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29 September 1999 New design concept of multilayer supermirrors for hard x-ray optics
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Abstract
It is important to enhance the reflectivity of multilayer supermirrors in 10-100 keV region used for hard x-ray optical systems. For this purpose design methods of multilayer supermirrors have been investigated at the grazing angle of 0.3 degrees by means of the x-ray etalon or phase matching configuration. It means that the 1st and higher order Bragg reflections emanated from different periodic lengths cooperatively enhance the reflectivity at energy bands concerned. The x-ray etalons method is useful for multi-band mirror with the band width of 5 keV or so, but becomes a bit difficult to make the energy band wider connecting gaps between isolated bands. Because heavy oscillation of reflectivity curve occurs due to adjacent destructive and constructive interference. The phase matching method is useful to get smooth reflectivity in the broad energy band and is possible to enhance the 2nd order Bragg reflection in higher energy region. We present the design of hard x-ray telescope sensitive in 25-40 keV region by means of multi-block supermirrors of Pt/C multilayers. The effective area was obtained to be more than 100 cm2.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Koujun Yamashita, Hideyo Kunieda, Yuzuru Tawara, Keisuke Tamura, Yasushi Ogasaka, Kazutoshi Haga, Takashi Okajima, Y. Hidaka, Satoshi Ichimaru, S. Takahashi, Arifumi Gotou, Hideo Kitou, Yoshiyuki Tsusaka, K. Yokoyama, and S. Takeda "New design concept of multilayer supermirrors for hard x-ray optics", Proc. SPIE 3766, X-Ray Optics, Instruments, and Missions II, (29 September 1999); https://doi.org/10.1117/12.363646
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