Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-08-31
Astronomy and Astrophysics
Astrophysics
10 pages, 10 figures, appears in the SPIE 2004 proceedings (5540: Hard X-ray and gamma-ray detector physics V)
Scientific paper
10.1117/12.559650
The proposed black-hole finder mission EXIST will consist of multiple wide-field hard X-ray coded-aperture telescopes. The high science goals set for the mission require innovations in telescope design. In particular, wide energy band coverage and fine angular resolution require relatively thick coded masks and thick detectors compared to their pixel size, which may introduce mask self-collimation and depth-induced image blurring with conventional design approaches. Previously we proposed relatively simple solutions to these potential problems: radial hole for mask selfcollimation and cathode depth sensing detector for image blurring. We have now performed laboratory experiments to explore the potential of these two techniques. The experimental results show that the radial hole mask greatly alleviates mask self-collimation and a ~1 mm resolution depth-sensitive detector scheme can be relatively easily achieved for the large scale required for EXIST.
Bellm Eric C.
Grindlay Jonathon E.
Hong Jongbae
Narita Taku
Noss J.
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