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Atsushi Sunahara
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Journal Articles

Efficient extreme ultraviolet emission by multiple laser pulses

Open Access
Tsukasa Sugiura, Hayato Yazawa, Hiroki Morita, Kazuyuki Sakaue, Daisuke Nakamura, Eiji J. Takahashi, Atsushi Sunahara, Gerry O'Sullivan, Shinichi Namba, Takeshi Higashiguchi
Journal: Applied Physics Letters
Appl. Phys. Lett. 125, 034103 (2024)
https://doi.org/10.1063/5.0214952
Published: July 2024
View articletitled, Efficient extreme ultraviolet emission by multiple laser pulses
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Journal Articles

Absolute density measurement of hydrogen radicals in XUV induced plasma for tin contamination cleaning via laser-induced fluorescence

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Nozomi Tanaka, Baojun Zhu, Chang Liu, Yubo Wang, Katsunobu Nishihara, James Edward Hernandez, Tomoyuki Johzaki, Atsushi Sunahara, Kyung Sik Kang, Shinji Ueyama, Ken Ozawa, Shinsuke Fujioka
Journal: Applied Physics Letters
Appl. Phys. Lett. 124, 152113 (2024)
https://doi.org/10.1063/5.0189605
Published: April 2024
View articletitled, Absolute density measurement of hydrogen radicals in XUV induced plasma for tin contamination cleaning via laser-induced fluorescence
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Includes: Supplementary data
Journal Articles

Efficient photo-dissociation-induced production of hydrogen radicals using vacuum ultraviolet light from a laser-produced plasma

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James Edward Hernandez, Nozomi Tanaka, Ryuya Yamada, Yubo Wang, Katsunobu Nishihara, Tomoyuki Johzaki, Atsushi Sunahara, Kyung Sik Kang, Shinji Ueyama, Ken Ozawa, Shinsuke Fujioka
Journal: Applied Physics Letters
Appl. Phys. Lett. 124, 012101 (2024)
https://doi.org/10.1063/5.0186829
Published: January 2024
View articletitled, Efficient photo-dissociation-induced production of hydrogen radicals using vacuum ultraviolet light from a laser-produced plasma
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Includes: Supplementary data
Journal Articles

Charge-separated spectra of suprathermal highly charged bismuth ions in a dual laser-produced plasma soft x-ray source

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Hiromu Kawasaki, Toshiki Tamura, Atsushi Sunahara, Masaharu Nishikino, Shinichi Namba, Gerry O’Sullivan, Takeshi Higashiguchi
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 91, 086103 (2020)
https://doi.org/10.1063/5.0012225
Published: August 2020
View articletitled, Charge-separated spectra of suprathermal highly charged bismuth ions in a dual laser-produced plasma soft x-ray source
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Journal Articles

Electron temperature and soft x-ray intensity scaling in laser heavy element plasma interaction

FeaturedOpen Access
Hiromu Kawasaki, Atsushi Sunahara, Yuta Shimada, Takeo Ejima, Weihua Jiang, Gerry O’Sullivan, Masaharu Nishikino, Shinichi Namba, Takeshi Higashiguchi
Journal: AIP Advances
AIP Advances 10, 065306 (2020)
https://doi.org/10.1063/5.0009946
Published: June 2020
View articletitled, Electron temperature and soft x-ray intensity scaling in laser heavy element plasma interaction
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Journal Articles

Optimized highly charged ion production for strong soft x-ray sources obeying a quasi-Moseley’s law

Editor’s PickOpen Access
Yuta Shimada, Hiromu Kawasaki, Kanon Watanabe, Hiroyuki Hara, Kyoya Anraku, Misaki Shoji, Toru Oba, Masaru Matsuda, Weihua Jiang, Atsushi Sunahara, Masaharu Nishikino, Shinichi Namba, Gerry O’Sullivan, Takeshi Higashiguchi
Journal: AIP Advances
AIP Advances 9, 115315 (2019)
https://doi.org/10.1063/1.5127943
Published: November 2019
View articletitled, Optimized highly charged ion production for strong soft x-ray sources obeying a quasi-Moseley’s law
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Journal Articles

Kinetic model for color-center formation in TiO2 film using femtosecond laser irradiation

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Susumu Kato, Atsushi Sunahara, Masahiro Tsukamoto
Journal: Journal of Vacuum Science & Technology A
J. Vac. Sci. Technol. A 37, 031512 (2019)
https://doi.org/10.1116/1.5085822
Published: April 2019
View articletitled, Kinetic model for color-center formation in TiO2 film using femtosecond laser irradiation
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Journal Articles

