A new mask-antimask coded-aperture telescope for hard X-ray astronomy

Details A new mask-antimask coded-aperture telescope for hard X-ray astronomy A new mask-antimask coded-aperture telescope for hard X-ray astronomy

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991exa.....2..101b&link_type=abstract

Experimental Astronomy (ISSN 0922-6435), vol. 2, no. 2, 1991, p. 101-113. Research supported by CNPq.

Astronomy and Astrophysics

Astronomy

6

Balloon-Borne Instruments, Photomasks, X Ray Astronomy, X Ray Imagery, X Ray Telescopes, Angular Resolution, Computerized Simulation, Irises (Mechanical Apertures), Monte Carlo Method, Sensitivity, Signal To Noise Ratios

Scientific paper

The paper describes a new imaging balloon-borne telescope for hard X-rays in the energy range from 30 to 100 keV. The imaging capability is provided by the use of an extended URA-based coded mask. It is shown that it is possible to rotate, by means of only one motor and suitable stop pins, a carbon-fiber wheel with most of the mask elements attached to it by 180 deg, and a bar, which is also a part of the mask pattern and is allowed to rotate freely over the wheel, by 90 deg. This combined rotation creates an antimask of the original mask, except for the central element. This is a novel and optimal manner of providing an antimask without additional weight and complex mechanical manipulations. It is shown that the use of antimasks is a very effective method of eliminating systematic variations in the background map over the position-sensitive detector area. The expected sensitivity of the instrument for the 30-100-keV range is of the order of 7 x 10 exp -5 photons/sq cm s keV, for an integration time of 10,000 sec at a residual atmosphere of 3.5 g/sq cm.

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