MPGD hole-by-hole gain scanning by UV excited single photoelectron detection

Gábor Nyitrai, G. Hamar, Gábor Galgóczi, Dezső Varga

Research output: Article

Abstract

The developed ”Leopard” high resolution scanner measures the single electron response of MPGDs. Therefore it became possible to quantify the amplification of individual holes. A UV light source is focused on the MPGD surface and single photoelectron spectra is recorded in every pixel over the selected two dimensional region (map). This way the MPGD gain and the photoelectron yield is clearly separated and can be computed. The single photoelectron spectrum also provides information about the exact distribution shape of the low amplitude responses as well. The MPGD surface structure is well observable on the photoelectron map. As expected, the gain map fluctuates hole by hole, but it is constant around a given hole. This technology reveals the microstructure of photo-efficiency and local gain to quantitatively compare different MPGD geometries and thus provides a powerful tool for e.g. GEM quality assurance.

Fingerprint

Photoelectrons
photoelectrons
Scanning
scanning
Air cushion vehicles
assurance
Quality assurance
Surface structure
Ultraviolet radiation
scanners
Amplification
light sources
Pixels
pixels
microstructure
Microstructure
Geometry
Electrons
high resolution
geometry

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

Cite this

@article{76b374b738b54ca88a527adb0587a466,
title = "MPGD hole-by-hole gain scanning by UV excited single photoelectron detection",
abstract = "The developed ”Leopard” high resolution scanner measures the single electron response of MPGDs. Therefore it became possible to quantify the amplification of individual holes. A UV light source is focused on the MPGD surface and single photoelectron spectra is recorded in every pixel over the selected two dimensional region (map). This way the MPGD gain and the photoelectron yield is clearly separated and can be computed. The single photoelectron spectrum also provides information about the exact distribution shape of the low amplitude responses as well. The MPGD surface structure is well observable on the photoelectron map. As expected, the gain map fluctuates hole by hole, but it is constant around a given hole. This technology reveals the microstructure of photo-efficiency and local gain to quantitatively compare different MPGD geometries and thus provides a powerful tool for e.g. GEM quality assurance.",
keywords = "GEM quality assurance, MPGD, ThickGEM",
author = "G{\'a}bor Nyitrai and G. Hamar and G{\'a}bor Galg{\'o}czi and Dezső Varga",
year = "2019",
month = "1",
day = "1",
doi = "10.1016/j.nima.2019.162726",
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 - MPGD hole-by-hole gain scanning by UV excited single photoelectron detection

AU - Nyitrai, Gábor

AU - Hamar, G.

AU - Galgóczi, Gábor

AU - Varga, Dezső

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The developed ”Leopard” high resolution scanner measures the single electron response of MPGDs. Therefore it became possible to quantify the amplification of individual holes. A UV light source is focused on the MPGD surface and single photoelectron spectra is recorded in every pixel over the selected two dimensional region (map). This way the MPGD gain and the photoelectron yield is clearly separated and can be computed. The single photoelectron spectrum also provides information about the exact distribution shape of the low amplitude responses as well. The MPGD surface structure is well observable on the photoelectron map. As expected, the gain map fluctuates hole by hole, but it is constant around a given hole. This technology reveals the microstructure of photo-efficiency and local gain to quantitatively compare different MPGD geometries and thus provides a powerful tool for e.g. GEM quality assurance.

AB - The developed ”Leopard” high resolution scanner measures the single electron response of MPGDs. Therefore it became possible to quantify the amplification of individual holes. A UV light source is focused on the MPGD surface and single photoelectron spectra is recorded in every pixel over the selected two dimensional region (map). This way the MPGD gain and the photoelectron yield is clearly separated and can be computed. The single photoelectron spectrum also provides information about the exact distribution shape of the low amplitude responses as well. The MPGD surface structure is well observable on the photoelectron map. As expected, the gain map fluctuates hole by hole, but it is constant around a given hole. This technology reveals the microstructure of photo-efficiency and local gain to quantitatively compare different MPGD geometries and thus provides a powerful tool for e.g. GEM quality assurance.

KW - GEM quality assurance

KW - MPGD

KW - ThickGEM

UR - http://www.scopus.com/inward/record.url?scp=85072249856&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85072249856&partnerID=8YFLogxK

U2 - 10.1016/j.nima.2019.162726

DO - 10.1016/j.nima.2019.162726

M3 - Article

AN - SCOPUS:85072249856

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

M1 - 162726

ER -