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Quantitative aging study with intense irradiation tests for the CMS forward RPCs

Authors
Kim, H. C.Bahk, S. Y.Hong, B.Hong, S. J.Hu, R. J.Jo, M. H.Kim, C.Kim, Y. J.Kim, Y. U.Lee, K. S.Lee, S. J.Nam, S. K.Park, S. K.Rhee, H. B.Rhee, J. T.Sim, K. S.
Issue Date
1-May-2009
Publisher
ELSEVIER
Keywords
Compact Muon Solenoid; Large Hadron Collider; Muon trigger detector; Aging effect; Gamma irradiation; Neutron irradiation
Citation
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, v.602, no.3, pp.771 - 774
Indexed
SCIE
SCOPUS
Journal Title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume
602
Number
3
Start Page
771
End Page
774
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/120073
DOI
10.1016/j.nima.2008.12.140
ISSN
0168-9002
Abstract
A systematic study with a series of irradiation tests was performed for the forward resistive plate chambers (RPCs) of the Compact Muon Solenoid (CMS) in the Large Hadron Collider (LHC) experiment. Small double-gap RPCs were manufactured and tested by the gamma rays emitted from a 200 mCi Cs-137 source at Korea University and by the fast neutrons provided by the MC50 proton cyclotron at the Korea Institute Radiological and Medical Science (KIRAMS). We found no significant symptom of aging in the performance of the prototype RPCs, as a consequence of the neutron irradiation, whose total equivalent dose was approximately 45 Gy. However, a fast degradation was observed in the RPCs when the gamma signal rates were higher than 3 kHz cm(-2). Furthermore, we observed from the chemical analysis for the RPC electrode that the long-term performance of the RPCs was stable in spite of absorbing the highlevel fluorine when the signal rates were lower than 2 kHz cm(-2). (C) 2008 Elsevier B.V. All rights reserved.
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