Investigations of a THGEM-based imaging detector

Abstract

We present the results of our recent studies on a Thick Gas Electron Multiplier (THGEM)-based imaging detector prototype. It consists of two 100x100 mm^2 THGEM electrodes in cascade, coupled to a resistive anode. The event location is recorded with a 2D double-sided readout electrode equipped with discrete delay-lines and dedicated electronics. The THGEM electrodes, produced by standard printed-circuit board and mechanical drilling techniques, a 0.4 mm thick with 0.5 mm diameter holes spaced by 1 mm. Localization resolutions of about 0.7 mm (FWHM) were measured with soft x-rays, in a detector operated with atmospheric-pressure Ar/CH4; good linearity and homogeneity were achieved. We describe the imaging-detector layout, the resistive-anode 2D readout system and the imaging properties. The THGEM has numerous potential applications that require large-area imaging detectors, with high-rate capability, single-electron sensitivity and moderate (sub-mm) localization resolution.

Published in JINST, 22 pages, 18 figures

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• Operation of a Thick Gas Electron Multiplier (THGEM) in Ar, Xe and Ar-Xe
• Laboratory studies of THGEM-based WELL structures with resistive anodes
• Concept of a novel fast neutron imaging detector based on THGEM for fan-beam tomography applications
• A Comprehensive Simulation Study of a Liquid-Xe Detector for Contraband Detection
• Recent advances with THGEM detectors
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• The Thick Gas Electron Multiplier and its derivatives: physics, technologies and applications
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• On the localization properties of an RPWELL gas-avalanche detector
• Beam induced space-charge effects in Time Projection Chambers in low-energy nuclear physics experiments
• Electrical breakdown in Thick-GEM based WELL detectors
• Evolution and Recent Developments of the Gaseous Photon Detectors Technologies
• Low-pressure THGEM-based operation with Ne+H2 Penning mixtures
• Cryogenic Gaseous Photomultiplier for Position Reconstruction of Liquid Argon Scintillation Light
• High-gain DC-mode operated Gaseous Photomultipliers for the visible spectral range