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266 results on '"Azechi, Hiroshi"'

1. Effect of irradiation uniformity on quasi-isentropic shock compression of solid spheres

Author

Takizawa, Ryunosuke, Sakagami, Hitoshi, Nagatomo, Hideo, Arikawa, Yasunobu, Morita, Hiroki, Dun, Jinyuan, Tsuido, Takumi, Karaki, Yuga, Matsubara, Hiroki, Law, King Fai Farley, Katagiri, Kento, Ozaki, Norimasa, Hironaka, Yoichiro, Shigemori, Keisuke, Abe, Yuki, Habara, Hideaki, Kuramitsu, Yasuhiro, Johzaki, Tomoyuki, Nakai, Mitsuo, Shiraga, Hiroyuki, Azechi, Hiroshi, Kodama, Ryosuke, Sentoku, Yasuhiko, and Fujioka, Shinsuke

Published
2024
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2. Peta-Pascal Pressure Driven by Fast Isochoric Heating with Multi-Picosecond Intense Laser Pulse

Author

Matsuo, Kazuki, Higashi, Naoki, Iwata, Natsumi, Sakata, Shohei, Lee, Seungho, Johzaki, Tomoyuki, Sawada, Hiroshi, Iwasa, Yuki, Law, King Fai Farley, Morita, Hiroki, Ochiai, Yugo, Kojima, Sadaoki, Abe, Yuki, Hata, Masayasu, Sano, Takayoshi, Nagatomo, Hideo, Sunahara, Atsushi, Morace, Alessio, Yogo, Akifumi, Nakai, Mitsuo, Sakagami, Hitoshi, Ozaki, Tetsuo, Yamanoi, Kohei, Norimatsu, Takayoshi, Nakata, Yoshiki, Tokita, Shigeki, Kawanaka, Junji, Shiraga, Hiroyuki, Mima, Kunioki, Azechi, Hiroshi, Kodama, Ryosuke, Arikawa, Yasunobu, Sentoku, Yasuhiko, and Fujioka, Shinsuke

Subjects
Physics - Plasma Physics
Abstract

Fast isochoric laser heating is a scheme to heat a matter with relativistic-intensity ($>$ 10$^{18}$ W/cm$^2$) laser pulse or X-ray free electron laser pulse. The fast isochoric laser heating has been studied for creating efficiently ultra-high-energy-density (UHED) state. We demonstrate an fast isochoric heating of an imploded dense plasma using a multi-picosecond kJ-class petawatt laser with an assistance of externally applied kilo-tesla magnetic fields for guiding fast electrons to the dense plasma.The UHED state with 2.2 Peta-Pascal is achieved experimentally with 4.6 kJ of total laser energy that is one order of magnitude lower than the energy used in the conventional implosion scheme. A two-dimensional particle-in-cell simulation reveals that diffusive heating from a laser-plasma interaction zone to the dense plasma plays an essential role to the efficient creation of the UHED state., Comment: 8 pages, 4 figures, 1 table

Published
2019
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3. Two-Dimensional Computation of Pulsed Magnetic Field Diffusion Dynamics in Gold Cone with Consideration of Inductive Heating and Temperature Dependence of Electrical Conductivity

Author

Morita, Hiroki, Sunahara, Atsushi, Arikawa, Yasunobu, Azechi, Hiroshi, and Fujioka, Shinsuke

Subjects
Physics - Plasma Physics
Abstract

Application of an external kilo-tesla-level magnetic field, which can be generated using high-intensity laser, to a target is a promising scheme to reduce spray angle of a laser-driven relativistic electron beam (REB) for enhancing the isochoric heating of a dense plasma with the laser-driven REB. Here we have developed a two-dimensional electro-magnetic dynamics (2D-EMD) simulation code to solve Maxwell equations with considerations of the inductive heating and temperature-dependence of electrical conductivity of a material for calculating temporally and spatially resolved two-dimensional profile of the externally applied magnetic field in a gold-cone-attached target.

Published
2018

4. Super-ponderomotive electron acceleration in blowout plasma heated by multi-picosecond relativistic intensity laser pulse

Author

Kojima, Sadaoki, Hata, Masayasu, Iwata, Natsumi, Arikawa, Yasunobu, Morace, Alessio, Sakata, Shouhei, Lee, Seungho, Matsuo, Kazuki, Law, King Fai Farley, Morita, Hiroki, Ochiai, Yugo, Yogo, Akifumi, Nagatomo, Hideo, Ozaki, Tetsuo, Johzaki, Tomoyuki, Sunahara, Atsushi, Sakagami, Hitoshi, Zhang, Zhe, Tosaki, Shota, Abe, Yuki, Kawanaka, Junji, Tokita, Shigeki, Nakai, Mitsuo, Nishimura, Hiroaki, Shiraga, Hiroyuki, Azechi, Hiroshi, Sentoku, Yasuhiko, and Fujioka, Shinsuke

Subjects
Physics - Plasma Physics
Abstract

The dependence of the mean kinetic energy of laser-accelerated electrons on the laser intensity, so-called ponderomotive scaling, was derived theoretically with consideration of the motion of a single electron in oscillating laser fields. This scaling explains well the experimental results obtained with high-intensity pulses and durations shorter than a picosecond; however, this scaling is no longer applicable to the multi-picosecond (multi-ps) facility experiments. Here, we experimentally clarified the generation of the super-ponderomotive-relativistic electrons (SP-REs) through multi-ps relativistic laser-plasma interactions using prepulse-free LFEX laser pulses that were realized using a plasma mirror (PM). The SP-REs are produced with direct laser acceleration assisted by the self-generated quasi-static electric field and with loop-injected direct acceleration by the self- generated quasi-static magnetic field, which grow in a blowout plasma heated by a multi-ps laser pulse. Finally, we theoretically derive the threshold pulse duration to boost the acceleration of REs, which provides an important insight into the determination of laser pulse duration at kilojoule- petawatt laser facilities.

