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Revision 16 as of 2011-06-08 12:38:58
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||<rowspan=2> '''ahc_ic_constants_005''' ||2006 - 2009 || same as '''ahc_ic_constants_004''' || ||<rowspan=3> '''ahc_ic_constants_005''' ||2006 - 2009 || same as '''ahc_ic_constants_004''' ||
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|| C11 || Value from C07 ||

HCal Electronics Intercalibration

Constants of the electronics intercalibration have units [ADUc/ADUp], where ADUc and ADUp are ADC units in calibration and physics mode, respectively.

Storage / Availability

The constants are made available in the database in folder


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: ic_constants


Time / HV Period



2006 - 2009

Cleaned-up averages from CERN 2007 measurements. Missing values: use cleaned-up average from 2008 measurements, if available.



Cleaned-up averages from CERN 2007 measurements. Missing values: use cleaned-up average from DESY re-calibration measurements, if available (modules 1, 2, 14, 25 only).



Cleaned-up averages from FNAL 2008 measurements.





2006 - 2009

Copy of ahc_ic_constants_001, add collection parameters for default values (default IC = 10)


2006 - 2009

Copy of ahc_ic_constants_002, add collection parameters for default values (default IC = 10)


2006 - 2009

same as ahc_ic_constants_004


Value updated by Clemens, the value were extracted by Jara from C10.


Value from C07

outdated intercalibration folders

The tags of some outdated intercalibration folders are still listed here.


coming soon...

Clean-up Procedure

Since the spread of the differences between single measurements and the average values for each channel appears to be much larger than the expected 1-2% a selection procedure is applied to reduce it. All measured values for each single channel are sorted by size. Starting in the middle and going up, the relative differences between subsequent values are checked. As soon as a jump of more than 1% is encountered, the remaining values in this direction are removed. Afterwards, the same is done for the opposite direction, this time starting one value before the middle and going down. The remaining values are averaged. This reduces the spread mentioned above to the expected range.

HCAL Inter (last edited 2013-08-29 08:17:21 by ShaojunLu)