Investigation of the properties of Thick-GEM photocathodes by microscopic scale measurements with single photo-electrons

G. Hamar, S. Dalla Torre, S. S. Dasgupta, B. Gobbo, S. Levorato, F. Tessarotto, D. Varga

Research output: Article

2 Citations (Scopus)

Abstract

Novel Cherenkov detector upgrades favour GEM and ThickGEM (THGEM) based MPGD systems. These detectors have reduced ion backflow, fast signal formation, high gain, and could suppress the MIP signals as well. Sources of concern are the possible inefficiencies of the photo-electron collection from the top of the THGEM and the local variation of the gain related to geometrical non-uniformity. The developed high resolution scanner using a focused UV light gave the possibility to study single photo-electron response of MPGDs in the submillimeter scale. Revealing the microstructure of photo-efficiency and local gain provides a new tool to quantitatively compare different THGEM geometries and field-configurations, and thus optimize the detector parameters. The presentation described the key elements of the scanning system and focus, in particular, on the microstructure evolution of different Thick-GEM configurations providing optimization recipes.

Fingerprint

Air cushion vehicles
Photocathodes
photocathodes
Detectors
Electrons
detectors
microstructure
Microstructure
electrons
configurations
high gain
nonuniformity
Ultraviolet radiation
scanners
Scanning
optimization
scanning
Geometry
high resolution
Ions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

@article{8f19e3d40dcb4d66b6cf2b3287b33f0a,
title = "Investigation of the properties of Thick-GEM photocathodes by microscopic scale measurements with single photo-electrons",
abstract = "Novel Cherenkov detector upgrades favour GEM and ThickGEM (THGEM) based MPGD systems. These detectors have reduced ion backflow, fast signal formation, high gain, and could suppress the MIP signals as well. Sources of concern are the possible inefficiencies of the photo-electron collection from the top of the THGEM and the local variation of the gain related to geometrical non-uniformity. The developed high resolution scanner using a focused UV light gave the possibility to study single photo-electron response of MPGDs in the submillimeter scale. Revealing the microstructure of photo-efficiency and local gain provides a new tool to quantitatively compare different THGEM geometries and field-configurations, and thus optimize the detector parameters. The presentation described the key elements of the scanning system and focus, in particular, on the microstructure evolution of different Thick-GEM configurations providing optimization recipes.",
keywords = "Cherenkov detector, MPGD, Thick GEM, UV photon detector",
author = "G. Hamar and Torre, {S. Dalla} and Dasgupta, {S. S.} and B. Gobbo and S. Levorato and F. Tessarotto and D. Varga",
year = "2017",
month = "1",
day = "16",
doi = "10.1016/j.nima.2017.03.016",
language = "English",
journal = "Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment",
issn = "0168-9002",
publisher = "Elsevier",

}

TY - JOUR

T1 - Investigation of the properties of Thick-GEM photocathodes by microscopic scale measurements with single photo-electrons

AU - Hamar, G.

AU - Torre, S. Dalla

AU - Dasgupta, S. S.

AU - Gobbo, B.

AU - Levorato, S.

AU - Tessarotto, F.

AU - Varga, D.

PY - 2017/1/16

Y1 - 2017/1/16

N2 - Novel Cherenkov detector upgrades favour GEM and ThickGEM (THGEM) based MPGD systems. These detectors have reduced ion backflow, fast signal formation, high gain, and could suppress the MIP signals as well. Sources of concern are the possible inefficiencies of the photo-electron collection from the top of the THGEM and the local variation of the gain related to geometrical non-uniformity. The developed high resolution scanner using a focused UV light gave the possibility to study single photo-electron response of MPGDs in the submillimeter scale. Revealing the microstructure of photo-efficiency and local gain provides a new tool to quantitatively compare different THGEM geometries and field-configurations, and thus optimize the detector parameters. The presentation described the key elements of the scanning system and focus, in particular, on the microstructure evolution of different Thick-GEM configurations providing optimization recipes.

AB - Novel Cherenkov detector upgrades favour GEM and ThickGEM (THGEM) based MPGD systems. These detectors have reduced ion backflow, fast signal formation, high gain, and could suppress the MIP signals as well. Sources of concern are the possible inefficiencies of the photo-electron collection from the top of the THGEM and the local variation of the gain related to geometrical non-uniformity. The developed high resolution scanner using a focused UV light gave the possibility to study single photo-electron response of MPGDs in the submillimeter scale. Revealing the microstructure of photo-efficiency and local gain provides a new tool to quantitatively compare different THGEM geometries and field-configurations, and thus optimize the detector parameters. The presentation described the key elements of the scanning system and focus, in particular, on the microstructure evolution of different Thick-GEM configurations providing optimization recipes.

KW - Cherenkov detector

KW - MPGD

KW - Thick GEM

KW - UV photon detector

UR - http://www.scopus.com/inward/record.url?scp=85015618788&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85015618788&partnerID=8YFLogxK

U2 - 10.1016/j.nima.2017.03.016

DO - 10.1016/j.nima.2017.03.016

M3 - Article

AN - SCOPUS:85015618788

JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

SN - 0168-9002

ER -