CERN Accelerating science

Published Articles
Title	Low temperature characteristics of SiPMs after very high neutron irradiation
Related title	Low temperature characteristics of SiPMs after very high neutron irradiation
Author(s)	Heering, A ; Musienko, Yu ; Gonzales, J (CERN) ; Karneyeu, A ; Wayne, M ; Ruchti, R ; Moll, M
Publication	2019
In:	Nucl. Instrum. Meth. A 936 (2019) 671-673
DOI	10.1016/j.nima.2018.09.111
Subject category	Detectors and Experimental Techniques ; Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	The design of the CMS phase II upgrade for the HL-LHC uses SiPMs for the Barrel Timing Layer (BTL) and the Behind HCAL detector (BH or CEH). In both sub-detectors the SiPMs will see a 1 MeV equivalent dose of around n/cm. To lower the noise in the SiPMs the design is to keep the SiPMs at a low temperature of −30 C. Different samples from two manufactures of SiPMs were irradiated to a total dose of resp. 2 , 5 at the TRIGA reactor at the JSI in Slovenia. The noise in SiPMs is dominated by trap assisted tunneling which is a result of the high internal electric field in SiPMs. We therefore studied the noise behavior from ＋10 C to −40 C from standard high internal field and specially designed low field SiPMs from FBK-irst and Hamamatsu. After the initial characterization before annealing the noise decrease in SiPMs was also studied using accelerated annealing.
Copyright/License	publication: © 2018 Elsevier B.V. (License: CC-BY-4.0)

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