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Proceedings Paper

Design of the pre-collimator for the NeXT x-ray telescopes
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Paper Abstract

We present the design of the pre-collimator for the X-ray telescopes (XRTs) onboard New X-ray Telescope (NeXT). The optical design adopted for the NeXT XRTs is conically-approximated Wolter-I type optics. The tightly-nested reflectors with thin substrates (150-300 μm) enable us to achieve the large effective area and extremely light weight simultaneously. However, due to the packed reflector shells, X-rays from the outside of the XRT field of view occasionally arrive at the focal plane without the normal double reflection (stray lights), and then produce a ghost image on the detector. Thus, the stray-lights contamination degrades sensitivity of the source detection In order to reduce the stray lights efficiently, we plan to mount a collimator onto each telescope (referred to as pre-collimator), which is similar to that equipped with the Suzaku XRTs. The pre-collimator consists of coaxially-nested cylindrical blades, each of which is aligned radially with the corresponding primary refector. We found the height of the pre-collimator blade to be ~100 mm that is required to block the X-rays with off-axis angles of 30'-50', which are the main ligth pass of the stray lights for the NeXT XRTs.

Paper Details

Date Published: 15 July 2008
PDF: 10 pages
Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70112W (15 July 2008); doi: 10.1117/12.789184
Show Author Affiliations
Hideyuki Mori, ISAS/JAXA (Japan)
Yasushi Ogasaka, Nagoya Univ. (Japan)
Manabu Ishida, ISAS/JAXA (Japan)
Yoshitomo Maeda, ISAS/JAXA (Japan)
Keisuke Tamura, ISAS/JAXA (Japan)
Hideyo Kunieda, Nagoya Univ. (Japan)
Akihiro Furuzawa, Nagoya Univ. (Japan)
Yoshito Haba, Nagoya Univ. (Japan)
Takuya Miyazawa, Nagoya Univ. (Japan)
Koujun Yamashita, Nagoya Univ. (Japan)
Hisamitsu Awaki, Ehime Univ. (Japan)
Peter J. Serlemitsos, NASA Goddard Space Flight Ctr. (United States)
Yang Soong, NASA Goddard Space Flight Ctr. (United States)
Kai-Wing Chan, NASA Goddard Space Flight Ctr. (United States)
Takashi Okajima, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 7011:
Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray
Martin J. L. Turner; Kathryn A. Flanagan, Editor(s)

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