Published
2018

5. Magnetized Fast Isochoric Laser Heating for Efficient Creation of Ultra-High-Energy-Density States

Author

Sakata, Shohei, Lee, Seungho, Johzaki, Tomoyuki, Sawada, Hiroshi, Iwasa, Yuki, Morita, Hiroki, Matsuo, Kazuki, Law, King Fai Farley, Yao, Akira, Hata, Masayasu, Sunahara, Atsushi, Kojima, Sadaoki, Abe, Yuki, Kishimoto, Hidetaka, Syuhada, Aneez, Shiroto, Takashi, Morace, Alessio, Yogo, Akifumi, Iwata, Natsumi, Nakai, Mitsuo, Sakagami, Hitoshi, Ozaki, Tetsuo, Yamanoi, Kohei, Norimatsu, Takayoshi, Nakata, Yoshiki, Tokita, Shigeki, Miyanaga, Noriaki, Kawanaka, Junji, Shiraga, Hiroyuki, Mima, Kunioki, Nishimura, Hiroaki, Bailly-Grandvaux, Mathieu, Santos, Joao Jorge, Nagatomo, Hideo, Azechi, Hiroshi, Kodama, Ryosuke, Arikawa, Yasunobu, Sentoku, Yasuhiko, and Fujioka, Shinsuke

Subjects
Physics - Plasma Physics
Abstract

The quest for the inertial confinement fusion (ICF) ignition is a grand challenge, as exemplified by extraordinary large laser facilities. Fast isochoric heating of a pre-compressed plasma core with a high-intensity short-pulse laser is an attractive and alternative approach to create ultra-high-energy-density states like those found in ICF ignition sparks. This avoids the ignition quench caused by the hot spark mixing with the surrounding cold fuel, which is the crucial problem of the currently pursued ignition scheme. High-intensity lasers efficiently produce relativistic electron beams (REB). A part of the REB kinetic energy is deposited in the core, and then the heated region becomes the hot spark to trigger the ignition. However, only a small portion of the REB collides with the core because of its large divergence. Here we have demonstrated enhanced laser-to-core energy coupling with the magnetized fast isochoric heating. The method employs a kilo-tesla-level magnetic field that is applied to the transport region from the REB generation point to the core which results in guiding the REB along the magnetic field lines to the core. 7.7 $\pm$ 1.3 % of the maximum coupling was achieved even with a relatively small radial area density core ($\rho R$ $\sim$ 0.1 g/cm$^2$). The guided REB transport was clearly visualized in a pre-compressed core by using Cu-$K_\alpha$ imaging technique. A simplified model coupled with the comprehensive diagnostics yields 6.2\% of the coupling that agrees fairly with the measured coupling. This model also reveals that an ignition-scale areal density core ($\rho R$ $\sim$ 0.4 g/cm$^2$) leads to much higher laser-to-core coupling ($>$ 15%), this is much higher than that achieved by the current scheme.

Published
2017
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6. Flash X-ray backlight technique using a Fresnel phase zone plate for measuring interfacial instability

Author

Matsuo, Kazuki, Sano, Takayoshi, Ishigure, Kazuki, Kato, Hiroki, Nagamatsu, Natsuko, Baojun, Zhu, Shuwang, Guo, Nagatomo, Hideo, Philippe, Nicolai, Sakawa, Youichi, Arikawa, Yasunobu, Sakata, Shohei, Lee, SeungHo, Farley Law, King Fai, Morita, Hiroki, Liu, Chang, Li, Huan, Nishibata, Jo, Takizawa, Ryunosuke, Azechi, Hiroshi, and Fujioka, Shinsuke

Published
2020
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9. ZnO crystal as a potential damage-recoverable window material for fusion reactors

Author

Yamanoi, Kohei, Empizo, Melvin John F., Mori, Kazuyuki, Iwano, Keisuke, Minami, Yuki, Arita, Ren, Iwasa, Yuki, Fukuda, Kazuhito, Kato, Kosaku, Takano, Keisuke, Shimizu, Toshihiko, Nakajima, Makoto, Yoshimura, Masashi, Sarukura, Nobuhiko, Norimatsu, Takayoshi, Hangyo, Masanori, Azechi, Hiroshi, Fukuda, Tsuguo, Singidas, Bess G., Sarmago, Roland V., Oya, Makoto, and Ueda, Yoshio

Published
2016
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11. Electromagnetic field growth triggering super-ponderomotive electron acceleration during multi-picosecond laser-plasma interaction

Author

Kojima, Sadaoki, Hata, Masayasu, Iwata, Natsumi, Arikawa, Yasunobu, Morace, Alessio, Sakata, Shohei, Lee, Seungho, Matsuo, Kazuki, Law, King Fai Farley, Morita, Hiroki, Ochiai, Yugo, Yogo, Akifumi, Nagatomo, Hideo, Ozaki, Tetsuo, Johzaki, Tomoyuki, Sunahara, Atsushi, Sakagami, Hitoshi, Zhang, Zhe, Tosaki, Shota, Abe, Yuki, Kawanaka, Junji, Tokita, Shigeki, Nakai, Mitsuo, Nishimura, Hiroaki, Shiraga, Hiroyuki, Azechi, Hiroshi, Sentoku, Yasuhiko, and Fujioka, Shinsuke

Published
2019
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13. Pr or Ce-doped, fast-response and low-afterglow cross-section-enhanced scintillator with 6Li for down-scattered neutron originated from laser fusion

