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

S. Duval (1) , A. Breskin (2) , R. Budnik (2) , W.T. Chen (1) , H. Carduner (1) , M. Cortesi (2) , J.P.Cussonneau (1) , J. Donnard (1)

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J. Lamblin (1) P. Le Ray (1) E. Morteau (1) T. Oger (1) J.S. Stutzmann (1) D.Thers (1) ((1) Subatech Ecole des Mines CNRS/IN2P3 Nantes University (2) Department of Astrophysics Particle Physics Weizmann Institute of Science)

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classification ⚛️ physics.ins-det

keywords gaseousthgemweredouble-thgemliquid-xenonmeasuredmicromegasmultiplier

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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.

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

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