S. Ichimaru

NTT (Japan)

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Hisataka Takenaka

Toyama College

Masatoshi Hatayama

NTT (Japan)

Tadayuki Ohchi

NTT (Japan)

Takashi Okajima

Goddard Space Flight Center

Yuzuru Tawara

Nagoya University

Yasushi Ogasaka

Japan Science and Technology Agency

Masahiko Ishino

National Institutes for Quantum and Radiological Science and Technology

Masaharu Nishikino

National Institutes for Quantum and Radiological Science and Technology

P. J. Serlemitsos

Goddard Space Flight Center

Keisuke Tamura

Goddard Space Flight Center

Cooperative Institutions

Nagoya University

The University of Tokyo

Goddard Space Flight Center

Tohoku University

Osaka University

NTT (Japan)

Institute of Space and Astronautical Science

National Institutes for Quantum and Radiological Science and Technology

Kyoto University

University of Hyogo

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

<title>New design concept of multilayer supermirrors for hard x-ray optics</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1999)

Koujun Yamashita Hideyo Kunieda Yuzuru Tawara Keisuke Tamura Yasushi Ogasaka

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.

X-ray optics

Reflection

X-ray telescope

10.1117/12.363646

Cite

Citations (16)

X-Rays from Active Galactic Nuclei — Hard Component

Springer eBooks (1981)

Sachiko Tsuruta F. Takahara S. Ichimaru

10.1007/978-94-010-9949-3_16

Cite

Citations (1)

Multilayer coating for 30.4nm

Review of Scientific Instruments (2005)

Ichiro Yoshikawa Tetsunori Murachi Hisataka Takenaka S. Ichimaru

A multilayer coating of Mo∕Si is usually used for space science in the spectral range of extreme ultraviolet, especially for He-II (30.4nm) radiation, because it is highly stable under vacuum and atmosphere. The fairly high reflectivity of 15%–20% is achieved. But the space science community needs a higher reflective coating at 30.4nm for the future satellite missions. In this work, we report the design of a multilayer, consisting of a pair of Mg and SiC, and its fabrication, and result of the reflectance.

Vacuum ultraviolet

Extreme ultraviolet

Optical coating

Ultraviolet

10.1063/1.1938867

Cite

Citations (31)

Progress and Prospects of X-Ray Laser Research in QST

Masaharu Nishikino Noboru Hasegawa Masahiko Ishino Takashi Imazono Akira Sasaki

This paper reviews recent progress made in the development of coherent x-ray sources and their applications in material science and laser processing in the National Institutes for Quantum and Radiological Science and Technology (QST). The upgrade of Ti:Sapphire laser for a grazing incidence pumping (GRIP) scheme was started, to further develop a coherent x-ray source. Investigating the applications of x-ray lasers, we observed temporal evolution of metal surface ablation using an x-ray laser probe, and the damage to an EUV mirror structure by the x-ray pulse irradiation.

Extreme Ultraviolet Lithography

Upgrade

Laser Ablation

Source

Cite

Citations (0)

Development of Hard X-Ray Telescope Using Multilayer Supermirror

Kouichi Tamura K. Yamashita Yuzuru Tawara Yasushi Ogasaka K. Haga

Source

Cite

Citations (0)

Stroke Signs Detection System by SNS Agency Robot