Status of the development of the imaging proportional counters for the Stellar X-ray Polarimeter.

Details Status of the development of the imaging proportional counters for the Stellar X-ray Polarimeter. Status of the development of the imaging proportional counters for the Stellar X-ray Polarimeter.

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ncimc..16..703s&link_type=abstract

Nuovo Cimento C, Vol. 16, N. 6, p. 703 - 707

Physics

1

X-Ray Telescopes: Polarimeters

Scientific paper

The Stellar X-ray Polarimeter SXRP will be flown at the focus of the SODART X-ray telescope aboard the Russian satellite SPECTRUM-X-Gamma by the end of 1995. Four imaging proportional counters will detect photons diffracted by a graphite crystal (2.6 and 5.2 keV) and scattered from a lithium rod enclosed in a beryllium case (from 5 to 20 keV). In this contribution the authors resume the results of the measurements performed on the engineering models of the counters. Position resolution of about 1.5 mm is attained with an energy resolution of about 25%. The pulse shape discrimination offers more than 98% 60Co events rejection, with at least 90% X-ray acceptance. Some improvements are foreseen for the flight units in terms of sensitivity and uniformity of response.

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