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272 results on '"Tanaka, K.A."'

4. Integrated experiments of fast ignition targets by Gekko-XII and LFEX lasers

Author

Shiraga, H., Fujioka, S., Nakai, M., Watari, T., Nakamura, H., Arikawa, Y., Hosoda, H., Nagai, T., Koga, M., Kikuchi, H., Ishii, Y., Sogo, T., Shigemori, K., Nishimura, H., Zhang, Z., Tanabe, M., Ohira, S., Fujii, Y., Namimoto, T., Sakawa, Y., Maegawa, O., Ozaki, T., Tanaka, K.A., Habara, H., Iwawaki, T., Shimada, K., Nagatomo, H., Johzaki, T., Sunahara, A., Murakami, M., Sakagami, H., Taguchi, T., Norimatsu, T., Homma, H., Fujimoto, Y., Iwamoto, A., Miyanaga, N., Kawanaka, J., Jitsuno, T., Nakata, Y., Tsubakimoto, K., Sueda, K., Morio, N., Matsuo, S., Kawasaki, T., Sawai, K., Tsuji, K., Murakami, H., Kanabe, T., Kondo, K., Kodama, R., Sarukura, N., Shimizu, T., Mima, K., and Azechi, H.

Published
2012
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6. Present states and future prospect of fast ignition realization experiment (FIREX) with Gekko and LFEX Lasers at ILE

Author

Koga, Mayuko, Arikawa, Y., Azechi, H., Fujimoto, Y., Fujioka, S., Habara, H., Hironaka, Y., Homma, H., Hosoda, H., Jitsuno, T., Johzaki, T., Kawanaka, J., Kodama, R., Mima, K., Miyanaga, N., Murakami, M., Nagatomo, H., Nakai, M., Nakata, Y., Nakamura, H., Nishimura, H., Norimatsu, T., Sakawa, Y., Sarukura, N., Shigemori, K., Shiraga, H., Shimizu, T., Takabe, H., Tanabe, M., Tanaka, K.A., Tanimoto, T., Tsubakimoto, T., Watari, T., Sunahara, A., Isobe, M., Iwamoto, A., Mito, T., Motojima, O., Ozaki, T., Sakagami, H., Taguchi, T., Nakao, Y., Cai, H., Key, M., Norreys, P., and Pasley, J.

Published
2011
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11. Planar shock wave generated by uniform irradiation from two overlapped partially coherent laser beams

Author

Ozaki, N., Sasatani, Y., Kishida, K., Nakano, M., Miyanaga, M., Nagai, K., Nishihara, K., Norimatsu, T., Tanaka, K.a., Fujimoto, Y., Wakabayashi, K., Hattori, S., Tange, T., Kondo, K., Yoshida, M., Kozu, N., Ishiguchi, M., and Takenaka, H.

Subjects
Irradiation -- Usage, Laser beams -- Usage, Physics
Abstract

A new laser irradiation method is proposed to produce uniform laser irradiation of target or flyer plates.

Published
2001

13. Flyer acceleration by a high-power KrF laser with a long pulse duration

Author

Kadono, T., Yoshida, M., Takahashi, E., Matsushima, I., Owadano, Y., Ozaki, N., Fukita, K., Nakano, M., Tanaka, K.A., Takenaka, H., and Kondo, K.

Subjects
Irradiation -- Usage, Laser materials, Effect of radiation on -- Research, Physics
Abstract

High power laser irradiation using the ASHURA system is described.

Published
2000

15. Roadmap on photonic, electronic and atomic collision physics: I. Light-matter interaction

Author

Ueda K., Sokell E., Schippers S., Aumayr F., Sadeghpour H., Burgdörfer J., Lemell C., Tong X.-M., Pfeifer T., Calegari F., Palacios A., Martin F., Corkum P., Sansone G., Gryzlova E.V., Grum-Grzhimailo A.N., Piancastelli M.N., Weber P.M., Steinle T., Amini K., Biegert J., Berrah N., Kukk E., Santra R., Müller A., Dowek D., Lucchese R.R., McCurdy C.W., Bolognesi P., Avaldi L., Jahnke T., Schöffler M.S., Dörner R., Mairesse Y., Nahon L., Smirnova O., Schlathölter T., Campbell E.E.B., Rost J.-M., Meyer M., Tanaka K.A.

Published
2019

16. Microcracks, spall and fracture in glass: a study using short pulsed laser shock waves

Author

Li, Xin-Zen, Nakano, M., Yamauchi, Y., Kishida, K., and Tanaka, K.A.

