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Available on CMS information server CMS IN 2005/045 CMS Internal Note
 

Summary: Available on CMS information server CMS IN 2005/045
CMS Internal Note
The content of this note is intended for CMS internal use and distribution only
October 27, 2005
Comparison of PMT relative gains measured at
the University of Iowa and at CERN
K. Dindar, M.Deliomeroglu, E. GĻulmez,
Bogazici University, Bebek 34342 Istanbul, Turkey
U. Akgun, A. S. Ayan, Y.Onel, and I.Schmidt.
University of Iowa, Iowa City 52242 IA, USA
Abstract
Relative gains of the PMTs installed in the CMS-HF calorimeter were measured at the University of
Iowa PMT Test Station. Using the source data taken during the HF Test Beam period at CERN, PMT
gains were determined from the single photoelectron spectra for the HF Wedge 2-13. Comparing
these data provides an effective pedestal value and shows a very high correlation (r=0.994) between
the Iowa and CERN data sets.
1 Introduction
Calibration of the HF Calorimeter requires the gains of the PMTs used in the calorimeter. Although the relative
gains of all the PMTs were measured at the University of Iowa PMT test station prior to the installation as part
of the quality control process, we should determine and monitor the gains continuously to keep the calibration

  

Source: Akgun, Ugur - Department of Physics and Astronomy, University of Iowa

 

Collections: Physics