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Proceedings Paper

Development of EXITE2: a large-area imaging phoswich detector/telescope for hard x-ray astronomy
Author(s): Raj P. Manandhar; Kenneth S. K. Lum; Stephen S. Eikenberry; Martin Krockenberger; Jonathan E. Grindlay
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Paper Abstract

We review design considerations and present preliminary details of the performance of a new imaging system for hard X-ray astronomy in the 20 - 600 keV energy range. The detector is a 40 cm X 40 cm NaI(Tl)/CsI(Na) phoswich module, read out by a 7 X 7 array of square PMTs. The detector comprises the main part of the next generation Energetic X-ray Imaging Telescope Experiment (EXITE2), which had its first flight on 13 June 1993 from Palestine, Texas. Imaging is accomplished via the coded-aperture mask technique. The mask consists of 16 mm square lead/tin/copper pixels arranged in a cyclically repeated 13 X 11 uniformly redundant array pattern at a focal length of 2.5 m, giving 22 arcmin resolution. The field of view, determined by the lead/brass collimator (16 mm pitch) is 4.65 degrees FWHM. We anticipate a 3 sigma sensitivity of 1 X 10-5 photons cm-2 s-1 keV-1 at 100 keV in a 104 sec balloon observation. The electronics incorporate two on-board computers, providing a future capability to record the full data stream and telemeter compressed data. The design of the current detector and electronics allows an upgrade to EXITE3, which adds a proportional counter front-end to achieve lower background and better spatial and spectral resolution below approximately 100 keV.

Paper Details

Date Published: 19 November 1993
PDF: 11 pages
Proc. SPIE 2006, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV, (19 November 1993); doi: 10.1117/12.162834
Show Author Affiliations
Raj P. Manandhar, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Kenneth S. K. Lum, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Stephen S. Eikenberry, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Martin Krockenberger, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jonathan E. Grindlay, Harvard-Smithsonian Ctr. for Astrophysics (United States)


Published in SPIE Proceedings Vol. 2006:
EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV
Oswald H. W. Siegmund, Editor(s)

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