Cryogenic Gaseous Photomultiplier for Position Reconstruction of Liquid Argon Scintillation Light

Abstract

Presented here are first tests of a Gaseous Photomultiplier based on a cascade of Thick GEM structures intended for gamma-ray position reconstruction in liquid Argon. The detector has a MgF${}_2$ window, transparent to VUV light, and a CsI photocathode deposited on the first THGEM. A gain of $8\cdot 10^5$ per photoelectron and $\sim 100\%$ photoelectron collection efficiency are measured at stable operation settings. The excellent position resolution capabilities of the detector (better than 100 $\mu$m) at 100 kHz readout rate, is demonstrated at room temperature. Structural integrity tests of the detector and seals are successfully performed at cryogenic temperatures by immersing the detector in liquid Nitrogen, laying a good foundation for future operation tests in noble liquids.

16 pages, 13 figures

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Cited by in corpus (2)

• The Thick Gas Electron Multiplier and its derivatives: physics, technologies and applications
• Study of a sealed high gas pressure THGEM detector and response of Alpha particle spectra