Dr. Kazunori Asakura Profile

Dr. Kazunori Asakura

at Osaka Univ

SPIE Involvement:

Author

Publications (12)

SPIE Journal Paper | 17 May 2023

Multi-image x-ray interferometer module: I. Design concept and proof-of-concept experiments with fine-pitch slits

Kazunori Asakura, Kiyoshi Hayashida, Tomoki Kawabata, Yoneyama Tomokage, Hirofumi Noda, Hironori Matsumoto, Hiroshi Tsunemi, Hiroshi Nakajima, Hisamitsu Awaki, Junko S. Hiraga

JATIS, Vol. 9, Issue 02, 025004, (May 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.2.025004

KEYWORDS: Spatial resolution, X-rays, X-ray imaging, Imaging systems, Interferometers, Design and modelling, X-ray detectors, CMOS sensors, Diffraction, X-ray sources

Read Abstract +

Proceedings Article | 31 August 2022 Presentation + Paper

Sub-arcsecond x-ray imaging with Multi-Image X-ray Interferometer Module (MIXIM): introduction of a periodic coded-aperture mask

Kazunori Asakura, Kiyoshi Hayashida, Shotaro Sakuma, Ayami Ishikura, Kenmei Sawagami, Wataru Kamogawa, Tomokage Yoneyama, Hirofumi Noda, Koki Okazaki, Maho Hanaoka, Kengo Hattori, Yusuke Matsushita, Taisei Mineta, Marina Yoshimoto, Yuichi Ode, Tomohiro Hakamata, Hironori Matsumoto, Hiroshi Tsunemi

Proceedings Volume 12181, 1218129 (2022) https://doi.org/10.1117/12.2629656

KEYWORDS: X-rays, Spatial resolution, X-ray imaging, Coded apertures, Interferometers, Sensors, X-ray detectors, Transmittance, X-ray sources, X-ray astronomy

Read Abstract +

Proceedings Article | 31 August 2022 Presentation + Paper

Xtend, the soft x-ray imaging telescope for the X-Ray Imaging and Spectroscopy Mission (XRISM)

Koji Mori, Hiroshi Tomida, Hiroshi Nakajima, Takashi Okajima, Hirofumi Noda, Takaaki Tanaka, Hiroyuki Uchida, Kouichi Hagino, Shogo Benjamin Kobayashi, Hiromasa Suzuki, Tessei Yoshida, Hiroshi Murakami, Hideki Uchiyama, Masayoshi Nobukawa, Kumiko Nobukawa, Tomokage Yoneyama, Hironori Matsumoto, Takeshi Tsuru, Makoto Yamauchi, Isamu Hatsukade, Manabu Ishida, Yoshitomo Maeda, Takayuki Hayashi, Keisuke Tamura, Rozenn Boissay-Malaquin, Toshiki Sato, Junko Hiraga, Takayoshi Kohmura, Kazutaka Yamaoka, Tadayasu Dotani, Masanobu Ozaki, Hiroshi Tsunemi, Yoshiaki Kanemaru, Jin Sato, Toshiyuki Takaki, Yuta Terada, Keitaro Miyazaki, Kohei Kusunoki, Yoshinori Otsuka, Haruhiko Yokosu, Wakana Yonemaru, Yoh Asahina, Kazunori Asakura, Marina Yoshimoto, Yuichi Ode, Junya Sato, Tomohiro Hakamata, Mio Aoyagi, Yuma Aoki, Shun Tsunomachi, Toshiki Doi, Daiki Aoki, Kaito Fujisawa, Masatoshi Kitajima, Kiyoshi Hayashida

Proceedings Volume 12181, 121811T (2022) https://doi.org/10.1117/12.2626894

KEYWORDS: Charge-coupled devices, X-rays, X-ray imaging, Calibration, CCD cameras, Imaging spectroscopy, Spectroscopy, Cameras, Space operations, Aluminum

Read Abstract +

SPIE Journal Paper | 6 January 2021 Open Access

Measuring the atomic scattering factors near the iridium L-edges for the Athena silicon pore optics reflector

