The UCSD high energy X-ray timing experiment cosmic ray particle anticoincidence detector

Details The UCSD high energy X-ray timing experiment cosmic ray particle anticoincidence detector The UCSD high energy X-ray timing experiment cosmic ray particle anticoincidence detector

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1549..193h&link_type=abstract

In: EUV, X-ray, and gamma-ray instrumentation for astronomy II; Proceedings of the Meeting, San Diego, CA, July 24-26, 1991 (A93

Astronomy and Astrophysics

Astronomy

3

Coincidence Circuits, Cosmic Rays, High Energy Interactions, Radiation Counters, Scintillation Counters, X Ray Timing Explorer, Charged Particles, Computer Aided Design, Cosmic X Rays

Scientific paper

The HEXTE, part of the X-Ray Timing Explorer (XTE), is designed to make high sensitivity temporal and spectral measurements of X-rays with energies between 15 and 250 keV using NaI/CsI phoswich scintillation counters. To achieve the required sensitivity it is necessary to provide anticoincidence of charged cosmic ray particles incident upon the instrument, some of which interact to produce background X-rays. The proposed cosmic ray particle anticoincidence shield detector for HEXTE uses a novel design based on plastic scintillators and wavelength-shifter bars. It consists of five segments, each with a 7 mm thick plastic scintillator, roughly 50 cm x 50 cm in size, coupled to two wavelength-shifter bars viewed by 1/2 inch photomultiplier tubes. These segments are configured into a five-sided, box-like structure around the main detector system. Results of laboratory testing of a model segment, and calculations of the expected performance of the flight segments and particle anticoincidence detector system are presented to demonstrate that the above anticoincidence detector system satisfies its scientific requirements.

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