Numerical analysis of pulsed magnetic field diffusion dynamics in gold cone target

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Hiroki Morita, Atsushi Sunahara, Yasunobu Arikawa, Hiroshi Azechi, Shinsuke Fujioka
Journal: Physics of Plasmas
Phys. Plasmas 25, 094505 (2018)
https://doi.org/10.1063/1.5050845
Published: September 2018
View articletitled, Numerical analysis of pulsed magnetic field diffusion dynamics in gold cone target
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Journal Articles

A numerical model for investigation of emission of particle debris from laser-irradiated metal targets

Open Access
Akira Sasaki, Atsushi Sunahara, Katsunobu Nishihara, Takeshi Nishikawa
Journal: AIP Advances
AIP Advances 7, 095005 (2017)
https://doi.org/10.1063/1.4991398
Published: September 2017
View articletitled, A numerical model for investigation of emission of particle debris from laser-irradiated metal targets
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Journal Articles

Investigation of the ionization balance of bismuth-to-tin plasmas for the extreme ultraviolet light source based on a computer-generated collisional radiative model

Open Access
Akira Sasaki, Atsushi Sunahara, Katsunobu Nishihara, Takeshi Nishikawa
Journal: AIP Advances
AIP Advances 6, 105002 (2016)
https://doi.org/10.1063/1.4964496
Published: October 2016
View articletitled, Investigation of the ionization balance of bismuth-to-tin plasmas for the extreme ultraviolet light source based on a computer-generated collisional radiative model
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Journal Articles

Fast ignition realization experiment with high-contrast kilo-joule peta-watt LFEX laser and strong external magnetic field

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Shinsuke Fujioka, Yasunobu Arikawa, Sadaoki Kojima, Tomoyuki Johzaki, Hideo Nagatomo, Hiroshi Sawada, Seung Ho Lee, Takashi Shiroto, Naofumi Ohnishi, Alessio Morace, Xavier Vaisseau, Shohei Sakata, Yuki Abe, Kazuki Matsuo, King Fai Farley Law, Shota Tosaki, Akifumi Yogo, Keisuke Shigemori, Yoichiro Hironaka, Zhe Zhang, Atsushi Sunahara, Tetsuo Ozaki, Hitoshi Sakagami, Kunioki Mima, Yasushi Fujimoto, Kohei Yamanoi, Takayoshi Norimatsu, Shigeki Tokita, Yoshiki Nakata, Junji Kawanaka, Takahisa Jitsuno, Noriaki Miyanaga, Mitsuo Nakai, Hiroaki Nishimura, Hiroyuki Shiraga, Kotaro Kondo, Mathieu Bailly-Grandvaux, Claudio Bellei, João Jorge Santos, Hiroshi Azechi
Journal: Physics of Plasmas
Phys. Plasmas 23, 056308 (2016)
https://doi.org/10.1063/1.4948278
Published: May 2016
View articletitled, Fast ignition realization experiment with high-contrast kilo-joule peta-watt LFEX laser and strong external magnetic field
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Journal Articles

Numerical evaluation of a 13.5-nm high-brightness microplasma extreme ultraviolet source

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Hiroyuki Hara, Goki Arai, Thanh-Hung Dinh, Weihua Jiang, Taisuke Miura, Akira Endo, Takeo Ejima, Bowen Li, Padraig Dunne, Gerry O'Sullivan, Atsushi Sunahara, Takeshi Higashiguchi
Journal: Journal of Applied Physics
J. Appl. Phys. 118, 193301 (2015)
https://doi.org/10.1063/1.4935817
Published: November 2015
View articletitled, Numerical evaluation of a 13.5-nm high-brightness microplasma extreme ultraviolet source
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Journal Articles

Correlation between laser absorption and radiation conversion efficiency in laser produced tin plasma

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Hiraku Matsukuma, Atsushi Sunahara, Tatsuya Yanagida, Hiroaki Tomuro, Kouichiro Kouge, Takeshi Kodama, Tatsuya Hosoda, Shinsuke Fujioka, Hiroaki Nishimura
Journal: Applied Physics Letters
Appl. Phys. Lett. 107, 121103 (2015)
https://doi.org/10.1063/1.4931698
Published: September 2015
View articletitled, Correlation between laser absorption and radiation conversion efficiency in laser produced tin plasma
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Journal Articles

Characterization of material ablation driven by laser generated intense extreme ultraviolet light

