Dr. Taro Sakao Profile

Dr. Taro Sakao

Associate Professor at Institute of Space and Astronautical Science

SPIE Involvement:

Conference Program Committee | Author

Publications (22)

Proceedings Article | 13 December 2020 Presentation

Development of precision Wolter mirrors towards PhoENiX mission for the Sun

Taro Sakao, Satoshi Matsuyama, Jumpei Yamada, Takato Inoue, Kentaro Hata, Hiroyuki Yamaguchi, Taku Hagiwara, Nami Nakamura, Kazuto Yamauchi, Yoshiki Kohmura, Yoshinori Suematsu, Noriyuki Narukage

Proceedings Volume 11444, 114440O (2020) https://doi.org/10.1117/12.2562077

KEYWORDS: Mirrors, Sun, X-ray imaging, X-rays, Particles, Magnetism, Point spread functions, Spectroscopy, Solar processes, Coronagraphy

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Proceedings Article | 13 December 2020 Presentation

Satellite mission: PhoENiX (Physics of Energetic and Non-thermal plasmas in the X (= magnetic reconnection) region)

Noriyuki Narukage, Mitsuo Oka, Yasushi Fukazawa, Keiichi Matsuzaki, Shin Watanabe, Taro Sakao, Kouichi Hagino, Ikuyuki Mitsuishi, Tsunefumi Mizuno, Iku Shinohara, Masumi Shimojo, Shinsuke Takasao, Hiroshi Tanabe, Munetaka Ueno, Tadayuki Takahashi, Takeshi Takashima, Masayuki Ohta

Proceedings Volume 11444, 1144429 (2020) https://doi.org/10.1117/12.2561341

KEYWORDS: Particles, Satellites, Plasmas, Magnetism, X-ray imaging, Physics, X-rays, Spectroscopes, Imaging spectroscopy, Solar processes

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Proceedings Article | 18 September 2018 Presentation

Precision Wolter mirrors for future x-ray observations of the Sun (Conference Presentation)

Taro Sakao, Satoshi Matsuyama, Takumi Goto, Jumpei Yamada, Takato Inoue, Kentaro Hata, Hiroyuki Yamaguchi, Kazuto Yamauchi, Yoshiki Kohmura, Ayumi Kime, Yoshinori Suematsu, Noriyuki Narukage, Shin-nosuke Ishikawa

Proceedings Volume 10760, 107600B (2018) https://doi.org/10.1117/12.2320861

KEYWORDS: Mirrors, X-rays, Sun, Scattering, Point spread functions, Solar processes, Coronagraphy, X-ray optics, Plasma, Polishing

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Proceedings Article | 19 September 2017 Presentation

Photon counting type imaging spectrometer for solar soft x-rays (Conference Presentation)

Noriyuki Narukage, Shin-nosuke Ishikawa, Tomoko Kawate, Taro Sakao, Lindsay Glesener, Sasha Courtade, Säm Krucker, Steven Christe

Proceedings Volume 10397, 1039709 (2017) https://doi.org/10.1117/12.2274615

KEYWORDS: X-ray imaging, X-rays, Spectroscopy, Solar energy, Cameras, Imaging spectroscopy, Temporal resolution, Photon counting, Coronagraphy, Back illuminated sensors

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Proceedings Article | 23 August 2017 Paper

Development of precision Wolter mirrors for solar x-ray observations

Taro Sakao, Satoshi Matsuyama, Takumi Goto, Jumpei Yamada, Shuhei Yasuda, Kazuto Yamauchi, Yoshiki Kohmura, Ayumi Kime, Akira Miyake, Tadakazu Maezawa, Hirokazu Hashizume, Yoshinori Suematsu, Noriyuki Narukage, Shin-nosuke Ishikawa

Proceedings Volume 10386, 103860E (2017) https://doi.org/10.1117/12.2273507

KEYWORDS: Mirrors, X-rays, X-ray telescopes, Coronagraphy, X-ray imaging, Polishing, X-ray optics, Synchrotrons, X-ray astronomy, Synchrotron x-ray imaging