Author

Watanabe, Kozue, Arikawa, Yasunobu, Yamanoi, Kohei, Cadatal-Raduban, Marilou, Nagai, Takahiro, Kouno, Masahiro, Sakai, Kohei, Nazakato, Tomoharu, Shimizu, Toshihiko, Sarukura, Nobuhiko, Nakai, Mitsuo, Norimatsu, Takayoshi, Azechi, Hiroshi, Yoshikawa, Akira, Murata, Takahiro, Fujino, Shigeru, Yoshida, Hideki, Izumi, Nobuhiko, Satoh, Nakahiro, and Kan, Hirofumi

Published
2013
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15. Super-strong magnetic field-dominated ion beam dynamics in focusing plasma devices

Author

MORACE, A., ABE, Y., HONRUBIA, J.J., IWATA, N., ARIKAWA, Yasunobu, NAKATA, Y., JOHZAKI, Tomoyuki, YOGO, A., SENTOKU, Yasuhiko, MIMA, Kunioki, MA, T., MARISCAL, D., SAKAGAMI, Hitoshi, NORIMATSU, Takayoshi, TSUBAKIMOTO, Koji, KAWANAKA, Junji, TOKITA, Shigeki, MIYANAGA, Noriaki, SHIRAGA, Hiroyuki, SAKAWA, Yohichi, NAKAI, Mitsuo, AZECHI, Hiroshi, FUJIOKA, Shinsuke, KODAMA, Ryosuke, MORACE, A., ABE, Y., HONRUBIA, J.J., IWATA, N., ARIKAWA, Yasunobu, NAKATA, Y., JOHZAKI, Tomoyuki, YOGO, A., SENTOKU, Yasuhiko, MIMA, Kunioki, MA, T., MARISCAL, D., SAKAGAMI, Hitoshi, NORIMATSU, Takayoshi, TSUBAKIMOTO, Koji, KAWANAKA, Junji, TOKITA, Shigeki, MIYANAGA, Noriaki, SHIRAGA, Hiroyuki, SAKAWA, Yohichi, NAKAI, Mitsuo, AZECHI, Hiroshi, FUJIOKA, Shinsuke, and KODAMA, Ryosuke

Abstract

High energy density physics is the field of physics dedicated to the study of matter and plasmas in extreme conditions of temperature, densities and pressures. It encompasses multiple disciplines such as material science, planetary science, laboratory and astrophysical plasma science. For the latter, high energy density states can be accompanied by extreme radiation environments and super-strong magnetic fields. The creation of high energy density states in the laboratory consists in concentrating/depositing large amounts of energy in a reduced mass, typically solid material sample or dense plasma, over a time shorter than the typical timescales of heat conduction and hydrodynamic expansion. Laser-generated, high current–density ion beams constitute an important tool for the creation of high energy density states in the laboratory. Focusing plasma devices, such as cone-targets are necessary in order to focus and direct these intense beams towards the heating sample or dense plasma, while protecting the proton generation foil from the harsh environments typical of an integrated high-power laser experiment. A full understanding of the ion beam dynamics in focusing devices is therefore necessary in order to properly design and interpret the numerous experiments in the field. In this work, we report a detailed investigation of large-scale, kilojoule-class laser-generated ion beam dynamics in focusing devices and we demonstrate that high-brilliance ion beams compress magnetic fields to amplitudes exceeding tens of kilo-Tesla, which in turn play a dominant role in the focusing process, resulting either in a worsening or enhancement of focusing capabilities depending on the target geometry., source:Morace, A., Abe, Y., Honrubia, J.J. et al. Super-strong magnetic field-dominated ion beam dynamics in focusing plasma devices. Sci Rep 12, 6876 (2022). https://doi.org/10.1038/s41598-022-10829-1, source:https://doi.org/10.1038/s41598-022-10829-1

Published
2022

16. Optical and scintillation properties of Pr-doped Li-glass for neutron detection in inertial confinement fusion process

Author

Fukabori, Akihiro, Yanagida, Takayuki, Chani, Valery, Moretti, Federico, Pejchal, Jan, Yokota, Yuui, Kawaguchi, Noriaki, Kamada, Kei, Watanabe, Ken-ichi, Murata, Takahiro, Arikawa, Yasunobu, Yamanoi, Kohei, Shimizu, Toshihiko, Sarukura, Nobuhiko, Nakai, Mitsuo, Norimatsu, Takayoshi, Azechi, Hiroshi, Fujino, Shigeru, Yoshida, Hideki, and Yoshikawa, Akira

Published
2011
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17. Custom-designed scintillator for laser fusion diagnostics – Pr 3+-doped fluoro-phosphate lithium glass scintillator

Author

Arikawa, Yasunobu, Yamanoi, Kohei, Nakazato, Tomoharu, Estacio, Elmer Surat, Shimizu, Toshihiko, Sarukura, Nobuhiko, Nakai, Mitsuo, Norimatsu, Takayoshi, Hironaka, Youichirou, Azechi, Hiroshi, Murata, Takahiro, Fujino, Shigeru, Yoshida, Hideki, Kamada, Kei, Usuki, Yoshiyuki, Suyama, Toshihisa, Yoshikawa, Akira, Satoh, Nakahiro, and Kan, Hirohumi

Published
2010
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18. Imaging of Radiation Accidents and Radioactive Contamination Using Scintillators

Author

Ogawa, Tomoya, primary, Sarukura, Nobuhiko, additional, Watanabe, Masahito, additional, Fukuda, Tsuguo, additional, Nango, Nobuhito, additional, Arikawa, Yasunobu, additional, Yamanoi, Kohei, additional, Nakazato, Tomoharu, additional, Cadatal-Raduban, Marilou, additional, Shimizu, Toshihiko, additional, Nakai, Mitsuo, additional, Norimatsu, Takayoshi, additional, Azechi, Hiroshi, additional, Murata, Takahiro, additional, Fujino, Shigeru, additional, Yoshida, Hideki, additional, Kamada, Kei, additional, Usuki, Yoshiyuki, additional, Suyama, Toshihisa, additional, Yoshikawa, Akira, additional, Sato, Nakahiro, additional, Kan, Hirofumi, additional, Nishimura, Hiroaki, additional, Mima, Kunioki, additional, Hosaka, Masahito, additional, Katoh, Masahiro, additional, Kosugi, Nobuhiro, additional, Fukuda, Kentaro, additional, Yanagida, Takayuki, additional, Yokota, Yuui, additional, Saito, Fumio, additional, Sakai, Kouhei, additional, Ehrentraut, Dirk, additional, Nagasono, Mitsuru, additional, Togashi, Tadashi, additional, Higashiya, Atsushi, additional, Yabashi, Makina, additional, Ishikawa, Tetsuya, additional, Ohashi, Haruhiko, additional, and Kimur, Hiroaki, additional

