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Journal Articles

The Role of collision ionization of K-shell ions in nonequilibrium plasmas produced by the action of super strong, ultrashort PW-class laser pulses on micron-scale argon clusters with intensity up to 5 $$times$$ 10$$^{21}$$ W/cm$$^{2}$$

Skobelev, I. Yu.*; Ryazantsev, S. N.*; Kulikov, R. K.*; Sedov, M. V.*; Filippov, E. D.*; Pikuz, S. A.*; Asai, Takafumi*; Kanasaki, Masato*; Yamauchi, Tomoya*; Jinno, Satoshi; et al.

Photonics (Internet), 10(11), p.1250_1 - 1250_11, 2023/11

 Times Cited Count:0 Percentile:0.00(Optics)

It is challenging to clearly distinguish the impacts of the optical field and collisional ionization in the evolution of the charge state of a plasma produced when matter interacts with high-intensity laser pulses. In this work, time-dependent calculations of plasma kinetics are used to show that it is possible only when low-density gaseous targets with sufficiently small clusters are used. In the case of Ar plasma, the upper limit of the cluster radius was estimated to be $$R_0 = 0.1 mu$$m.

Journal Articles

High dynamic range multi-channel cross-correlator for single-shot temporal contrast measurement

Kon, Akira; Nishiuchi, Mamiko; Kiriyama, Hiromitsu; Ogura, Koichi; Mori, Michiaki; Sakaki, Hironao; Kando, Masaki; Kondo, Kiminori

Journal of Physics; Conference Series, 717, p.012103_1 - 012103_4, 2016/05

 Times Cited Count:2 Percentile:66.09(Physics, Applied)

Journal Articles

High-contrast, high-intensity petawatt-class laser and applications

Kiriyama, Hiromitsu; Mori, Michiaki; Pirozhkov, A. S.; Ogura, Koichi; Sagisaka, Akito; Kon, Akira; Esirkepov, T. Z.; Hayashi, Yukio; Kotaki, Hideyuki; Kanasaki, Masato*; et al.

IEEE Journal of Selected Topics in Quantum Electronics, 21(1), p.1601118_1 - 1601118_18, 2015/01

 Times Cited Count:63 Percentile:95.12(Engineering, Electrical & Electronic)

This paper reviews the development of a high-contrast high-intensity petawatt-class Ti:sapphire chirped-pulse amplification (CPA) laser for research on high field science. We discuss in detail the design, performance and characterization of the laser. We also describe the on-going upgrade of the laser system and some applications for the laser in relativistic dominated laser-matter interactions.

Oral presentation

Status and implementation of J-KAREN laser upgrade

Kiriyama, Hiromitsu; Mori, Michiaki; Kon, Akira; Nishiuchi, Mamiko; Sakaki, Hironao; Ogura, Koichi; Fukuda, Yuji; Pirozhkov, A. S.; Sagisaka, Akito; Esirkepov, T. Z.; et al.

no journal, , 

We present the on-going upgrade of our high intensity laser system (J-KAREN laser system) in JAEA for higher energy and higher repetition rate operation as an invited talk. We discuss the status and implementation of the upgrade, including system design, evaluation of the components in the system, and the expected performance and characterization of the laser.

Oral presentation

Study for laser-driven particle acceleration

Sagisaka, Akito; Ogura, Koichi; Pirozhkov, A. S.; Nishikino, Masaharu; Kon, Akira; Nishiuchi, Mamiko; Esirkepov, T. Z.; Kando, Masaki; Kawachi, Tetsuya; Kondo, Kiminori; et al.

no journal, , 

High-intensity laser and thin-foil interactions produce high-energy particles and hard X-ray. A proton beam driven by a high-intensity laser has received attention as a ion source for medical and other applications. We have performed high energy laser-matter interaction experiments using a thin-foil target irradiated by LFEX laser at Osaka University. The three beams were focused at a thin-foil target. The maximum proton energy of $$sim$$40 MeV energy were observed at the total laser energy of $$sim$$1 kJ. The proton acceleration experiment with plasma mirror are started.

