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Available on CMS information server IN 2006/019 CMS Internal Note

Summary: Available on CMS information server IN 2006/019
CMS Internal Note
The content of this note is intended for CMS internal use and distribution only
Jan 20, 2006
Comparison of resistive and parallel dynode bases
J. Olson, U. Akgun, T. Huebner, D. Monner, Y. Onel
University of Iowa, Iowa City, Iowa,USA
E. Gülmez
Bogazici University, Istanbul, Turkey
HF calorimeter readout system uses 2000 Hamamatsu R7525HA PMTs. PMT characteristics were studied for
each of the PMT's at the University of Iowa CMS Laboratories using a resistive base made by the manufacturer
Hamamatsu. The production level bases installed in HF, called the parallel-dynode bases, are parallel base
boards that were designed at Fermilab. A comparison was made between the responses of the different designs
and the results are presented.
1 Introduction
Hamamatsu resistive base (HRB) is a PMT socket with a series set of resistors connected between the
appropriate pins of the socket to provide the different voltages for the dynodes of the PMT from a single voltage
supply. The resistors are mega-ohm values precisely chosen to maximize signal gain or linearity. This is the


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


Collections: Physics