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Proceedings Paper

The pre-collimator for the ASTRO-H x-ray telescopes: shielding from stray lights
Author(s): Hideyuki Mori; Yoshitomo Maeda; Manabu Ishida; Takuro Sato; Kou Ichihara; Kazuki Tomikawa; Hideyo Kunieda; Yuzuru Tawara; Satoshi Sugita; Tsuyoshi Watanabe; Tatsuharu Torii; Kenji Tachibana; Hisamitsu Awaki; Takashi Okajima; Masayuki Mochida; Eiji Kawabata
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Paper Abstract

We report recent progresses on the fabrication of pre-collimators (PCs). The PCs are designed to mitigate stray lights for X-ray telescopes to be onboard ASTRO-H. Each PC consists of cylindrical aluminum shells (blades) wiht varying radii of 60-225 mm, alignment frames to guilde the blade positions, and the bade housing body. The alignment frame and the housing are made of Aluminum 6061 and 7075 alloy, respectively. Heat-forming process is introduced to the production to stabilize the blade shape in orbit. Precise curvature of radius (tolerance of 1mm) and the linearity along with the direction of incident X-rays (P.V. < 20 microns) ensure that the blades do not obscure the telescope aperature. Each PC blade is placed precisely on top of the respective reflector mirror shell to reduce off-axis X-ray photons that leads to a "ghost" image within the detector field of view. In September 2010, the PC design--its height, thickness, and material of blades--was fixed and we produced the engineering model (EM) for the Soft X-ray Telescopes (SXTs). Since then, vibration tests for the EM PC unit are carried out twice, verifying that the PC has sufficient structural strength to withstand severe conditions during its launch. The EM PC is also installed onto the SXT mirror housing fabricated at the NASA's GSFC to validate our PC assembly method without any loss of thetelescope's effective aperture area. Since August 2011, we have been manusfacturing the PC blades for the flight models. We hereby show the manufacturing processes and also results of stray-light measurement without PCs for the SXT EM (obtained at ISAS 30m beamline facility) and the HXT FM (obtained at SPring-8 synchrotron radiation facility).

Paper Details

Date Published: 10 October 2012
PDF: 8 pages
Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 84435B (10 October 2012); doi: 10.1117/12.925902
Show Author Affiliations
Hideyuki Mori, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Nagoya Univ. (Japan)
Yoshitomo Maeda, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Manabu Ishida, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Takuro Sato, Tokyo Metropolitan Univ. (Japan)
Kou Ichihara, Tokyo Metropolitan Univ. (Japan)
Kazuki Tomikawa, Tokyo Metropolitan Univ. (Japan)
Hideyo Kunieda, Nagoya Univ. (Japan)
Yuzuru Tawara, Nagoya Univ. (Japan)
Satoshi Sugita, Nagoya Univ. (Japan)
Tsuyoshi Watanabe, Nagoya Univ. (Japan)
Tatsuharu Torii, Nagoya Univ. (Japan)
Kenji Tachibana, Nagoya Univ. (Japan)
Hisamitsu Awaki, Ehime Univ. (Japan)
Takashi Okajima, NASA Goddard Space Flight Ctr. (United States)
Masayuki Mochida, Howa Sangyo Co., Ltd. (Japan)
Eiji Kawabata, Photo Precision Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 8443:
Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Stephen S. Murray; Jan-Willem A. den Herder, Editor(s)

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