On the operation of a Micropattern Gaseous UV-Photomultiplier in Liquid-Xenon

Abstract

Operation results are presented of a UV-sensitive gaseous photomultiplier (GPM) coupled through a MgF2 window to a liquid-xenon scintillator. It consisted of a reflective CsI photocathode deposited on top of a THick Gaseous Electron Multiplier (THGEM); further multiplication stages were either a second THGEM or a Parallel Ionization Multiplier (PIM) followed by a MICROMEsh GAseous Structure (MICROMEGAS). The GPM operated in gas-flow mode with non-condensable gas mixtures. Gains of 10^4 were measured with a CsI-coated double-THGEM detector in Ne/CH4 (95:5), Ne/CF4 (95:5) and Ne/CH4/CF4 (90:5:5), with soft X-rays at 173 K. Scintillation signals induced by alpha particles in liquid xenon were measured here for the first time with a double-THGEM GPM in He/CH4 (92.5:7.5) and a triple-structure THGEM/PIM/MICROMEGAS GPM in Ne/CH4 (90:10) with a fast-current preamplifier.

arXiv comment12 pages, 9 figures, submitted to JINST

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• First observation of liquid-xenon proportional electroluminescence in THGEM holes
• Hybrid Multi Micropattern Gaseous Photomultiplier for detection of liquid-xenon scintillation
• On the low-temperature performances of THGEM and THGEM/G-APD multipliers in gaseous and two-phase Xe
• Recent advances with THGEM detectors
• First in-beam studies of a Resistive-Plate WELL gaseous multiplier
• A Comprehensive Simulation Study of a Liquid-Xe Detector for Contraband Detection
• First results of a large-area cryogenic gaseous photomultiplier coupled to a dual-phase liquid xenon TPC
• The Thick Gas Electron Multiplier and its derivatives: physics, technologies and applications
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