Oral presentation

Neutron yield of $$^{7}$$Li(p,n)$$^{7}$$Be reaction with laser-driven proton

Ogura, Koichi; Sakaki, Hironao; Nishiuchi, Mamiko; Sagisaka, Akito; Fukuda, Yuji; Pirozhkov, A. S.; Esirkepov, T. Z.; Kon, Akira; Kanasaki, Masato; Kondo, Kiminori

no journal, , 

Acceleration of protons to high kinetic energy in plasmas induced by high intensity laser pulses has been investigated. Many interesting applications for energetic protons can be considered such as laser-driven ion beam radiotherapy, proton-induced fast ignition, isotope production, neutron source, etc. One of the neutron generation methods uses a dual target. The angular distribution and energy spectrum of the neutrons depend on the converter material, energy, and ion species. We report on an estimation of neutron yield of a zero degree direction from a lithium neutron converter. As the protons propagate in the lithium converter, their energy is depleted in accordance with the continuous slowing down approximation. The neutron yield of zero degree direction was obtained from the experimental cross section for the $$^{7}$$Li(p,n)$$^{7}$$Be reaction.

Oral presentation

J-KAREN-P upgrade and perspective on high field sciences

Kando, Masaki; Bulanov, S. V.; Esirkepov, T. Z.; Fukuda, Yuji; Hayashi, Yukio; Kanasaki, Masato; Kiriyama, Hiromitsu; Koga, J. K.; Kon, Akira; Kondo, Kiminori; et al.

no journal, , 

Oral presentation

Recent advances on the J-KAREN laser upgrade

Kiriyama, Hiromitsu; Mori, Michiaki; Pirozhkov, A. S.; Ogura, Koichi; Nishiuchi, Mamiko; Kando, Masaki; Sakaki, Hironao; Kon, Akira; Kanasaki, Masato; Tanaka, Hirotaka; et al.

no journal, , 

We report recent progress on the J-KAREN laser upgrade to realize 10$$^{22}$$ W/cm$$^{2}$$ intensity at 0.1 Hz. Our current high-spatiotemporal-quality broadband pulses of over 20 J will be further amplified in the final amplifier.

Oral presentation

Proton generation from thin-foil with high-intensity laser

Sagisaka, Akito; Ogura, Koichi; Nishikino, Masaharu; Pirozhkov, A. S.; Kawachi, Tetsuya; Nishiuchi, Mamiko; Kon, Akira; Kando, Masaki; Kondo, Kiminori; Arikawa, Yasunobu*; et al.

no journal, , 

no abstracts in English

Oral presentation

Multi pass cross-correlator for single-shot laser pulse contrast measurement

Kon, Akira; Nishiuchi, Mamiko; Kiriyama, Hiromitsu; Sakaki, Hironao; Fukuda, Yuji; Kando, Masaki; Kondo, Kiminori

no journal, , 

no abstracts in English

Oral presentation

High field sciences explored with high-peak-power lasers at JAEA

Kando, Masaki; Bulanov, S. V.; Esirkepov, T. Z.; Faenov, A.*; Fukuda, Yuji; Hayashi, Yukio; Kiriyama, Hiromitsu; Koga, J. K.; Kon, Akira; Kondo, Kiminori; et al.

no journal, , 

Oral presentation

J-KAREN laser upgrade and perspectives

Pirozhkov, A. S.; Kiriyama, Hiromitsu; Mori, Michiaki; Nishiuchi, Mamiko; Fukuda, Yuji; Kotaki, Hideyuki; Ogura, Koichi; Sagisaka, Akito; Sakaki, Hironao; Hayashi, Yukio; et al.

no journal, , 

Oral presentation

Prospects of J-KAREN upgrade and high field science

Kando, Masaki; Bolton, P.; Bulanov, S. V.; Esirkepov, T. Z.; Fukuda, Yuji; Hayashi, Yukio; Kanasaki, Masato; Kawachi, Tetsuya; Kiriyama, Hiromitsu; Koga, J. K.; et al.

