Supermirror design for Hard X-Ray Telescopes on-board Hitomi (ASTRO-H)

Keisuke Tamura, Hideyo Kunieda, Yusuke Miyata, Takashi Okajima, Takuya Miyazawa, Akihiro Furuzawa, Hisamitsu Awaki, Yoshito Haba, Kazunori Ishibashi, Manabu Ishida, Yoshitomo Maeda, Hideyuki Mori, Yuzuru Tawara, Shigeo Yamauchi, Kentaro Uesugi, Yoshio Suzuki, Hxt Team

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Abstract

We designed depth-graded multilayers, so-called supermirrors, with platinum/carbon (Pt/C) layer pairs for the Hard X-Ray Telescope (HXT) that was on-board the sixth Japanese X-Ray Astronomy Satellite Hitomi (ASTRO-H). The HXT has multinested thin foil optics, and the grazing angles of the X-ray mirrors are 0.07 to 0.27 deg. Supermirrors for HXTs are designed to provide a broad energy response (up to 80 keV) for astronomical requests. Under practical boundary conditions, we establish a block method applying empirical rules to maximize the integrated reflectivity. We fabricated Pt/C supermirrors using a DC magnetron sputtering system. The reflectivity of the mirrors was measured in a synchrotron radiation facility, SPring-8. We describe the design method for the supermirrors and our results.

Original languageEnglish
Article number011209
JournalJournal of Astronomical Telescopes, Instruments, and Systems
Volume4
Issue number1
DOIs
Publication statusPublished - 01-01-2018

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Control and Systems Engineering
  • Instrumentation
  • Astronomy and Astrophysics
  • Mechanical Engineering
  • Space and Planetary Science

Cite this

Tamura, K., Kunieda, H., Miyata, Y., Okajima, T., Miyazawa, T., Furuzawa, A., Awaki, H., Haba, Y., Ishibashi, K., Ishida, M., Maeda, Y., Mori, H., Tawara, Y., Yamauchi, S., Uesugi, K., Suzuki, Y., & Team, H. (2018). Supermirror design for Hard X-Ray Telescopes on-board Hitomi (ASTRO-H). Journal of Astronomical Telescopes, Instruments, and Systems, 4(1), [011209]. https://doi.org/10.1117/1.JATIS.4.1.011209