Hisamitsu Awaki, Yoshitomo Maeda, Hironori Matsumoto, Sara Svendsen, Marcos Bavdaz, Maximilien Collon, Kazunori Asakura, Finn Christensen, Desiree D. Ferreira, Matteo Guainazzi, Masato Hoshino, Shuntaro Ide, Kazunori Ishibashi, Wansu Kan, Sonny Massahi, Takuya Miyazawa, Sadayuki Shimizu, Brian Shortt, Yusuke Takehara, Keisuke Tamura, Kentaro Uesugi, Richard Willingale, Tomokage Yoneyama, Atsushi Yoshida

JATIS, Vol. 7, Issue 01, 014001, (January 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.1.014001

KEYWORDS: Iridium, X-rays, Scattering, Reflectivity, Mirrors, Data modeling, Error analysis, Surface roughness, Silicon, X-ray telescopes

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 18 December 2020 Presentation + Paper

Sub-arcseconds to micro-arcsecond x-ray imaging with multi image x-ray interferometer method (MIXIM): concept and scalabe mission plans

Kiyoshi Hayashida, Kazunori Asakura, Ayami Ishikura, Shotaro Sakuma, Takashi Hanasaka, Tomoki Kawabata, Tomokage Yoneyama, Hirofumi Noda, Koki Okazaki, Maho Hanaoka, Kengo Hattori, Kenmei Sawagami, Wataru Kamogawa, Hiroshi Nakajima, Yusuke Matsuhita, Taisei Mineta, Marina Yoshimoto, Tomohiko Hakamata, Yuichi Ode, Hironori Matsumoto, Hiroshi Tsunemi, Hisamitsu Awaki, Yuichi Terashima, Toshihiro Kawaguchi

Proceedings Volume 11444, 114441C (2020) https://doi.org/10.1117/12.2562193

KEYWORDS: X-ray imaging, X-rays, Interferometers, Diffraction gratings, Sensors, Image resolution, Spatial resolution, Satellites, Astronomy, Visibility

Read Abstract +

Proceedings Article | 13 December 2020 Poster + Paper

New method to make a smooth surface on Carbon Fiber Reinforced Plastic (CFRP) substrate

H. Awaki, N. Aida, K. Asakura, M. Hanaoka, K. Hattori, K. Ishibashi, M. Ishida, A. Ishikura, Y. Maeda, H. Matsumoto, Y. Matsushita, T. Mineta, I. Mitsuishi, T. Miyazawa, N. Nakaniwa, K. Nakazawa, Y. Ode, C. Oue, K. Sawagami, S. Sugita, H. Suzuki, H. Takahashi, Y. Uchida, R. Yamamoto, M. Yoshimoto

Proceedings Volume 11444, 114447P (2020) https://doi.org/10.1117/12.2561890

KEYWORDS: Mirrors, Carbon, Surface roughness, X-rays, Reflectivity, Composites, Aerospace engineering, Lightweight mirrors, Glasses, Image quality

Read Abstract +

Proceedings Article | 13 December 2020 Presentation + Paper

Soft x-ray imager (SXI) for Xtend onboard X-Ray Imaging and Spectroscopy Mission (XRISM)

Hiroshi Nakajima, Kiyoshi Hayashida, Hiroshi Tomida, Koji Mori, Hirofumi Noda, Hironori Matsumoto, Tomokage Yoneyama, Koki Okazaki, Kazunori Asakura, Maho Hanaoka, Kengo Hattori, Ayami Ishikura, Shotaro Sakuma, Takaaki Tanaka, Hiroyuki Uchida, Takeshi Tsuru, Yuki Amano, Hiromichi Okon, Makoto Yamauchi, Isamu Hatsukade, Yusuke Nishioka, Yoshiaki Kanemaru, Jin Sato, Toshiyuki Takaki, Yuta Terada, Tessei Yoshida, Takayoshi Kohmura, Kouichi Hagino, Shogo Kobayashi, Hiroshi Murakami, Hikari Kashimura, Hideki Uchiyama, Kazutaka Yamaoka, Masayoshi Nobukawa, Takashi Sako, Kumiko Nobukawa, Mariko Saito, Junko Hiraga, Yukino Urabe, Masayuki Yoshida, Tadayasu Dotani, Masanobu Ozaki, Hiroshi Tsunemi

