Single electron multiplication distribution in GEM avalanches

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In this paper, measurement results and experimental methodology are presented on the determination of multiplication distributions of avalanches initiated by single electron in GEM foils. The measurement relies on the amplification of photoelectrons by the GEM under study, which is subsequently amplified in an MWPC for signal enhancement and readout. The intrinsic detector resolution, namely the sigma-over-mean ratio of the multiplication distribution is also elaborated. Small gain dependence of the shape of the avalanche response distribution is observed in the range of net effective gain of 15 to 100. The distribution has an exponentially decaying tail at large amplitudes. At small amplitudes, the applied working gas is seen to have a well visible effect on the shape of the multiplication distribution. Equivalently, the working gas has an influence on the intrinsic detector resolution of GEMs via suppression of the low amplitude responses. A sigma-over-mean ratio of 0.75 was reached using a neon based mixture, whereas other gases provided an intrinsic detector resolution closer to 1, meaning a multiplication distribution closer to the low-field limit exponential case.

Original languageEnglish
Article numberP10017
JournalJournal of Instrumentation
Volume11
Issue number10
DOIs
Publication statusPublished - Oct 25 2016

Fingerprint

Air cushion vehicles
Avalanche
multiplication
avalanches
Multiplication
Electron
Detectors
Electrons
Gases
Neon
electrons
Detector
Photoelectrons
Metal foil
Amplification
detectors
gases
neon
readout
Tail

Keywords

  • Charge transport and multiplication in gas
  • Electron multipliers (gas)
  • etc)
  • Gaseous detectors
  • GEM
  • InGrid
  • MHSP
  • MICROMEGAS
  • Micropattern gaseous detectors (MSGC
  • MICROPIC
  • RETHGEM
  • THGEM

ASJC Scopus subject areas

  • Instrumentation
  • Mathematical Physics

Cite this

Single electron multiplication distribution in GEM avalanches. / László, A.; Hamar, G.; Kiss, G.; Varga, Dezso.

In: Journal of Instrumentation, Vol. 11, No. 10, P10017, 25.10.2016.

Research output: Contribution to journalArticle

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