Cryogenic Gaseous Photomultiplier for Position Reconstruction of Liquid Argon Scintillation Light
Journal
JINST
Journal Volume
10
Journal Issue
07
Pages
P07017
Date Issued
2015
Author(s)
Paredes, B. Lopez
Azevedo, C. D. R.
Silva, A. L. M.
Spooner, N. J. C.
Veloso, J. F. C. A.
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 MgF2 window, transparent to VUV light, and a CsI photocathode deposited on the first THGEM . A gain of 8? 105 per photoelectron and ~ 100% photoelectron collection efficiency are measured at stable operation settings. The excellent position resolution capabilities of the detector (better than 100 �gm) 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.
Type
journal article