SIMBOL-X: the problem of the calibrating a 0.5-80 keV 20m focal length focussing telescope

Details SIMBOL-X: the problem of the calibrating a 0.5-80 keV 20m focal length focussing telescope SIMBOL-X: the problem of the calibrating a 0.5-80 keV 20m focal length focussing telescope

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007spie.6688e..17b&link_type=abstract

Optics for EUV, X-Ray, and Gamma-Ray Astronomy III. Edited by O'Dell, Stephen L.; Pareschi, Giovanni. Proceedings of the SPIE, V

Physics

Optics

Scientific paper

Simbol-X is a hard X-ray telescope being developed by France and Italy, with the participation of Germany, that will operate in the 0.5-80 keV. Simbol-X will allow, in the key 10-40 keV band, a two order of magnitude leap both in sensitivity and angular resolution, by means of a hybrid focal plane coupled with a 20m focal length multi-layer coated X-ray mirrors. The novel telescope architecture and its three-decade extended energy band translate however into technical issues never addressed before for what concerns the on-ground calibrations. In fact, at least in the full-illumination geometry, the unprecedented focal length causes, due to the calibration source finite distance, two main problems: (a) a non-negligible increase of the fraction of incident photons undergoing only one reflection (in the parabola); (b) a variation of the reflectivity curve between parabola and hyperbola, due to a corresponding variation of the incidence angle of incoming photons. In this work, the issue of calibrating a 20m X-ray focussing telescope is addressed in details, and technical solutions are envisaged and proposed to tackle and minimized the above mentioned problems.

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