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

Hideyuki Mori; Yasushi Ogasaka; Manabu Ishida; Yoshitomo Maeda; Keisuke Tamura; Hideyo Kunieda; Akihiro Furuzawa; Yoshito Haba; Takuya Miyazawa; Koujun Yamashita; Hisamitsu Awaki; Peter J. Serlemitsos; Yang Soong; Kai-Wing Chan; Takashi Okajima

doi:10.1117/12.789184

15 July 2008 Design of the pre-collimator for the NeXT x-ray telescopes

Hideyuki Mori, Yasushi Ogasaka, Manabu Ishida, Yoshitomo Maeda, Keisuke Tamura, Hideyo Kunieda, Akihiro Furuzawa, Yoshito Haba, Takuya Miyazawa, Koujun Yamashita, Hisamitsu Awaki, Peter J. Serlemitsos, Yang Soong, Kai-Wing Chan, Takashi Okajima

Author Affiliations +

Proceedings Volume 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray; 70112W (2008) https://doi.org/10.1117/12.789184
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

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Hideyuki Mori, Yasushi Ogasaka, Manabu Ishida, Yoshitomo Maeda, Keisuke Tamura, Hideyo Kunieda, Akihiro Furuzawa, Yoshito Haba, Takuya Miyazawa, Koujun Yamashita, Hisamitsu Awaki, Peter J. Serlemitsos, Yang Soong, Kai-Wing Chan, and Takashi Okajima "Design of the pre-collimator for the NeXT x-ray telescopes", Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70112W (15 July 2008); https://doi.org/10.1117/12.789184

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