Published
2011
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19. The conceptual design of 1-ps time resolution neutron detector for fusion reaction history measurement at OMEGA and the National Ignition Facility

Author

Arikawa, Yasunobu, primary, Ota, Masato, additional, Nakajima, Makoto, additional, Shimizu, Tomoki, additional, Segawa, Sadashi, additional, Khoa Phan, Thanh Nhat, additional, Sakawa, Youichi, additional, Abe, Yuki, additional, Morace, Alessio, additional, Mirfayzi, Seyed Reza, additional, Yogo, Akifumi, additional, Fujioka, Shinsuke, additional, Nakai, Mitsuo, additional, Shiraga, Hiroyuki, additional, Azechi, Hiroshi, additional, Kodama, Ryosuke, additional, Kan, Koichi, additional, Frenje, Johan, additional, Gatu Johnson, Maria, additional, Bose, Arijit, additional, Kabadi, Neel V., additional, Sutcliffe, Graeme D., additional, Adrian, Patrick, additional, Li, Chikang, additional, Séguin, Fredrick H., additional, and Petrasso, Richard, additional

Published
2020
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20. Petapascal Pressure Driven by Fast Isochoric Heating with a Multipicosecond Intense Laser Pulse

Author

Matsuo, Kazuki, primary, Higashi, Naoki, additional, Iwata, Natsumi, additional, Sakata, Shohei, additional, Lee, Seungho, additional, Johzaki, Tomoyuki, additional, Sawada, Hiroshi, additional, Iwasa, Yuki, additional, Law, King Fai Farley, additional, Morita, Hiroki, additional, Ochiai, Yugo, additional, Kojima, Sadaoki, additional, Abe, Yuki, additional, Hata, Masayasu, additional, Sano, Takayoshi, additional, Nagatomo, Hideo, additional, Sunahara, Atsushi, additional, Morace, Alessio, additional, Yogo, Akifumi, additional, Nakai, Mitsuo, additional, Sakagami, Hitoshi, additional, Ozaki, Tetsuo, additional, Yamanoi, Kohei, additional, Norimatsu, Takayoshi, additional, Nakata, Yoshiki, additional, Tokita, Shigeki, additional, Kawanaka, Junji, additional, Shiraga, Hiroyuki, additional, Mima, Kunioki, additional, Azechi, Hiroshi, additional, Kodama, Ryosuke, additional, Arikawa, Yasunobu, additional, Sentoku, Yasuhiko, additional, and Fujioka, Shinsuke, additional

Published
2020
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21. Magnetized fast isochoric laser heating for efficient creation of ultra-high-energy-density states

Author

Sakata, Shohei, primary, Lee, Seungho, additional, Morita, Hiroki, additional, Johzaki, Tomoyuki, additional, Sawada, Hiroshi, additional, Iwasa, Yuki, additional, Matsuo, Kazuki, additional, Law, King Fai Farley, additional, Yao, Akira, additional, Hata, Masayasu, additional, Sunahara, Atsushi, additional, Kojima, Sadaoki, additional, Abe, Yuki, additional, Kishimoto, Hidetaka, additional, Syuhada, Aneez, additional, Shiroto, Takashi, additional, Morace, Alessio, additional, Yogo, Akifumi, additional, Iwata, Natsumi, additional, Nakai, Mitsuo, additional, Sakagami, Hitoshi, additional, Ozaki, Tetsuo, additional, Yamanoi, Kohei, additional, Norimatsu, Takayoshi, additional, Nakata, Yoshiki, additional, Tokita, Shigeki, additional, Miyanaga, Noriaki, additional, Kawanaka, Junji, additional, Shiraga, Hiroyuki, additional, Mima, Kunioki, additional, Nishimura, Hiroaki, additional, Bailly-Grandvaux, Mathieu, additional, Santos, João Jorge, additional, Nagatomo, Hideo, additional, Azechi, Hiroshi, additional, Kodama, Ryosuke, additional, Arikawa, Yasunobu, additional, Sentoku, Yasuhiko, additional, and Fujioka, Shinsuke, additional

Published
2018
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23. 3 × 108 D-D Neutron Generation by High-Intensity Laser Irradiation onto the Inner Surface of Spherical CD Shells

Author

SATOH, Nakahiro, primary, WATARI, Takeshi, additional, NISHIHARA, Katsunobu, additional, MATSUKADO, Koji, additional, YOSHIMURA, Ryo, additional, AKIYAMA, Naoki, additional, TAKAGI, Masaru, additional, KAWASHIMA, Toshiyuki, additional, ABE, Yuki, additional, ARIKAWA, Yasunobu, additional, SUNAHARA, Atsushi, additional, HIRONAKA, Yoichiro, additional, SHIGEMORI, Keisuke, additional, FUJIOKA, Shinsuke, additional, NAKAI, Mitsuo, additional, and AZECHI, Hiroshi, additional

Published
2018
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24. X-ray backlight measurement of preformed plasma by kJ-class petawatt LFEX laser.