no journal, , 

Oral presentation

Development of radiation resistant cable

Ukon, Seiichi*; Takeda, Osamu; Morishita, Norio; Idesaki, Akira; Takano, Kazuhiko*; Ishida, Katsuyoshi*

no journal, , 

JP, 2008-235393   Patent publication (In Japanese)

no abstracts in English

Oral presentation

High-field sciences explored with the upgraded J-KAREN-P; Current status and perspective

Kando, Masaki; Bulanov, S. V.; Esirkepov, T. Z.; Fukuda, Yuji; Hayashi, Yukio; Kanasaki, Masato; Kiriyama, Hiromitsu; Koga, J. K.; Kon, Akira; Kondo, Kiminori; et al.

no journal, , 

Oral presentation

Current status of J-KAREN laser upgrade and intense laser activities around the world

Kiriyama, Hiromitsu; Mori, Michiaki; Pirozhkov, A. S.; Ogura, Koichi; Nishiuchi, Mamiko; Kando, Masaki; Sakaki, Hironao; Kishimoto, Maki; Miyasaka, Yasuhiro; Kon, Akira; et al.

no journal, , 

We report on recent progress on the J-KAREN laser upgrade to realize 10$$^{22}$$ W/cm$$^{2}$$ intensity at 0.1 Hz. Our current high-spatiotemporal-quality broadband pulse from the front end is amplified in the final amplifier to over 55 J. We plan to mention the future prospects. We also introduce ultra-high intensity lasers worldwide.

Oral presentation

High dynamic range single-shot temporal contrast measurement for ultra-high intensity laser pulse

Kon, Akira; Nishiuchi, Mamiko; Kiriyama, Hiromitsu; Ogura, Koichi; Mori, Michiaki; Sakaki, Hironao; Kando, Masaki; Kondo, Kiminori

no journal, , 

no abstracts in English

Oral presentation

Laser plasma interaction and the ion acceleration experiments by high contrast high intensity laser J-KAREN-P system

Nishiuchi, Mamiko; Sakaki, Hironao; Pirozhkov, A. S.; Sagisaka, Akito; Kon, Akira; Fukuda, Yuji; Kiriyama, Hiromitsu; Dover, N.*; Sekiguchi, Kentaro; Ogura, Koichi; et al.

no journal, , 

Petawatt class laser systems are in nowadays almost ready to work in all over the world. High energy particles accelerated by the interaction between laser pulses from high intensity laser system and the material shows interesting and particular parameters. Therefore those attract many fields of applications. High contrast and ultra high intensity laser system J-KAREN at KPSI is now under upgrading for achieving highest energy ion beams. No laser system with pulse duration less than 100 fs has demonstrated 100 MeV class proton acceleration in the world. To achieve high energy ions requires higher intensity laser on the target. We report on this presentation the status of the upgrading and the experimental results obtained at the first light experiment.

Oral presentation

High dynamic range multi-channel cross-correlator for single-shot time contrast measurement

Kon, Akira; Nishiuchi, Mamiko; Kiriyama, Hiromitsu; Sakaki, Hironao; Ogura, Koichi; Fukuda, Yuji; Kando, Masaki; Kondo, Kiminori

no journal, , 

Oral presentation

Recent progress on an upgrade of the J-KAREN laser at JAEA

Kiriyama, Hiromitsu; Mori, Michiaki; Pirozhkov, A. S.; Ogura, Koichi; Nishiuchi, Mamiko; Kando, Masaki; Sakaki, Hironao; Kon, Akira; Mocek, T.*; Kanasaki, Masato*; et al.

no journal, , 

We present recent progress on the J-KAREN laser upgrade to realize 10$$^{22}$$ W/cm$$^{2}$$ intensity at 0.1 Hz as an invited talk at CLEO-PR 2015. Our current high-spatiotemporal-quality broadband pulse from the front end is amplified in the final amplifier to over 55 J at this moment. We plan to mention the detailed design, performance and the future prospects.

26 (Records 1-20 displayed on this page)