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October 14, 2005 9:53 Proceedings Trim Size: 9in x 6in gulmezcomo05 USING SINGLE PHOTOELECTRON SPECTRA IN THE
 

Summary: October 14, 2005 9:53 Proceedings Trim Size: 9in x 6in gulmezcomo05
USING SINGLE PHOTOELECTRON SPECTRA IN THE
CALIBRATION OF THE CMS-HF CALORIMETER
E. GĻULMEZ, M.DELIOMEROGLU, AND K. DINDAR
Bogazici University, Bebek 34342 Istanbul, Turkey
E-mail: gulmez@boun.edu.tr
U. AKGUN, A. S. AYAN, Y.ONEL, AND I.SCHMIDT
University of Iowa, Iowa City 52242 IA, USA
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 2004 at CERN, PMT gains were determined from the
single photoelectron spectra. Comparing these data provides an effective pedestal
value and shows a very high correlation (r=0.994). PMT gains obtained in this
way can be used for final calibration of the HF calorimeter.
1. Introduction
Calibration of the HF Calorimeter requires the gains of the PMTs used in
the calorimeter. One way of measuring the PMT gains would be to use
the single photoelectron spectra. Such a set of data were taken during the
test beam 2004 period with some of the HF wedges using a 5mCi 60
Co

  

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

 

Collections: Physics