Proceedings Volume 11444, 1144423 (2020) https://doi.org/10.1117/12.2560348

KEYWORDS: X-ray imaging, Charge-coupled devices, Imaging spectroscopy, Spectroscopy, X-rays, X-ray telescopes, CCD image sensors, Fermium, Frequency modulation, CCD cameras

Read Abstract +

Proceedings Article | 13 December 2020 Presentation + Paper

On-ground calibration of XRISM/Xtend CCD

Tomokage Yoneyama, Hirofumi Noda, Maho Hanaoka, Kiyoshi Hayashida, Koki Okazaki, Kazunori Asakura, Yoshiaki Kanemaru, Jin Sato, Toshiyuki Takaki, Koji Mori, Takashi Sako, Masayoshi Nobukawa, Mariko Saito, Kumiko Nobukawa, Hiroshi Murakami, Yuki Amano, Hiroyuki Uchida, Hideki Uchiyama, Hiroshi Tomida, Hiroshi Nakajima, Kengo Hattori, Shotaro Sakuma, Ayami Ishikura, Hironori Matsumoto, Hiromichi Okon, Takaaki Tanaka, Takeshi Tsuru, Yukino Urabe, Junko Hiraga, Akira Kashimura, Shogo Kobayashi, Kouichi Hagino

Proceedings Volume 11444, 1144425 (2020) https://doi.org/10.1117/12.2561524

KEYWORDS: Charge-coupled devices, Calibration, X-rays, X-ray imaging, Fermium, Frequency modulation, X-ray telescopes, X-ray sources, Imaging spectroscopy, Spectroscopes

Read Abstract +

Proceedings Article | 13 December 2020 Presentation + Paper

Subsub-arcseconds x-ray imaging with multi-image x-ray interferometer module (MIXIM): experimental results

Kazunori Asakura, Kiyoshi Hayashida, Takashi Hanasaka, Tomoki Kawabata, Tomokage Yoneyama, Hirofumi Noda, Shotaro Sakuma, Koki Okazaki, Ayami Ishikura, Maho Hanaoka, Shuntaro Ide, Kengo Hattori, Hironori Matsumoto, Hiroshi Tsunemi, Hisamitsu Awaki, Hiroshi Nakajima, Junko Hiraga

Proceedings Volume 11444, 114441D (2020) https://doi.org/10.1117/12.2560772

KEYWORDS: X-rays, X-ray imaging, X-ray detectors, Interferometers, CMOS sensors, Diffraction gratings, X-ray astronomy, Sensors, Spatial resolution, Astronomy

Read Abstract +

SPIE Journal Paper | 6 June 2019

X-ray imaging polarimetry with a 2.5-μm pixel CMOS sensor for visible light at room temperature

Kazunori Asakura, Kiyoshi Hayashida, Takashi Hanasaka, Tomoki Kawabata, Tomokage Yoneyama, Koki Okazaki, Shuntaro Ide, Hirofumi Noda, Hironori Matsumoto, Hiroshi Tsunemi, Hisamitsu Awaki, Hiroshi Nakajima

JATIS, Vol. 5, Issue 03, 035002, (June 2019) https://doi.org/10.1117/12.10.1117/1.JATIS.5.3.035002

KEYWORDS: X-rays, Polarimetry, X-ray detectors, Sensors, X-ray imaging, CMOS sensors, Polarization, Visible radiation, X-ray astronomy, Charge-coupled devices

Read Abstract +

Proceedings Article | 10 July 2018 Presentation + Paper

Sub-arcsecond imaging with multi-image x-ray interferometer module (MIXIM) for very small satellite

Kiyoshi Hayashida, Tomoki Kawabata, Takashi Hanasaka, Kazunori Asakura, Tomokage Yoneyama, Koki Okazaki, Shuntaro Ide, Hironori Matsumoto, Hiroshi Nakajima, Hisamitsu Awaki, Hiroshi Tsunemi

