Impact of GEM foil hole geometry on GEM detector gain

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http://hdl.handle.net/10138/173941

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Karadzhinova , A G , Nolvi , A M , Veenhof , R , Tuominen , E M , Haeggström , E O & Kassamakov , I V 2015 , ' Impact of GEM foil hole geometry on GEM detector gain ' , Journal of Instrumentation , vol. 10 , P12014 . https://doi.org/10.1088/1748-0221/10/12/P12014

Title: Impact of GEM foil hole geometry on GEM detector gain
Author: Karadzhinova, Aneliya Georgieva; Nolvi, Anton Mikael; Veenhof, Rob; Tuominen, Eija Maarit; Haeggström, Edward Olof; Kassamakov, Ivan Vladislavov
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2015-12-18
Language: eng
Number of pages: 16
Belongs to series: Journal of Instrumentation
ISSN: 1748-0221
URI: http://hdl.handle.net/10138/173941
Abstract: Detailed 3D imaging of Gas Electron Multiplier (GEM) foil hole geometry was realized. Scanning White Light Interferometry was used to examine six topological parameters of GEM foil holes from both sides of the foil. To study the effect of the hole geometry on detector gain, the ANSYS and Garfield ++ software were employed to simulate the GEM detector gain on the basis of SWLI data. In particular, the effective gain in a GEM foil with equally shaped holes was studied. The real GEM foil holes exhibited a 4% lower effective gain and 6% more electrons produced near the exit electrode of the GEM foil than the design anticipated. Our results indicate that the GEM foil hole geometry affects the gain performance of GEM detectors.
Subject: 114 Physical sciences
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