Wide-field coded-mask x-ray cameras for SAX

R. Henderikus Jager; John Heise; Willem A. Mels; A. C. Brinkman

doi:10.1117/12.224915

16 October 1995 Wide-field coded-mask x-ray cameras for SAX

R. Henderikus Jager, John Heise, Willem A. Mels, A. C. Brinkman

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Proceedings Volume 2517, X-Ray and EUV/FUV Spectroscopy and Polarimetry; (1995) https://doi.org/10.1117/12.224915
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The two wide field cameras that will be flown on SAX and which we describe here will be used to image the x-ray sky in the energy range from 1.8 to 30 keV. The field of view is 20 degrees at FWHM, the angular resolution is five arcminutes (FWHM), and the energy resolution is 20% at 6 keV, while the source location accuracy is better than one arcminute. The design is based on the coded mask principle where mask and detector both have equal sizes of about 25.6 multiplied by 25.6 cm² square. The detector is a multi wire proportional counter filled with 2.2 bar xenon gas with 5% carbon dioxide, the position resolution is better than 0.5 mm. The mask consists of a 0.1 mm thick stainless steel plate with a hole pattern. The pattern is based on a so called triadic residue set with elements of 1 mm² of which 33% are transparent for x rays. The sensitivity of the WFCs is a few mCrab in 10⁵ seconds. The principle of image reconstruction is presented and some calibration results. Details on the SAX mission and its instruments can be found elsewhere in these proceedings, as well as a detailed description of the detector.

Citation Download Citation

R. Henderikus Jager, John Heise, Willem A. Mels, and A. C. Brinkman "Wide-field coded-mask x-ray cameras for SAX", Proc. SPIE 2517, X-Ray and EUV/FUV Spectroscopy and Polarimetry, (16 October 1995); https://doi.org/10.1117/12.224915

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