Proceedings Volume 10699, 106990U (2018) https://doi.org/10.1117/12.2314181

KEYWORDS: X-rays, Sensors, X-ray detectors, X-ray imaging, Interferometers, X-ray sources, CMOS sensors, Satellites, Interferometry, Collimators

Read Abstract +

We have proposed a new type of X-ray interferometer called Multi Image X-ray Interferometer Module (MIXIM) consisting simply of a grating and an X-ray spectral imaging detector. The baseline concept of MIXIM is a slit camera to obtain the profile of X-ray sources, but aim to get a sub-arcsecond resolution. For that purpose, to avoid blurring of the image by diffraction is a key, and we select X-ray events of which energy satisfies the interferometric condition called Talbot effect. Stacking the images (X-ray interferometric fringes) with the period of the grating is another point of the method, which provides the self image of a grating slit convolved with the profile of the X-ray source. We started an experiment with a micro focus X-ray source, 4.8 μm pitch grating, and an SOI type X-ray detector XRPIX2b with a pixel size of 30 μm. The stacked self image was obtained with a magnification factor of 4.4. We, however, need finer positional resolution for the detector to obtain the self image to a parallel beam, for which the magnification factor must be 1. We thus focused on small pixel size CMOS sensors developed for visible light. We irradiated X-rays to one of such CMOS sensors GSENSE5130 with a pixel size of 4.25 μm, and found enough capability to detect X-rays, i.e., FWHM of 207 eV at 5.9 keV at room temperature. We then employed this sensor and performed an experiment at a 200 m beam line of BL20B2 in the synchrotron facility SPring8. Using a grating with a pitch of 4.8 µm and an opening fraction of f=0.5, we obtained the self image of the grating at the detector distance from the grating of 23 cm and 46 cm and the X-ray energy of 12.4 keV. We also performed an experiment using a 9.6 μm f = 0.2 grating with a detector-grating distance of 92 cm, and obtained higher contrast image of the grating. Note that the slit width of 2.4 μm at 46 cm corresponds to 1.1′′, while that of 1.9 μm at 92 cm does 0.43′′. We suggest several format of possible MIXIM missions, including MIXIM-S for very small satellite of 50cm size, MIXIM-P for parasite use of nominal X-ray observatory employing grazing X-ray telescopes with a focal length of 10 m, and MIXIM-Z in which the grating-detector distance of 100 m is acquired by formation flight or free fryers to yield 0.01” level resolution.

Proceedings Article | 10 July 2018 Presentation + Paper

Soft x-ray imaging telescope (Xtend) onboard X-ray Astronomy Recovery Mission (XARM)

Kiyoshi Hayashida, Hiroshi Tomida, Koji Mori, Hiroshi Nakajima, Takaaki Tanaka, Hiroyuki Uchida, Takeshi Tsuru, Hiroshi Murakami, Takashi Okajima, Takayoshi Kohmura, Kouichi Hagino, Shogo Kobayashi, Manabu Ishida, Yoshitomo Maeda, Hideki Uchiyama, Kazutaka Yamaoka, Hironori Matsumoto, Masayoshi Nobukawa, Kumiko Nobukawa, Junko Hiraga, Makoto Yamauchi, Isamu Hatsukade, Yang Soong, Hideyuki Mori, Takayuki Hayashi, Hiroshi Tsunemi, Masanobu Ozaki, Tadayasu Dotani, Junichi Iwagaki, Tomokage Yoneyama, Koki Okazaki, Kazunori Asakura, Satomi Onishi, Yoshiaki Kanemaru, Jin Sato, Yusuke Nishioka, Ayaki Takeda, Hiromichi Okon, Masayuki Yoshida, Takeo Shimoi

Proceedings Volume 10699, 1069923 (2018) https://doi.org/10.1117/12.2311446

KEYWORDS: Charge-coupled devices, X-rays, Aluminum, X-ray telescopes, Coating, X-ray imaging, Mirrors, Satellites, Electronics, Fermium

Read Abstract +

Showing 5 of 12 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years