PUBLISHED BY INSTITUTE OF PHYSICS PUBLISHING AND SISSA
RECEIVED: November 25, 2007
ACCEPTED: January 4, 2008
PUBLISHED: January 24, 2008
Afterpulse timing and rate investigation of three
different Hamamatsu Photomultiplier Tubes
U. Akgun, A.S. Ayan, G. Aydin, F. Duru, J. Olson and Y. Onel
The University of Iowa, Department of Physics and Astronomy,
Iowa City, IA, 52242, U.S.A.
ABSTRACT: We present the results of the tests performed on 90 photomultiplier tubes (PMT) to
characterize their afterpulses. Three different types of Hamamatsu PMTs (R7525, R6427, and
R1398) were studied for their afterpulse rates and timings at different incident light intensities and
gain values, at the University of Iowa PMT test station. Afterpulse rates show slight increase with
the PMT gain, but there is almost no dependence on incident light intensity. Three specific time
delays are determined for the afterpulses, and their individual rate contributions are characterized.
The results from manufacturer's independent tests on R7525 PMTs are reported, as well. The
possible effects of these afterpulses on the future hadron collider experiments are also discussed.