1 or 2 |
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4 |
pedestal sigma
for high gain |
1 float |
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1.11E+05 |
run |
HLT or DAQ/LDC |
not |
special pedestal run or physics
run |
10000 events |
sub-event |
OCDB |
yes |
no |
1 or 2 |
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5 |
energy/ADC
channel for low gain from physics |
1 float |
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1.11E+05 |
1.11E+05 |
run |
HLT or DAQ/LDC |
not |
physics run |
1e+6 pp events |
sub-event |
DAQ or HLT FES/OCDB |
yes |
no |
1 or 2 |
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6 |
energy/ADC
channel for high gain from physics |
1 float |
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1.11E+05 |
1.11E+05 |
run |
HLT or DAQ/LDC |
not |
physics run |
1e+6 pp events |
sub-event |
DAQ or HLT FES/OCDB |
yes |
no |
1 or 2 |
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7 |
energy/ADC
channel for low gain from LED |
1 float |
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1.11E+05 |
1.11E+05 |
run, maybe more often |
HLT or DAQ/LDC |
not |
special LED run |
10000 events |
sub-event |
DAQ or HLT FES/OCDB |
yes |
no |
1 or 2 |
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8 |
energy/ADC
channel for high gain from LED |
1 float |
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1.11E+05 |
1.11E+05 |
run, maybe more often |
HLT or DAQ/LDC |
not |
special LED run |
10000 events |
sub-event |
DAQ or HLT FES/OCDB |
yes |
no |
1 or 2 |
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9 |
time walk
coefficient 1 for low gain |
1 float |
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1.11E+05 |
1.11E+05 |
year |
LDC? |
not |
calibration run during long beam
off periods |
10000 events |
sub-event |
DAQ or HLT FES/OCDB |
yes |
no |
1 or 2 |
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10 |
time walk
coefficient 2 for low gain |
1 float |
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1.11E+05 |
1.11E+05 |
year |
LDC? |
not |
calibration run during long beam
off periods |
10000 events |
sub-event |
DAQ or HLT FES/OCDB |
yes |
no |
1 or 2 |
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11 |
time walk
coefficient 3 for low gain |
1 float |
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1.11E+05 |
1.11E+05 |
year |
LDC? |
not |
calibration run during long beam
off periods |
10000 events |
sub-event |
DAQ or HLT FES/OCDB |
yes |
no |
1 or 2 |
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12 |
time walk
coefficient 1 for high gain |
1 float |
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1.11E+05 |
1.11E+05 |
year |
LDC? |
not |
calibration run during long beam
off periods |
10000 events |
sub-event |
DAQ or HLT FES/OCDB |
yes |
no |
1 or 2 |
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13 |
time walk
coefficient 2 for high gain |
1 float |
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1.11E+05 |
1.11E+05 |
year |
LDC? |
not |
calibration run during long beam
off periods |
10000 events |
sub-event |
DAQ or HLT FES/OCDB |
yes |
no |
1 or 2 |
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14 |
time walk
coefficient 3 for high gain |
1 float |
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1.11E+05 |
1.11E+05 |
year |
LDC? |
not |
calibration run during long beam
off periods |
10000 events |
sub-event |
DAQ or HLT FES/OCDB |
yes |
no |
1 or 2 |
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15 |
dead/hot
channel map |
1 integer |
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5.60E+04 |
5.60E+04 |
run |
HLT or DAQ/LDC |
not |
physics run, LED run |
10000 events |
sub-event |
HLT FES/OCDB |
yes |
no |
1 or 2 |
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16 |
high voltages
for APD |
1 float |
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1.11E+07 |
1.11E+07 |
daily |
DCS |
not |
always |
- |
- |
DCS Archive DB/OCDB |
yes |
no |
4 |
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17 |
Supermodule temperatures |
- |
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1.00E+03 |
1.00E+03 |
a few minutes |
DCS |
not |
always |
- |
- |
DCS Archive DB/OCDB |
yes |
no |
4 |
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Total sizer per run |
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1.23E+07 |
1.25E+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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Remarks: |
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1) Source of EMCAL pedestal and zero-suppression is under
discussion. |
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2) EMCAL HV values for each APD are manually inserted via DCS,
not known where to find them back. |
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3) LV is under discussion. |
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4) Calibration procedures for EMCAL
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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5) Number of
coefficients for obtaining peak ADC value is under discussion. |
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6)
There will be a number of temperature sensors on Supermodules. The number and location is under
discussion. |
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