Investigation of the microstructure of Thick-GEMs with single photo electrons

Gergo Hamar, Silvia Dalla Torre, Shuddha Shankar Dasgupta, Stefano Levorato, Fulvio Tessarotto, Dezso Varga

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

Novel Cherenkov detector upgrades favour GEM and ThickGEM based MPGD systems. These detectors have reduced ion backflow, fast signal formation, high gain, and could suppress the MIP signals as well. Their common drawbacks are the inefficiencies of photo-electron collection from the top of the ThickGEM and the local variation of multiplication due to the special geometry. The developed high resolution scanner using focused UV light gave the possibility to study single photo- electron response of MPGDs in the sub-millimeter scale. Revealing the microstructure of photo-efficiency and local gain provides a new tool to quantitatively compare different ThickGEM geometries and field- configurations. and thus optimize the detector parameters. The presentation will focus on the key elements of the scanning system: And on the microstructure evolution of different ThickGEM configurations.

Original languageEnglish
Article number03006
JournalEPJ Web of Conferences
Volume174
DOIs
Publication statusPublished - Feb 21 2018
Event4th International Conference on MicroPattern Gaseous Detectors, MPGD 2015 - Trieste, Italy
Duration: Oct 12 2015Oct 15 2015

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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