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Proceedings Paper

ASTRO-E2 XRT precollimator for stray light protection: I. Design and expected performance
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Paper Abstract

Next Japanese ASTRO-E2 satellite carries five X-ray telescopes (XRTs), and the pre-collimators for the stray light protection will be installed on them. The pre-collimator is composed of the vertical foil cylinders which line up at the top of the primary reflectors of the XRT. This configuration is effective to reject the stray light of the 'secondary only' reflection, which is the most of the stray light from large off-axis angles up to 70' to the focal plane detector within 18' x 18'. If the height of the pre-collimator is 30 mm (15% of the total height of XRT), we can protect all the "secondary only" component at > 30' off-axis. The field of view will become only about 10% less due to the collimation effect of the 30 mm high pre-collimator. However, new stray light component is generated by the reflection and scattering by the pre-collimator itself, especially at small off-axis angles. As a result, we estimate the total flux of the stray light to be about 10% at 30' off-axis and 5% at 60' off-axis, compared with the case without pre-collimators.

Paper Details

Date Published: 11 March 2003
PDF: 12 pages
Proc. SPIE 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, (11 March 2003); doi: 10.1117/12.461475
Show Author Affiliations
Ryo Shibata, Nagoya Univ. (Japan)
Hideyuki Mori, Institute of Space and Astronautical Science (Japan)
Yoshitomo Maeda, Institute of Space and Astronautical Science (Japan)
Kazutami Misaki, Institute of Space and Astronautical Science (Japan)
Yoshito Haba, Institute of Space and Astronautical Science (Japan)
Kei Itoh, Institute of Space and Astronautical Science (Japan)
Ryo Iizuka, Institute of Space and Astronautical Science (Japan)
Taijiro Morihisa, Institute of Space and Astronautical Science (Japan)
Hideyo Kunieda, Institute of Space and Astronautical Science (Japan)
Akira Hayakawa, Tokyo Metropolitan Univ. (Japan)
Manabu Ishida, Tokyo Metropolitan Univ. (Japan)


Published in SPIE Proceedings Vol. 4851:
X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy
Joachim E. Truemper; Harvey D. Tananbaum, Editor(s)

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