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High resolution imagery of the Sun's X-ray corona provides an essential clue in understanding dynamics and heating processes of plasma particles there. However, X-ray imagery of the Sun with sub-arcsecond resolution has so far never been conducted due to severe technical difficulty in fabricating precision Wolter mirrors. For future X-ray observations of the solar corona, we are attempting to realize precision Wolter mirrors with sub-arcsecond resolution by adopting advanced surface polish and metrology methods to sector mirrors which consist of a portion of an entire annulus, by direct polishing onto the mirror substrate. Based on the knowledge obtained through fabrication of the first (in 2013) and second (in 2014) engineering Wolter mirrors and subsequent evaluations on their X-ray focusing performance, the third engineering mirror was made in 2015−2016. The primary target of improvement over the second mirror was to suppress figure error amplitude especially for spatial frequencies around 1 mm^-1 and to suppress the large astigmatism that was present in the second mirror, by introducing improved deterministic polish and smoothing on the precision mirror surfaces (32.5 mm × 10 mm in area for both parabola and hyperbola segments), as well as by careful characterization of the systematic error in the figure measurement system for the precision polish. Measurements on the focusing performance of thus-fabricated third Wolter mirror at SPring-8 synchrotron facility with 8 keV X-rays demonstrated that the mirror attained sub-arcsecond focusing performance with its HPD (half-power diameter) size reaching as small as ~0.2 arcsec for meridional focusing while ~0.1 arcsec for sagittal focusing. The meridional focusing achieved nearly diffraction limited performance (~0.12 arcsec FWHM for the PSF core). We also confirmed that the large astigmatism noted in the second mirror was correctly removed in the third mirror with the correction of the above-mentioned systematic error.

Proceedings Article | 2 November 2016 Presentation

Progress in precision Wolter mirrors for soft x-ray observations of the sun (Conference Presentation)

Taro Sakao, Satoshi Matsuyama, Takumi Goto, Kazuto Yamauchi, Yoshiki Kohmura, Yoshinori Suematsu, Noriyuki Narukage

Proceedings Volume 9963, 99630L (2016) https://doi.org/10.1117/12.2237459

KEYWORDS: Mirrors, X-rays, X-ray imaging, Sun, Polishing, Coronagraphy, Image resolution, Solar processes, Point spread functions, X-ray astronomy

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Proceedings Article | 4 September 2015 Paper

Development of precision Wolter mirrors for future solar x-ray observations

Taro Sakao, Satoshi Matsuyama, Ayumi Kime, Takumi Goto, Akihiko Nishihara, Hiroki Nakamori, Kazuto Yamauchi, Yoshiki Kohmura, Akira Miyake, Hirokazu Hashizume, Tadakazu Maezawa, Yoshinori Suematsu, Noriyuki Narukage

Proceedings Volume 9603, 96030U (2015) https://doi.org/10.1117/12.2188905

KEYWORDS: Mirrors, X-rays, Polishing, Coronagraphy, X-ray imaging, Sun, Surface finishing, Point spread functions, Scattering, Solar processes

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Proceedings Article | 24 July 2014 Paper

Current progress of optical alignment procedure of CLASP's Lyman-alpha polarimetry instrument

G. Giono, R. Ishikawa, Y. Katsukawa, T. Bando, R. Kano, Y. Suematsu, N. Narukage, Taro Sakao, K. Kobayashi, F. Auchère

Proceedings Volume 9144, 91443E (2014) https://doi.org/10.1117/12.2055704

KEYWORDS: Telescopes, Mirrors, Spectrographs, Charge-coupled devices, Image quality, Monochromatic aberrations, Optical components, Diffraction gratings, Optical alignment, Space telescopes

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Proceedings Article | 24 July 2014 Paper

The soft x-ray photon-counting telescope for solar observations

Taro Sakao, Noriyuki Narukage, Yoshinori Suematsu, Kyoko Watanabe, Masumi Shimojo, Shinsuke Imada, Shin-nosuke Ishikawa, Edward DeLuca

Proceedings Volume 9144, 91443D (2014) https://doi.org/10.1117/12.2055925

KEYWORDS: Mirrors, X-rays, X-ray telescopes, CMOS sensors, X-ray imaging, Sensors, Coronagraphy, Solar processes, Space telescopes, Magnetism

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Proceedings Article | 26 September 2013 Paper

The soft x-ray photon-counting spectroscopic imager for the sun

Taro Sakao, Noriyuki Narukage, Masumi Shimojo, Kyoko Watanabe, Yoshinori Suematsu, Shinsuke Imada, Shin-nosuke Ishikawa

Proceedings Volume 8862, 88620T (2013) https://doi.org/10.1117/12.2024753

KEYWORDS: X-rays, Mirrors, Magnetism, Plasmas, X-ray imaging, Imaging systems, Electrons, Coronagraphy, Imaging spectroscopy, Solar processes

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Proceedings Article | 25 September 2012 Paper

