20 September 2007 SIMBOL-X: the problem of the calibrating a 0.5-80 keV 20m focal length focussing telescope
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Abstract
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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. Basso, S. Basso, D. Spiga, D. Spiga, G. Pareschi, G. Pareschi, O. Citterio, O. Citterio, G. Malaguti, G. Malaguti, W. Burkert, W. Burkert, M. Freyberg, M. Freyberg, } "SIMBOL-X: the problem of the calibrating a 0.5-80 keV 20m focal length focussing telescope", Proc. SPIE 6688, Optics for EUV, X-Ray, and Gamma-Ray Astronomy III, 66880J (20 September 2007); doi: 10.1117/12.733979; https://doi.org/10.1117/12.733979
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