Author

Ohira, Shinji, Fujioka, Shinsuke, Sunahara, Atsushi, Johzaki, Tomoyuki, Nagatomo, Hideo, Matsuo, Satoshi, Morio, Noboru, Kawanaka, Jyunji, Nakata, Yoshiki, Miyanaga, Noriaki, Shiraga, Hiroyuki, Nishimura, Hiroaki, and Azechi, Hiroshi

Subjects
LASER-plasma interactions, PLASMA gases, ELECTRON beams, X-ray diffraction, HYDRODYNAMICS
Abstract

Foot and pedestal pulses that precede the main pulse from a high-intensity laser greatly affect laser-plasma interactions. Especially in fast ignition schemes, preceding pulses generate a plasma prior to irradiation by the main pulse. This results in a too energetic and divergent electron beam being generated in the preformed plasma, which reduces the energy coupling efficiency from the heating laser to the dense fuel core. A preformed plasma with a density scale length of 40-60 μm was observed by a time- and space-resolved x-ray backlight technique using the LFEX laser system at the Institute of Laser Engineering, Osaka University. Preceding pulses (i.e., the foot and pedestal) of the LFEX were characterized by comparing observations with calculations results obtained using a two-dimension (2D) radiation-hydrodynamic simulation code. In a separate experiment, the 2D code was benchmarked with the experimentally observed hydrodynamic behavior of a gold plasma produced by a nanosecond laser pulse that mimicked foot and pedestal pulses (intensity: 1 ×1011-1×1012W/cm2). The preceding pulses were estimated to have an intensity of 1 ×1012-1013W/cm2, a duration of 2.0 ns, and a spot diameter at the target of 200-600 μm by comparing the measured hydrodynamics of the preformed plasma with that calculated by the 2D hydrodynamic simulation code. [ABSTRACT FROM AUTHOR]

Published
2012
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25. Erratum: “Efficient and Repetitive Neutron Generation by Double-Laser-Pulse Driven Photonuclear Reaction” [Plasma Fusion Res. 13, 2404009 (2018)]

Author

ARIKAWA, Yasunobu, primary, KATO, Yusuke, additional, ABE, Yuki, additional, MATSUBARA, Shuto, additional, KISHIMOTO, Hidetaka, additional, NAKAJIMA, Nozomi, additional, MORACE, Alessio, additional, YOGO, Akifumi, additional, NISHIMURA, Hiroaki, additional, NAKAI, Mitsuo, additional, FUJIOKA, Shinsuke, additional, AZECHI, Hiroshi, additional, MIMA, Kunioki, additional, INOUE, Shunsuke, additional, NAKAMIYA, Yoshihide, additional, TERAMOTO, Kensuke, additional, HASHIDA, Masaki, additional, and SAKABE, Shuji, additional

Published
2018
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26. Efficient and Repetitive Neutron Generation by Double-Laser-Pulse Driven Photonuclear Reaction

Author

ARIKAWA, Yasunobu, primary, KATO, Yusuke, additional, ABE, Yuki, additional, MATSUBARA, Shuto, additional, KISHIMOTO, Hidetaka, additional, NAKAJIMA, Nozomi, additional, MORACE, Alessio, additional, YOGO, Akifumi, additional, NISHIMURA, Hiroaki, additional, NAKAI, Mitsuo, additional, FUJIOKA, Shinsuke, additional, AZECHI, Hiroshi, additional, MIMA, Kunioki, additional, INOUE, Shunsuke, additional, NAKAMIYA, Yoshihide, additional, TERAMOTO, Kensuke, additional, HASHIDA, Masaki, additional, and SAKABE, Shuji, additional

Published
2018
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28. Magnetohydrodynamics of laser-produced high-energy-density plasma in a strong external magnetic field

Author

Matsuo, Kazuki, primary, Nagatomo, Hideo, additional, Zhang, Zhe, additional, Nicolai, Philippe, additional, Sano, Takayoshi, additional, Sakata, Shohei, additional, Kojima, Sadaoki, additional, Lee, Seung Ho, additional, Law, King Fai Farley, additional, Arikawa, Yasunobu, additional, Sakawa, Youichi, additional, Morita, Taichi, additional, Kuramitsu, Yasuhiro, additional, Fujioka, Shinsuke, additional, and Azechi, Hiroshi, additional

Published
2017
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29. Optical damage assessment and recovery investigation of hydrogen-ion and deuterium-ion plasma-irradiated bulk ZnO single crystals

Author

Empizo, Melvin John F., primary, Yamanoi, Kohei, additional, Mori, Kazuyuki, additional, Iwano, Keisuke, additional, Iwasa, Yuki, additional, Minami, Yuki, additional, Arita, Ren, additional, Fukuda, Kazuhito, additional, Takano, Keisuke, additional, Shimizu, Toshihiko, additional, Nakajima, Makoto, additional, Yoshimura, Masashi, additional, Sarukura, Nobuhiko, additional, Norimatsu, Takayoshi, additional, Hangyo, Masanori, additional, Azechi, Hiroshi, additional, Fukuda, Tsuguo, additional, Singidas, Bess G., additional, Sarmago, Roland V., additional, Oya, Makoto, additional, and Ueda, Yoshio, additional

Published
2017
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30. High pressure band gap modification of LiCaAlF6

Author

Shimizu, Toshihiko, primary, Luong, Mui Viet, additional, Cadatal-Raduban, Marilou, additional, Empizo, Melvin John F., additional, Yamanoi, Kohei, additional, Arita, Ren, additional, Minami, Yuki, additional, Sarukura, Nobuhiko, additional, Mitsuo, Nakai, additional, Azechi, Hiroshi, additional, Pham, Minh Hong, additional, Nguyen, Hung Dai, additional, Ichiyanagi, Kouhei, additional, Nozawa, Shunsuke, additional, Fukaya, Ryo, additional, Adachi, Shin-ichi, additional, Nakamura, Kazutaka G., additional, Fukuda, Kentaro, additional, Kawazoe, Yoshiyuki, additional, Steenbergen, Krista G., additional, and Schwerdtfeger, Peter, additional

