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Investigations of a THGEM-based imaging detector

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M Cortesi1, R Alon1, R Chechik1, A Breskin1, D Vartsky2 and V Dangendorf3

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We present the results of our recent studies on a Thick Gas Electron Multiplier (THGEM)-based imaging detector prototype. It consists of two 100  ×  100 mm2 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.

Keywords

Charge transport and multiplication in gas

X-ray detectors

Gaseous detectors

Electron multipliers (gas)

PACS

29.40.Gx Tracking and position-sensitive detectors

85.60.Ha Photomultipliers; phototubes and photocathodes

84.30.-r Electronic circuits

Subjects

Accelerators, beams and electromagnetism

Electronics and devices

Nuclear physics

Instrumentation and measurement

Optics, quantum optics and lasers

Particle physics and field theory

Dates

Issue 09 (September 2007)

Received 21 July 2007, accepted for publication 29 August 2007

Published 4 September 2007



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