Response of CMS avalanche photo-diodes to low energy neutrons

被引:3
作者
Brown, R. M. [2 ]
Deiters, K. [1 ]
Ingram, Q. [1 ]
Renker, D. [1 ]
机构
[1] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
[2] Rutherford Appleton Lab, STFC, Didcot OX11 0QX, Oxon, England
关键词
Photosensors; Silicon avalanche photodiodes; Calorimetry; Response to neutrons; PHOTODIODES;
D O I
10.1016/j.nima.2011.12.005
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
The response of the Avalanche Photo-diodes (APDs) installed in the CMS detector at the LHC to neutrons from (AmBe)-Am-241 and Cf-252 sources is reported. Signals in size equivalent to those of up to 10(6) photo-electrons with the nominal APD gain are observed. Measurements with an APD with the protective epoxy coating removed and with the source placed behind the APD show that there is an important response due to recoil protons from neutron interactions with the hydrogen in the epoxy, in addition to signals from neutron interactions with the silicon of the diode. The effective gain of these signals is much smaller than the diode's nominal gain. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:146 / 149
页数:4
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