Design and in orbit performance of the ROSAT PSPC

Computer Science – Performance

Scientific paper

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Position (Location), Proportional Counters, Rosat Mission, Spaceborne Astronomy, X Ray Astronomy, Design Analysis, Images, Satellite-Borne Instruments, Spaceborne Telescopes, Spacecraft Performance

Scientific paper

The Position Sensitive Proportional Counter (PSPC) is the prime focal plane instrument on board the X-ray astronomy satellite Rosat. It is a conventional multiwire counter, operating in an energy range from 0.1 to 2.4 keV. Its performance results in an energy resolution of delta E/E 0.41 FWHM, a position resolution of 230 micrometers FWHM and a quantum efficiency of 50 percent at 1 keV respectively. The background rejection capability in orbit of 99.85 percent was even higher than expected. Therefore the X-ray images have a high contrast, with a residual charged particle induced background as low as 0.000005 cts/s/sq arcmin/keV. The gain stability of the detector is very high, with a short time variation over one orbit of less than 1 percent and a long term gain drift over one month of 0.5 percent. The redundant PSPC, which is in operation since Jan. 1991, shows about the same performance.

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