X-ray performance of e2v’s 0.18 µm CMOS APS test arrays for solar observation

B. Dryer, A. Holland, P. Jerram, Taro Sakao

Proceedings Volume 8453, 84532J (2012) https://doi.org/10.1117/12.926197

KEYWORDS: X-rays, Sensors, X-ray imaging, CMOS sensors, CMOS technology, Spectroscopy, Imaging systems, Back illuminated sensors, Modulation transfer functions, Manganese

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Proceedings Article | 17 September 2012 Paper

Chromospheric Lyman-alpha spectro-polarimeter (CLASP)

Ryouhei Kano, Takamasa Bando, Noriyuki Narukage, Ryoko Ishikawa, Saku Tsuneta, Yukio Katsukawa, Masahito Kubo, Shin-nosuke Ishikawa, Hirohisa Hara, Toshifumi Shimizu, Yoshinori Suematsu, Kiyoshi Ichimoto, Taro Sakao, Motoshi Goto, Yoshiaki Kato, Shinsuke Imada, Ken Kobayashi, Todd Holloway, Amy Winebarger, Jonathan Cirtain, Bart De Pontieu, Roberto Casini, Javier Trujillo Bueno, Jiří Štĕpán, Rafael Manso Sainz, Luca Belluzzi, Andres Asensio Ramos, Frédéric Auchère, Mats Carlsson

Proceedings Volume 8443, 84434F (2012) https://doi.org/10.1117/12.925991

KEYWORDS: Polarization, Magnetism, Mirrors, Coating, Wave plates, Spectrographs, Scattering, Visible radiation, Cameras, Solar processes

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Proceedings Article | 17 September 2012 Paper

The x-ray/EUV telescope for the Solar-C mission: science and development activities

Taro Sakao, Noriyuki Narukage, Shinsuke Imada, Yoshinori Suematsu, Masumi Shimojo, Saku Tsuneta, Edward DeLuca, Kyoko Watanabe, Shin-nosuke Ishikawa

Proceedings Volume 8443, 84430A (2012) https://doi.org/10.1117/12.926850

KEYWORDS: X-ray telescopes, X-rays, Mirrors, Coronagraphy, Space telescopes, Magnetism, Plasma, Telescopes, Spatial resolution, X-ray imaging

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Proceedings Article | 6 October 2011 Paper

Photon-counting soft x-ray telescope for the Solar-C mission

Taro Sakao, Noriyuki Narukage, Masumi Shimojo, Saku Tsuneta, Yoshinori Suematsu, Satoshi Miyazaki, Shinsuke Imada, Naoto Nishizuka, Kyoko Watanabe, Tadayasu Dotani, Edward DeLuca, Shin-nosuke Ishikawa

Proceedings Volume 8148, 81480C (2011) https://doi.org/10.1117/12.893276

KEYWORDS: X-rays, X-ray telescopes, Mirrors, Coronagraphy, Telescopes, Plasmas, Space telescopes, Magnetism, Sensors, Photons

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Proceedings Article | 6 October 2011 Paper

Overview of Chromospheric Lyman-Alpha SpectroPolarimeter (CLASP)

Noriyuki Narukage, Saku Tsuneta, Takamasa Bando, Ryouhei Kano, Masahito Kubo, Ryoko Ishikawa, Hirohisa Hara, Yoshinori Suematsu, Yukio Katsukawa, Hiroko Watanabe, Kiyoshi Ichimoto, Taro Sakao, Toshifumi Shimizu, Ken Kobayashi, Brian Robinson, Tony Kim, Amy Winebarger, Edward West, Jonathan Cirtain, Bart De Pontieu, Roberto Casini, Javier Trujillo Bueno, Jiri Stepan, Rafael Manso Sainz, Luca Belluzzi, Andres Asensio Ramos, Mats Carlsson

Proceedings Volume 8148, 81480H (2011) https://doi.org/10.1117/12.894290

KEYWORDS: Magnetism, Polarization, Magnesium fluoride, Mirrors, Wave plates, Solar processes, Rockets, Spectrographs, Scattering, Telescopes

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Proceedings Article | 6 October 2011 Paper

The SOLAR-C mission: current status

Toshifumi Shimizu, Saku Tsuneta, Hirohisa Hara, Kiyoshi Ichimoto, Kanya Kusano, Taro Sakao, Takashi Sekii, Yoshinori Suematsu, Tetsuya Watanabe

Proceedings Volume 8148, 81480B (2011) https://doi.org/10.1117/12.893228

KEYWORDS: Magnetism, Solar processes, Space telescopes, Coronagraphy, Telescopes, Spectroscopy, Extreme ultraviolet, Sun, Solar energy, Wind energy

