《Table 3 PFA main specifications》

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《The enhanced X-ray Timing and Polarimetry mission—eXTP》

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Since they are based on very similar concepts in this section we discuss the optics of both the SFA and PFA.Thirteen X-ray grazing-incidence Wolter-I（parabola+hyperbola）optics modules will be implemented onboard eXTP.The SFA includes nine optics modules while four optics modules are designed for the PFA.The expected collecting area of each telescope is at 2 keV，and at 6 ke V.The FoV is 12 arcmin（in diameter）.These figures already meet the requirement of～820 cm2at 2 keV1) .The requirement for the angular resolution of the PFA optics is<30 arcsec（HEW，goal is 15 arcsec），more demanding than the 1 arcmin（HEW）angular resolution required for the SFA optics.For both types of telescopes the focal length reference value is 525 cm.The maximum diameter of the mirror shells，allowed by the envelope for a single mirror of less than 600 mm in diameter，is about 510 mm.The weight of the optics module is expected to be～50 kg for the SFA and～100 kg for the PFA.In Table 1 we list the main parameters of the SFA and PFA optics.