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Nozomi Tanaka, Masaya Masuda, Ryo Deguchi, Masakatsu Murakami, Atsushi Sunahara, Shinsuke Fujioka, Akifumi Yogo, Hiroaki Nishimura
Journal: Applied Physics Letters
Appl. Phys. Lett. 107, 114101 (2015)
https://doi.org/10.1063/1.4930958
Published: September 2015
View articletitled, Characterization of material ablation driven by laser generated intense extreme ultraviolet light
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Journal Articles

Density and x-ray emission profile relationships in highly ionized high-Z laser-produced plasmas

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Kensuke Yoshida, Shinsuke Fujioka, Takeshi Higashiguchi, Teruyuki Ugomori, Nozomi Tanaka, Masato Kawasaki, Yuhei Suzuki, Chihiro Suzuki, Kentaro Tomita, Ryoichi Hirose, Takeo Ejima, Hayato Ohashi, Masaharu Nishikino, Atsushi Sunahara, Bowen Li, Padraig Dunne, Gerry O'Sullivan, Tatsuya Yanagida, Hiroshi Azechi, Hiroaki Nishimura
Journal: Applied Physics Letters
Appl. Phys. Lett. 106, 121109 (2015)
https://doi.org/10.1063/1.4916395
Published: March 2015
View articletitled, Density and x-ray emission profile relationships in highly ionized high-Z laser-produced plasmas
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Journal Articles

Note: Development of a volume-limited dot target for a high brightness extreme ultraviolet microplasma source

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Thanh Hung Dinh, Yuhei Suzuki, Ryoichi Hirose, Hiroyuki Hara, Hayato Ohashi, Bowen Li, Padraig Dunne, Gerry O’Sullivan, Atsushi Sunahara, Takeshi Higashiguchi
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 85, 116104 (2014)
https://doi.org/10.1063/1.4901934
Published: November 2014
View articletitled, Note: Development of a volume-limited dot target for a high brightness extreme ultraviolet microplasma source
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Journal Articles

Evolution of laser-produced Sn extreme ultraviolet source diameter for high-brightness source

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Amitava Roy, Goki Arai, Hiroyuki Hara, Takeshi Higashiguchi, Hayato Ohashi, Atsushi Sunahara, Bowen Li, Padraig Dunne, Gerry O'Sullivan, Taisuke Miura, Tomas Mocek, Akira Endo
Journal: Applied Physics Letters
Appl. Phys. Lett. 105, 074103 (2014)
https://doi.org/10.1063/1.4893611
Published: August 2014
View articletitled, Evolution of laser-produced Sn extreme ultraviolet source diameter for high-brightness source
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Journal Articles

X-ray backlight measurement of preformed plasma by kJ-class petawatt LFEX laser

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Shinji Ohira, Shinsuke Fujioka, Atsushi Sunahara, Tomoyuki Johzaki, Hideo Nagatomo, Satoshi Matsuo, Noboru Morio, Jyunji Kawanaka, Yoshiki Nakata, Noriaki Miyanaga, Hiroyuki Shiraga, Hiroaki Nishimura, Hiroshi Azechi
Journal: Journal of Applied Physics
J. Appl. Phys. 112, 063301 (2012)
https://doi.org/10.1063/1.4752872
Published: September 2012
View articletitled, X-ray backlight measurement of preformed plasma by kJ-class petawatt LFEX laser
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Journal Articles

Direct measurement of the impulse in a magnetic thrust chamber system for laser fusion rocket

Open Access
Akihiro Maeno, Naoji Yamamoto, Hideki Nakashima, Shinsuke Fujioka, Tomoyuki Johzaki, Yoshitaka Mori, Atsushi Sunahara
Journal: Applied Physics Letters
Appl. Phys. Lett. 99, 071501 (2011)
https://doi.org/10.1063/1.3626600
Published: August 2011
View articletitled, Direct measurement of the impulse in a magnetic thrust chamber system for laser fusion rocket
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Journal Articles

Theoretical investigation of the spectrum and conversion efficiency of short wavelength extreme-ultraviolet light sources based on terbium plasmas

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Akira Sasaki, Katsunobu Nishihara, Atsushi Sunahara, Hiroyuki Furukawa, Takeshi Nishikawa, Fumihiro Koike
Journal: Applied Physics Letters
Appl. Phys. Lett. 97, 231501 (2010)
https://doi.org/10.1063/1.3524494
Published: December 2010
View articletitled, Theoretical investigation of the spectrum and conversion efficiency of short wavelength extreme-ultraviolet light sources based on terbium plasmas
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