Imaging proportional counter for X-ray astronomy

Details Imaging proportional counter for X-ray astronomy Imaging proportional counter for X-ray astronomy

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979spie..184..239l&link_type=abstract

In: Space optics: Imaging X-ray optics workshop; Proceedings of the Seminar, Huntsville, Ala., May 22-24, 1979. (A80-17469 05-89

Astronomy and Astrophysics

Astronomy

Imaging Techniques, Proportional Counters, Signal Processing, X Ray Astronomy, Calibrating, Gas Mixtures, Position Sensing, Propane

Scientific paper

A position-sensitive proportional counter capable of imaging X-rays (0.1-3 keV) over a 10 cm x 10 cm aperture has been constructed. Positioning is obtained by sensing the signals induced by an X-ray event on the two orthogonal sets of cathode wires. Each cathode is divided into a series of cathode strips, each 0.5 cm wide. An X-ray event induces signals on several adjacent strips. Signals from each cathode strip are amplified separately and then added in an equally weighted and an unequally weighted summing amplifier. The position in each direction is obtained by dividing the output of the unequally weighted summer by that of the equally weighted summer. At 0.94 keV, the accuracy of the position sensing is 190 microns. At the same energy, the energy resolution is approximately 65% (FWHM). The proportional counter system is currently being incorporated into a sounding rocket payload having metal mirror optics, which is being constructed by the X-ray astronomy group at the California Institute of Technology.

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