Recent advances in bubble-assisted Liquid Hole-Multipliers in liquid xenon

E. Erdal, L. Arazi, A. Tesi, A. Roy, S. Shchemelinin, D. Vartsky, A. Breskin

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We report on recent advances in the operation of bubble-assisted Liquid Hole-Multipliers (LHM). By confining a vapor bubble under or adjacent to a perforated electrode immersed in liquid xenon, we could record both radiation-induced ionization electrons and primary scintillation photons in the noble liquid. Four types of LHM electrodes were investigated: a THGEM, standard double-conical GEM, 50 μm-thick single-conical GEM (SC-GEM) and 125 μm-thick SC-GEM - all coated with CsI photocathodes. The 125 μm-thick SC-GEM provided the highest electroluminescence (EL) yields, up to ∼ 400 photons per electron over 4π , with an RMS pulse-height resolution reaching 5.5% for events comprising ∼ 7000 primary electrons. Applying a high transfer field across the bubble, the EL yield was further increased by a factor of ∼ 5. The feasibility of a vertical-mode LHM, with the bubble confined between two vertical electrodes, and the operation of a two-stage LHM configuration were demonstrated for the first time. We combine electrostatic simulations with observed signals to draw conclusions regarding the location of the liquid-gas interface and suggest an explanation for the observed differences in EL yield between the investigated electrodes.

Original languageEnglish
Article numberP12008
JournalJournal of Instrumentation
Volume13
Issue number12
DOIs
StatePublished - 4 Dec 2018

Keywords

  • Charge transport, multiplication and electroluminescence in rare gases and liquids
  • Micropattern gaseous detectors (MSGC, GEM, THGEM, RETHGEM, MHSP, MICROPIC, MICROMEGAS, InGrid, etc)
  • Noble liquid detectors (scintillation, ionization, double-phase)

ASJC Scopus subject areas

  • Mathematical Physics
  • Instrumentation

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