Published
2017
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31. First-principles calculations of electronic and optical properties of LiCaAlF 6 and LiSrAlF 6 crystals as VUV to UV solid-state laser materials

Author

Luong, Mui Viet, primary, Empizo, Melvin John F., additional, Cadatal-Raduban, Marilou, additional, Arita, Ren, additional, Minami, Yuki, additional, Shimizu, Toshihiko, additional, Sarukura, Nobuhiko, additional, Azechi, Hiroshi, additional, Pham, Minh Hong, additional, Nguyen, Hung Dai, additional, Kawazoe, Yoshiyuki, additional, Steenbergen, Krista G., additional, and Schwerdtferger, Peter, additional

Published
2017
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32. Optical transmittance investigation of 1-keV ion-irradiated sapphire crystals as potential VUV to NIR window materials of fusion reactors

Author

Iwano, Keisuke, 1000030722813, 0000-0003-4492-4099, Yamanoi, Kohei, 1000090838947, Iwasa, Yuki, Mori, Kazuyuki, Minami, Yuki, Arita, Ren, Yamanaka, Takuma, Fukuda, Kazuhito, Empizo, Melvin John F., 1000070583102, Takano, Keisuke, 1000080415182, Shimizu, Toshihiko, 1000040361662, 0000-0002-0351-2197, Nakajima, Makoto, 1000060314382, Yoshimura, Masashi, 1000040260202, Sarukura, Nobuhiko, 1000050135753, Norimatsu, Takayoshi, 1000010144429, Hangyo, Masanori, Azechi, Hiroshi, Singidas, Bess G., Sarmago, Roland V., 1000010804750, Oya, Makoto, 1000030193816, Ueda, Yoshio, Iwano, Keisuke, 1000030722813, 0000-0003-4492-4099, Yamanoi, Kohei, 1000090838947, Iwasa, Yuki, Mori, Kazuyuki, Minami, Yuki, Arita, Ren, Yamanaka, Takuma, Fukuda, Kazuhito, Empizo, Melvin John F., 1000070583102, Takano, Keisuke, 1000080415182, Shimizu, Toshihiko, 1000040361662, 0000-0002-0351-2197, Nakajima, Makoto, 1000060314382, Yoshimura, Masashi, 1000040260202, Sarukura, Nobuhiko, 1000050135753, Norimatsu, Takayoshi, 1000010144429, Hangyo, Masanori, Azechi, Hiroshi, Singidas, Bess G., Sarmago, Roland V., 1000010804750, Oya, Makoto, 1000030193816, and Ueda, Yoshio

Abstract

Iwano K., Yamanoi K., Iwasa Y., et al. Optical transmittance investigation of 1-keV ion-irradiated sapphire crystals as potential VUV to NIR window materials of fusion reactors. AIP Advances 6, 105108 (2016); https://doi.org/10.1063/1.4965927., We investigate the optical transmittances of ion-irradiated sapphire crystals as potential vacuum ultraviolet (VUV) to near-infrared (NIR) window materials of fusion reactors. Under potential conditions in fusion reactors, sapphire crystals are irradiated with hydrogen (H), deuterium (D), and helium (He) ions with 1-keV energy and ∼ 1020-m-2 s-1 flux. Ion irradiation decreases the transmittances from 140 to 260 nm but hardly affects the transmittances from 300 to 1500 nm. H-ion and D-ion irradiation causes optical absorptions near 210 and 260 nm associated with an F-center and an F+-center, respectively. These F-type centers are classified as Schottky defects that can be removed through annealing above 1000 K. In contrast, He-ion irradiation does not cause optical absorptions above 200 nm because He-ions cannot be incorporated in the crystal lattice due to the large ionic radius of He-ions. Moreover, the significant decrease in transmittance of the ion-irradiated sapphire crystals from 140 to 180 nm is related to the light scattering on the crystal surface. Similar to diamond polishing, ion irradiation modifies the crystal surface thereby affecting the optical properties especially at shorter wavelengths. Although the transmittances in the VUV wavelengths decrease after ion irradiation, the transmittances can be improved through annealing above 1000 K. With an optical transmittance in the VUV region that can recover through simple annealing and with a high transparency from the ultraviolet (UV) to the NIR region, sapphire crystals can therefore be used as good optical windows inside modern fusion power reactors in terms of light particle loadings of hydrogen isotopes and helium.

Published
2016

33. Optical transmittance investigation of 1-keV ion-irradiated sapphire crystals as potential VUV to NIR window materials of fusion reactors

Author

Iwano, Keisuke, primary, Yamanoi, Kohei, additional, Iwasa, Yuki, additional, Mori, Kazuyuki, additional, Minami, Yuki, additional, Arita, Ren, additional, Yamanaka, Takuma, additional, Fukuda, Kazuhito, additional, Empizo, Melvin John F., additional, Takano, Keisuke, additional, Shimizu, Toshihiko, additional, Nakajima, Makoto, additional, Yoshimura, Masashi, additional, Sarukura, Nobuhiko, additional, Norimatsu, Takayoshi, additional, Hangyo, Masanori, additional, Azechi, Hiroshi, additional, Singidas, Bess G., additional, Sarmago, Roland V., additional, Oya, Makoto, additional, and Ueda, Yoshio, additional

Published
2016
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34. Energy distribution of fast electrons accelerated by high intensity laser pulse depending on laser pulse duration