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Proceedings Article | 12 October 2004 Paper

Focal plane CCD camera for the X-Ray Telescope (XRT) aboard SOLAR-B

Taro Sakao, Ryouhei Kano, Hirohisa Hara, Keiichi Matsuzaki, Masumi Shimojo, Saku Tsuneta, Takeo Kosugi, Kiyoto Shibasaki, Kazuyoshi Kumagai, Masaki Sawa, Tomonori Tamura, Satoru Iwamura, Mitsuhiko Nakano, Zhangong Du, Kenji Hiyoshi, Michihiro Horii, Leon Golub, Jay Bookbinder, Peter Cheimets, Lawrence Hill, Jerry Owens

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.551742

KEYWORDS: CCD cameras, Charge-coupled devices, Cameras, Quantum efficiency, X-ray telescopes, Plasmas, Electronics, Telescopes, X-rays, Magnetism

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Proceedings Article | 18 December 2000 Paper

High-resolution grazing incidence telescope for the Solar-B observatory

Leon Golub, Edward DeLuca, Jay Bookbinder, Peter Cheimets, Kiyoto Shibasaki, Taro Sakao, Ryouhei Kano

Proceedings Volume 4139, (2000) https://doi.org/10.1117/12.410531

KEYWORDS: Magnetism, Coronagraphy, Telescopes, X-rays, X-ray telescopes, Mirrors, Plasma, Space telescopes, Image filtering, Curium

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Proceedings Article | 28 August 1998 Paper

Development of the tip-tilt mirror system for the solar XUV telescope

Kazuhide Kodeki, Kazuhiko Fukushima, Toshio Kashiwase, Masao Inoue, Toshifumi Shimizu, Tsuyoshi Yoshida, Taro Sakao, Hirohisa Hara, Shin'ichi Nagata, Ryouhei Kano, Saku Tsuneta

Proceedings Volume 3356, (1998) https://doi.org/10.1117/12.324449

KEYWORDS: Rockets, Mirrors, Telescopes, Extreme ultraviolet, Space telescopes, Sun, Actuators, Content addressable memory, Control systems, Control systems design

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Proceedings Article | 11 July 1997 Paper

Development of multilayer mirrors for the XUV Doppler telescope

Shin'ichi Nagata, Hirohisa Hara, Taro Sakao, Toshifumi Shimizu, Saku Tsuneta, Tsuyoshi Yoshida, Wakana Ishiyama, Katsuhiko Murakami, Tetsuya Oshino

Proceedings Volume 3113, (1997) https://doi.org/10.1117/12.278847

KEYWORDS: Mirrors, Reflectivity, Multilayers, Extreme ultraviolet, Doppler effect, Photomasks, Telescopes, Plasma, Silicon, Space telescopes

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Proceedings Article | 11 July 1997 Paper

XUV Doppler telescope with multilayer optics

Hirohisa Hara, Ryouhei Kano, Shin'ichi Nagata, Taro Sakao, Toshifumi Shimizu, Saku Tsuneta, Tsuyoshi Yoshida, Takeo Kosugi

Proceedings Volume 3113, (1997) https://doi.org/10.1117/12.278872

KEYWORDS: Telescopes, Mirrors, Extreme ultraviolet, Reflectivity, Space telescopes, Charge-coupled devices, Rockets, X-ray telescopes, Doppler effect, Iron

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Proceedings Article | 25 November 1996 Paper

Japanese sounding rocket experiment with the solar XUV Doppler telescope

Taro Sakao, Saku Tsuneta, Hirohisa Hara, Ryouhei Kano, Tsuyoshi Yoshida, Shin'ichi Nagata, Toshifumi Shimizu, Takeo Kosugi, Katsuhiko Murakami, Wakuna Wasa, Masao Inoue, Katsuhiro Miura, Koji Taguchi, Kazuo Tanimoto

Proceedings Volume 2804, (1996) https://doi.org/10.1117/12.259721

KEYWORDS: Mirrors, Telescopes, Space telescopes, Extreme ultraviolet, Rockets, Charge-coupled devices, Multilayers, Doppler effect, Solar processes, Coronagraphy

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Showing 5 of 22 publications

Conference Committee Involvement (5)

Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray

16 June 2024 | Yokohama, Japan

Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray

17 July 2022 | Montréal, Québec, Canada

Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray

14 December 2020 | Online Only, California, United States

Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray

13 December 2020 | San Diego, California, United States

Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray

10 June 2018 | Austin, Texas, United States

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