HCal Gain Calibration

Gain calibration constants have units [ADUc/pixel], where ADUc are ADC unit in calibration mode and a pixel is defined as the distance of two adjacent photo-electron peaks. The constants are made available in the database in folder

/cd_calice/Hcal/gain_constants 

These calibration parameters are temperature dependent. The slopes dGain/dT for each channel are stored in the database folder

/cd_calice/Hcal/gain_slopes 

Every entry gets tagged to allow permanent reference. Users are encouraged to use tags rather than the HEAD, i.e. make sure they know which assumptions are valid on the constants they use.

Tag description: gain_constants

Tag

Time / HV Period

Description

ahc_gain_constants_001

2006 - 2009

Gain values extracted from linear fit to CERN 2007 measurements and extrapolated to 0 degrees centigrade.

ahc_gain_constants_002

C06

same as ahc_gain_constants_001

C07

Average of all good gain measurements from this period, modules 1, 2, 14, 25 excluded (runlist_ahc_gain_constants_002_C07.txt). Modules 1, 2, 14, 25: Average of gain measurements from DESY re-calibration (runlist_ahc_gain_constants_002_C07_DESY_recalib.txt)

F08-1

Average of all good gain measurements from this period. runlist_ahc_gain_constants_002_F08-1.txt

F08-2

Average of all good gain measurements from this period. runlist_ahc_gain_constants_002_F08-2.txt

F08-3

Average of all good gain measurements from this period. runlist_ahc_gain_constants_002_F08-3.txt

F08-4

Average of all good gain measurements from this period. runlist_ahc_gain_constants_002_F08-4.txt (runs from 2009 are not used yet)

ahc_gain_constants_003

2006 - 2009

Same as ahc_gain_constants_001, added default value to collection (default = 400)

ahc_gain_constants_004

2006 - 2009

Same as ahc_gain_constants_002, added default value to collection (default = 400)

ahc_gain_constants_005

2006 - 2009

Same as ahc_gain_constants_004

C10

Values from C07

ahc_gain_constants_006

2006 - 2009

Same as ahc_gain_constants_004

C10

Values extracted by Clemens

C11

Values from C07

ahc_gain_constants_007

2006 - 2009

Same as ahc_gain_constants_004

C10

Same as ahc_gain_constants_006

C11

TODO: get the information from provider?

ahc_gain_constants_008

2006 - 2009

Same as ahc_gain_constants_004

C07

constants same as ahc_gain_constants_004, and the reference temperature has been corrected with Median Filter by Sergey

C10

Same as ahc_gain_constants_006

C11

Same as ahc_gain_constants_007, and extended, available for the whole year

Tag description: gain_slopes

Tag

Time / HV Period

Description

ahc_gain_slopes_001

2006 - 2009

Absolute slopes extracted from linear fit to CERN 2007 measurements.

ahc_gain_slopes_002

C06

same as ahc_gain_slopes_001

C07

For each channel: slope = -1.7%/K (average relative dependence) * gain constant (from ahc_gain_constants_002)

F08-1

F08-2

F08-3

F08-4

ahc_gain_slopes_003

2006 - 2009

Same as ahc_gain_slopes_001, added default slope to collection (default = 0)

ahc_gain_slopes_004

2006 - 2009

Same as ahc_gain_slopes_002, added default slope to collection (default = 0)

ahc_gain_slopes_005

2006 - 2009

Same as ahc_gain_slopes_004

C10

Values from C07

ahc_gain_slopes_006

C06 - F08-3

Same as ahc_gain_slopes_004

F08-4

For each channel: slope = -1.6%/K (average relative dependence) * gain constant (from ahc_gain_constants_006)

C10

For each channel: slope = -1.7%/K (average relative dependence) * gain constant (from ahc_gain_constants_006)

C11

value from C07

ahc_gain_slopes_007

C06 - F08-3

Same as ahc_gain_slopes_004

F08-4

Same as ahc_gain_slopes_006

C10

Same as ahc_gain_slopes_006

C11

TODO: get the information from provider?

ahc_gain_slopes_008

C06 - F08-3

Same as ahc_gain_slopes_004

C07

Same as ahc_gain_slopes_004, and updated for layers 12,22,28,29 by Segey. Slope = (-0.017) * gain(27), new Slope = - gain(T_ref)/((27-T_ref)*(-0.017)-1)*(-0.017). (gain constant and reference temperature are from ahc_gain_constants_008) Bug in default value

F08-4

Same as ahc_gain_slopes_006

C10

Same as ahc_gain_slopes_006

C11

Same as ahc_gain_slopes_007, and extended, available for the whole year

ahc_gain_slopes_009

C06 - F08-3

Same as ahc_gain_slopes_004

C07

Same as ahc_gain_slopes_004, and updated for layers 12,22,28,29 by Segey. Slope = (-0.017) * gain(27), new Slope = - gain(T_ref)/((27-T_ref)*(-0.017)-1)*(-0.017). (gain constant and reference temperature are from ahc_gain_constants_008)

F08-4

Same as ahc_gain_slopes_006

C10

Same as ahc_gain_slopes_006

C11

Same as ahc_gain_slopes_007, and extended, available for the whole year

outdated gain calibration folders

The tags of some outdated gain calibration folders are still listed here.

Measurement

comming soon...

The documentation of the tools used to extract the gain values from the binary files can be found in the section GainOnTheGrid.

HCAL Gain (last edited 2013-09-17 16:06:14 by ShaojunLu)