A. S. Ayan
University of Iowa
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Featured researches published by A. S. Ayan.
Journal of Instrumentation | 2008
U. Akgun; A. S. Ayan; G Aydin; F. Duru; J. Olson; Y. Onel
We present the results of the tests performed on 90 photomultiplier tubes (PMT) to characterize their afterpulses. Three different types of H amamatsu 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 indivi dual rate contributions are characterized. The results from manufacturers independent tests on R7525 PMTs are reported, as well. The possible effects of these afterpulses on the future hadron c ollider experiments are also discussed.
Journal of Physics G | 2004
A. S. Ayan; N. Akchurin; U. Akgun; E. W. Anderson; Z Bagoly; G Y Bencze; P Bruecken; G. Debreczeni; I. Dumanoglu; E. Eskut; A. Fenyvesi; V. Gavrilov; A. Gribushin; Csaba Hajdu; J. M. Hauptman; A Kayis; V. Kolosov; S Kuleshov; J.-P. Merlo; M. J. Miller; E. McCliment; J. Molnar; A Nikitin; Y. Onel; G. Onengut; D. Osborne; N Özdeş-Koca; V Pikalov; A. Polatoz; I. Schmidt
The first pre-production-prototype (PPP-I) of the quartz fibre calorimeter of the CMS detector has been tested at CERN. The calorimeter consists of quartz fibres embedded in an iron matrix. Results are presented on the energy resolution and on the signal uniformity of the prototype for electrons and pions and the signal uniformity and linearity.
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms | 2002
N Akchurin; A. S. Ayan; Gy.L. Bencze; I Dumanoğlu; E. Eskut; A Fenyvesi; Adolfo A. Ferrando; V. Gavrilov; Csaba Hajdu; M.I. Josa; A Kayis; V. Kolosov; S. Kuleshov; A Kuzucu-Polatoz; D. Litvintsev; O Lobban; J.-P Merlo; J. Molnar; Y. Onel; G. Onengut; D. Osborne; N Özdeş-Koca; V. Stolin; L. Sulak; A. Ulyanov; S Uzunian; G. Vesztergombi; R. Wigmans; A. Yumashev; P. Zalan
The experiments at the Large Hadron Collider (LHC) will have to deal with unprecedented radiation levels. In the large-rapidity regions, close to the beam pipe, these levels reach megagrays per year. The detectors to be installed in these regions, the HF Calorimeters, are designed to operate under these conditions. In this paper, we describe the results of studies in which a prototype calorimeter was exposed to radiation of the type and intensity expected at the LHC. These studies made it possible to estimate the effects of this radiation on the response and the resolution of the calorimeter as a function of time during LHC operation.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2005
U. Akgun; A. S. Ayan; P. Bruecken; F. Duru; E. Gülmez; A. Mestvirishvilli; M. J. Miller; J. Olson; Y. Onel; I. Schmidt