Author

Kojima, Sadaoki, primary, Arikawa, Yasunobu, additional, Morace, Alessio, additional, Hata, Masayasu, additional, Nagatomo, Hideo, additional, Ozaki, Tetsuo, additional, Sakata, Shohei, additional, Lee, Seung Ho, additional, Matsuo, Kazuki, additional, Law, King Fai Farley, additional, Tosaki, Shota, additional, Yogo, Akifumi, additional, Johzaki, Tomoyuki, additional, Sunahara, Atsushi, additional, Sakagami, Hitoshi, additional, Nakai, Mitsuo, additional, Nishimura, Hiroaki, additional, Shiraga, Hiroyuki, additional, Fujioka, Shinsuke, additional, and Azechi, Hiroshi, additional

Published
2016
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35. Fast ignition realization experiment with high-contrast kilo-joule peta-watt LFEX laser and strong external magnetic field

Author

Fujioka, Shinsuke, primary, Arikawa, Yasunobu, additional, Kojima, Sadaoki, additional, Johzaki, Tomoyuki, additional, Nagatomo, Hideo, additional, Sawada, Hiroshi, additional, Lee, Seung Ho, additional, Shiroto, Takashi, additional, Ohnishi, Naofumi, additional, Morace, Alessio, additional, Vaisseau, Xavier, additional, Sakata, Shohei, additional, Abe, Yuki, additional, Matsuo, Kazuki, additional, Farley Law, King Fai, additional, Tosaki, Shota, additional, Yogo, Akifumi, additional, Shigemori, Keisuke, additional, Hironaka, Yoichiro, additional, Zhang, Zhe, additional, Sunahara, Atsushi, additional, Ozaki, Tetsuo, additional, Sakagami, Hitoshi, additional, Mima, Kunioki, additional, Fujimoto, Yasushi, additional, Yamanoi, Kohei, additional, Norimatsu, Takayoshi, additional, Tokita, Shigeki, additional, Nakata, Yoshiki, additional, Kawanaka, Junji, additional, Jitsuno, Takahisa, additional, Miyanaga, Noriaki, additional, Nakai, Mitsuo, additional, Nishimura, Hiroaki, additional, Shiraga, Hiroyuki, additional, Kondo, Kotaro, additional, Bailly-Grandvaux, Mathieu, additional, Bellei, Claudio, additional, Santos, João Jorge, additional, and Azechi, Hiroshi, additional

Published
2016
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36. Development of Compton X-ray spectrometer for high energy resolution single-shot high-flux hard X-ray spectroscopy

Author

Kojima, Sadaoki, primary, Ikenouchi, Takahito, additional, Arikawa, Yasunobu, additional, Sakata, Shohei, additional, Zhang, Zhe, additional, Abe, Yuki, additional, Nakai, Mitsuo, additional, Nishimura, Hiroaki, additional, Shiraga, Hiroyuki, additional, Ozaki, Tetsuo, additional, Miyamoto, Shuji, additional, Yamaguchi, Masashi, additional, Takemoto, Akinori, additional, Fujioka, Shinsuke, additional, and Azechi, Hiroshi, additional

Published
2016
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37. Beyond Extreme Ultra Violet (BEUV) Radiation from Spherically symmetrical High-Z plasmas

Author

Yoshida, Kensuke, primary, Fujioka, Shinsuke, additional, Higashiguchi, Takeshi, additional, Ugomori, Teruyuki, additional, Tanaka, Nozomi, additional, Kawasaki, Masato, additional, Suzuki, Yuhei, additional, Suzuki, Chihiro, additional, Tomita, Kentaro, additional, Hirose, Ryouichi, additional, Eshima, Takeo, additional, Ohashi, Hayato, additional, Nishikino, Masaharu, additional, Scally, Enda, additional, Nshimura, Hiroaki, additional, Azechi, Hiroshi, additional, and O'Sullivan, Gerard, additional

Published
2016
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39. Comparison of the electronic band structures of LiCaAlF6and LiSrAlF6ultraviolet laser host media from ab initio calculations

Author

Luong, Mui Viet, primary, Cadatal-Raduban, Marilou, additional, Empizo, Melvin John F., additional, Arita, Ren, additional, Minami, Yuki, additional, Shimizu, Toshihiko, additional, Sarukura, Nobuhiko, additional, Azechi, Hiroshi, additional, Pham, Minh Hong, additional, Nguyen, Hung Dai, additional, and Kawazoe, Yoshiyuki, additional

Published
2015
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40. Heating efficiency evaluation with mimicking plasma conditions of integrated fast-ignition experiment

Author

Fujioka, Shinsuke, primary, Johzaki, Tomoyuki, additional, Arikawa, Yasunobu, additional, Zhang, Zhe, additional, Morace, Alessio, additional, Ikenouchi, Takahito, additional, Ozaki, Tetsuo, additional, Nagai, Takahiro, additional, Abe, Yuki, additional, Kojima, Sadaoki, additional, Sakata, Shohei, additional, Inoue, Hiroaki, additional, Utsugi, Masaru, additional, Hattori, Shoji, additional, Hosoda, Tatsuya, additional, Lee, Seung Ho, additional, Shigemori, Keisuke, additional, Hironaka, Youichiro, additional, Sunahara, Atsushi, additional, Sakagami, Hitoshi, additional, Mima, Kunioki, additional, Fujimoto, Yasushi, additional, Yamanoi, Kohei, additional, Norimatsu, Takayoshi, additional, Tokita, Shigeki, additional, Nakata, Yoshiki, additional, Kawanaka, Junji, additional, Jitsuno, Takahisa, additional, Miyanaga, Noriaki, additional, Nakai, Mitsuo, additional, Nishimura, Hiroaki, additional, Shiraga, Hiroyuki, additional, Nagatomo, Hideo, additional, and Azechi, Hiroshi, additional

Published
2015
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41. Gamma-ray irradiation effects on the optical properties of bulk ZnO single crystals

