Paper
10 October 2012 The pre-collimator for the ASTRO-H x-ray telescopes: shielding from stray lights
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
Author Affiliations +
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).
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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, and Eiji Kawabata "The pre-collimator for the ASTRO-H x-ray telescopes: shielding from stray lights", Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 84435B (10 October 2012); https://doi.org/10.1117/12.925902
Lens.org Logo
CITATIONS
Cited by 4 scholarly publications.
Advertisement
Advertisement
RIGHTS & PERMISSIONS
Get copyright permission  Get copyright permission on Copyright Marketplace
KEYWORDS
X-rays

X-ray telescopes

Aluminum

Mirrors

Stray light

Reflection

X-ray imaging

RELATED CONTENT

The ASTRO H SXT performance to the large off set...
Proceedings of SPIE (July 18 2016)
X ray calibration of telescopes on board the ASTRO E...
Proceedings of SPIE (November 19 1998)
Simbol-X: x-ray baffle for stray-light reduction
Proceedings of SPIE (September 20 2007)
Design of the pre collimator for the NeXT x ray...
Proceedings of SPIE (July 15 2008)

Back to Top