Imaging proportional counters for the stellar X-ray polarimeter

Details Imaging proportional counters for the stellar X-ray polarimeter Imaging proportional counters for the stellar X-ray polarimeter

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1344...74w&link_type=abstract

IN: EUV, X-ray, and Gamma-ray instrumentation for astronomy; Proceedings of the Meeting, San Diego, CA, July 11-13, 1990 (A92-20

Astronomy and Astrophysics

Astronomy

1

Background Radiation, Polarimeters, Proportional Counters, X Rays, Astronomical Polarimetry, Cobalt 60, X Ray Scattering

Scientific paper

The xenon-filled IPCs being developed for the Stellar X-ray Polarimeter are described. The requirements placed on the IPCs by the design of the polarimeter are discussed and results on the performance of prototype counters are presented. The design of a prototype of the IPCs is described. Finally, the performance of the prototype is reported. Due to the extremely low count rates encountered in X-ray polarimetry, efficient background rejection is the most critical parameter of the IPCs. Using a background rejection scheme employing anticoincidence and pulse shape discrimination, a rejection efficiency of 99 percent has been achieved for Co-60-induced events over an energy range of 2 to 15 keV while retaining more than 80 percent of the X-ray efficiency.

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