Author

Empizo, Melvin John F., primary, Yamanoi, Kohei, additional, Mori, Kazuyuki, additional, Arita, Ren, additional, Iwano, Keisuke, additional, Takabatake, Masahiro, additional, Fukuda, Kazuhito, additional, Hori, Tatsuhiro, additional, Minami, Yuki, additional, Luong, Mui Viet, additional, Abe, Yuki, additional, Kojima, Sadaoki, additional, Arikawa, Yasunobu, additional, Shimizu, Toshihiko, additional, Sarukura, Nobuhiko, additional, Norimatsu, Takayoshi, additional, Azechi, Hiroshi, additional, Salvador, Arnel A., additional, Sarmago, Roland V., additional, and Fukuda, Tsuguo, additional

Published
2015
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42. Advanced target design for the FIREX-I project

Author

Azechi, Hiroshi, Nakai, Mitsuo, Homma, Hirofumi, Johzaki, Tomoyuki, Koga, Mayuko, Mima, Kunioki, Murakami, Masakatsu, Nagatomo, Hideo, Nagai, Keiji, Nakamura, Tatsufumi, Nishihara, Katsunobu, Nishimura, Hiroaki, Norimatsu, Takayoshi, Kodama, Ryosuke, and Tanaka, Kazuo

Published
2009

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

Author

Yoshida, Kensuke, primary, Fujioka, Shinsuke, additional, Higashiguchi, Takeshi, additional, Ugomori, Teruyuki, additional, Tanaka, Nozomi, additional, Kawasaki, Masato, additional, Suzuki, Yuhei, additional, Suzuki, Chihiro, additional, Tomita, Kentaro, additional, Hirose, Ryoichi, additional, Ejima, Takeo, additional, Ohashi, Hayato, additional, Nishikino, Masaharu, additional, Sunahara, Atsushi, additional, Li, Bowen, additional, Dunne, Padraig, additional, O'Sullivan, Gerry, additional, Yanagida, Tatsuya, additional, Azechi, Hiroshi, additional, and Nishimura, Hiroaki, additional

Published
2015
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45. High-Intensity Neutron Generation via Laser-Driven Photonuclear Reaction

Author

ARIKAWA, Yasunobu, primary, UTSUGI, Masaru, additional, ALESSIO, Morace, additional, NAGAI, Takahiro, additional, ABE, Yuki, additional, KOJIMA, Sadaoki, additional, SAKATA, Shohei, additional, INOUE, Hiroaki, additional, FUJIOKA, Shinsuke, additional, ZHANG, Zhe, additional, CHEN, Hui, additional, PARK, Jaebum, additional, WILLIAMS, Jackson, additional, MORITA, Taichi, additional, SAKAWA, Yoichi, additional, NAKATA, Yoshiki, additional, KAWANAKA, Junji, additional, JITSUNO, Takahisa, additional, SARUKURA, Nobuhiko, additional, MIYANAGA, Noriaki, additional, NAKAI, Mitsuo, additional, SHIRAGA, Hiroyuki, additional, NISHIMURA, Hiroaki, additional, and AZECHI, Hiroshi, additional

Published
2015
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48. Accuracy evaluation of a Compton X-ray spectrometer with bremsstrahlung X-rays generated by a 6 MeV electron bunch

Author

Kojima, Sadaoki, primary, Arikawa, Yasunobu, additional, Nishimura, Yasuhiko, additional, Togawa, Hiromi, additional, Zhang, Zhe, additional, Ikenouchi, Takahito, additional, Ozaki, Tetsuo, additional, Morace, Alessio, additional, Nagai, Takahiro, additional, Abe, Yuki, additional, Sakata, Shouhei, additional, Inoue, Hiroaki, additional, Utsugi, Masaru, additional, Nakai, Mitsuo, additional, Nishimura, Hiroaki, additional, Shiraga, Hiroyuki, additional, Kato, Ryukou, additional, Fujioka, Shinsuke, additional, and Azechi, Hiroshi, additional

Published
2014
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49. Efficient extreme ultraviolet emission from one-dimensional spherical plasmas produced by multiple lasers

Author

Yoshida, Kensuke, primary, Fujioka, Shinsuke, additional, Higashiguchi, Takeshi, additional, Ugomori, Teruyuki, additional, Tanaka, Nozomi, additional, Ohashi, Hayato, additional, Kawasaki, Masato, additional, Suzuki, Yuhei, additional, Suzuki, Chihiro, additional, Tomita, Kentaro, additional, Hirose, Ryoichi, additional, Ejima, Takeo, additional, Nishikino, Masaharu, additional, Sunahara, Atsushi, additional, Scally, Enda, additional, Li, Bowen, additional, Yanagida, Tatsuya, additional, Nishimura, Hiroaki, additional, Azechi, Hiroshi, additional, and O’Sullivan, Gerry, additional

Published
2014
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50. Development of Compton X-Ray Spectrometer for Fast Ignition Experiment

Author

KOJIMA, Sadaoki, ARIKAWA, Yasunobu, IKENOUCHI, Takahito, NAGAI, Takahiro, ABE, Yuki, SAKATA, Shohei, INOUE, Hiroaki, NAMIMOTO, Takuya, FUJIOKA, Shinsuke, NAKAI, Mitsuo, SHIRAGA, Hiroyuki, GEKKO-XII&LFEX Team, OZAKI, Tetsuo, ASAKAWA, Makoto R., KATO, Ryukou, and AZECHI, Hiroshi

Subjects
filter stack spectrometer, fast electron, inertial confinement fusion, fast ignition, x-ray spectrometer
Abstract

In the context of Fast Ignition, the fast electron temperature is a key parameter to determine the laser-to-fast electron energy conversion efficiency. Bremsstrahlung X-ray (γ-ray) emission represents an attractive alternative to measure this fundamental parameter. In this study, a single-shot high-energy γ-ray spectrometer with sensitivity ranging from 0.5 MeV to 7 MeV was developed, allowing to estimate the γ-ray spectrum in the fast ignition.

Published
2014
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