Mirror module design of x-ray telescopes of eXTP mission

S. Basso; M. Civitani; G. Pareschi; G. Sironi; D. Spiga; G. Tagliaferri; J. Wang; Y. Yang; Y. Xu; Y. Chen; L. Sheng; Y. Yan; P. Qiang; B. Zhao

doi:10.1117/12.2530807

9 September 2019 Mirror module design of x-ray telescopes of eXTP mission

S. Basso, M. Civitani, G. Pareschi, G. Sironi, D. Spiga, G. Tagliaferri, J. Wang, Y. Yang, Y. Xu, Y. Chen, L. Sheng, Y. Yan, P. Qiang, B. Zhao

Author Affiliations +

Proceedings Volume 11119, Optics for EUV, X-Ray, and Gamma-Ray Astronomy IX; 1111904 (2019) https://doi.org/10.1117/12.2530807
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

The eXTP (enhanced X-Ray Timing and Polarimetry) mission is a Chinese science space mission developed in collaboration with many international countries. Devoted to observations in the X-ray band, with imaging, spectroscopic, timing and polarimetry capabilities, is now entering phase B. The payload includes 9 Spectroscopic Focusing Array (SFA) and 4 Polarimetry Focusing Array (PFA) telescopes. The SFA telescopes, equipped with SDDs, have a spatial resolution of 1 arcmin, while the PFA telescopes, equipped with imaging gas pixel photoelectric polarimeters, have a spatial resolution of 30 arcsec. Both optics work in the 0.5-10 keV range with a focal length of 5.25 m and a field of view of 12 arcmin. The technology used for the optics production is Nickel electroforming from super-polished mandrels, like many previous successful X-ray missions. The reflecting coating is a double layer Au+C, which ensures optimal response at high and low energies. The PFA and SFA have the same optical design, in order to minimize the number of mandrels to be produced. In this paper, we present the optical design of these telescopes assisted with raytracing and a preliminary concept for the mechanical design supported by FEM simulation.

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S. Basso, M. Civitani, G. Pareschi, G. Sironi, D. Spiga, G. Tagliaferri, J. Wang, Y. Yang, Y. Xu, Y. Chen, L. Sheng, Y. Yan, P. Qiang, and B. Zhao "Mirror module design of x-ray telescopes of eXTP mission", Proc. SPIE 11119, Optics for EUV, X-Ray, and Gamma-Ray Astronomy IX, 1111904 (9 September 2019); https://doi.org/10.1117/12.2530807

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