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Proceedings Paper

Study of high-pressure xenon gas scintillation drift chambers with wave-shifting fiber and CsI photocathode readouts
Author(s): Jeff Wilkerson; Timothy K. Edberg; Jason Hamm; Bernard Sadoulet; Paul Shestople; Garth Smith
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Paper Abstract

We are studying high pressure (20 atmospheres) xenon gas scintillation drift chambers for use in hard x-ray astronomy. These detectors combine the concepts of the gas scintillation proportional counter and the time projection chamber, with the scintillation light read out using waveshifting fibers or plane parallel proportional counters with CsI photocathodes. We have operated both a small technical prototype and a large flight prototype chamber. The CSI photocathodes have consistently given quantum efficiencies near 30% for the detection of xenon scintillation light and plane parallel proportional counters filled with methane have provided gains better than 106. The small GSDC with a CsI readout has a measured energy resolution of 6.0% FWHM at 30 keV, within about a factor of two and a half of the ultimate resolution obtainable in the device. The resolution is currently limited by spread of the incident x-ray beam causing a variable fraction of scintillation light to be observed for each event. We report on the development status of this technology.

Paper Details

Date Published: 18 October 1996
PDF: 11 pages
Proc. SPIE 2806, Gamma-Ray and Cosmic-Ray Detectors, Techniques, and Missions, (18 October 1996); doi: 10.1117/12.253998
Show Author Affiliations
Jeff Wilkerson, Univ. of California/Berkeley (United States)
Timothy K. Edberg, Univ. of California/Berkeley (United States)
Jason Hamm, Univ. of California/Berkeley (United States)
Bernard Sadoulet, Univ. of California/Berkeley (United States)
Paul Shestople, Univ. of California/Berkeley (United States)
Garth Smith, Univ. of California/Berkeley (United States)

Published in SPIE Proceedings Vol. 2806:
Gamma-Ray and Cosmic-Ray Detectors, Techniques, and Missions
Brian D. Ramsey; Thomas A. Parnell, Editor(s)

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