Subjects
Glass -- Fracture, Fracture mechanics -- Models, Physics
Abstract

A meso scale failure model of nucleation, growth and percolation has been developed from a meso mechanical study of microcrack behaviour, particularly the process leading from microcracking to macro failure. The model is characterized by a randomly generated microcrack field, as well as by simultaneous percolation statistics in time iteration. In laser loading experiments, the crack velocity was seen to obey the terminal velocity rule quantitatively, and there was extensive evidence of microcrack activity.

Published
1998

17. Roadmap on photonic, electronic and atomic collision physics: I. Light-matter interaction

Author

Ueda K., Sokell E., Schippers S., Aumayr F., Sadeghpour H., Burgdörfer J., Lemell C., Tong X.-M., Pfeifer T., Calegari F., Palacios A., Martín, Fernando, Corkum P., Sansone G., Gryzlova E.V., Grum-Grzhimailo A.N., Piancastelli M.N., Weber P.M., Steinle T., Amini K., Biegert J., Berrah N., Kukk E., Santra R., Müller A., Dowek D., Lucchese R.R., McCurdy C.W., Bolognesi P., Avaldi L., Jahnke T., Schöffler M.S., Dörner R., Mairesse Y., Nahon L., Smirnova O., Schlathölter T., Campbell E.E.B., Rost J.-M., Meyer M., Tanaka K.A., Ueda K., Sokell E., Schippers S., Aumayr F., Sadeghpour H., Burgdörfer J., Lemell C., Tong X.-M., Pfeifer T., Calegari F., Palacios A., Martín, Fernando, Corkum P., Sansone G., Gryzlova E.V., Grum-Grzhimailo A.N., Piancastelli M.N., Weber P.M., Steinle T., Amini K., Biegert J., Berrah N., Kukk E., Santra R., Müller A., Dowek D., Lucchese R.R., McCurdy C.W., Bolognesi P., Avaldi L., Jahnke T., Schöffler M.S., Dörner R., Mairesse Y., Nahon L., Smirnova O., Schlathölter T., Campbell E.E.B., Rost J.-M., Meyer M., and Tanaka K.A.

Published
2019

18. Enhanced energy coupling by using structured nano-wire targets

Author

Habara H., Mishima Y., Nakanii N., Honda S., Katayama M., Gremillet L., Willingale L., Maksimchuk A., Krushelnick K., and Tanaka K.A.

Subjects
Physics, QC1-999
Abstract

We have investigated the interaction of ultra intense laser light with a carbon nanotube (CNT) target. The experimental results show an increased electron acceleration and a very low laser reflection as compared to non-structured targets. In addition, interferograms show very weak plasma expansion in front of the CNT target whereas the flat target creates a considerable amount of preformed plasma. A 2-D PIC calculation indicates that high laser absorption is possible via a Brunel mechanism following the ponderomotive heating in the expanded plasma between nanotubes.

Published
2013
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19. Implosion and heating experiments of fast ignition targets by Gekko-XII and LFEX lasers

Author

Shiraga H., Fujioka S., Nakai M., Watari T., Nakamura H., Arikawa Y., Hosoda H., Nagai T., Koga M., Kikuchi H., Ishii Y., Sogo T., Shigemori K., Nishimura H., Zhang Z., Tanabe M., Ohira S., Fujii Y., Namimoto T., Sakawa Y., Maegawa O., Ozaki T., Tanaka K.A., Habara H., Iwawaki T., Shimada K., Key M., Norreys P., Pasley J., Nagatomo H., Johzaki T., Sunahara A., Murakami M., Sakagami H., Taguchi T., Norimatsu T., Homma H., Fujimoto Y., Iwamoto A., Miyanaga N., Kawanaka J., Kanabe T., Jitsuno T., Nakata Y., Tsubakimoto K., Sueda K., Kodama R., Kondo K., Morio N., Matsuo S., Kawasaki T., Sawai K., Tsuji K., Murakami H., Sarukura N., Shimizu T., Mima K., and Azechi H.

Subjects
Physics, QC1-999
Abstract

The FIREX-1 project, the goal of which is to demonstrate fuel heating up to 5 keV by fast ignition scheme, has been carried out since 2003 including construction and tuning of LFEX laser and integrated experiments. Implosion and heating experiment of Fast Ignition targets have been performed since 2009 with Gekko-XII and LFEX lasers. A deuterated polystyrene shell target was imploded with the 0.53- μm Gekko-XII, and the 1.053- μm beam of the LFEX laser was injected through a gold cone attached to the shell to generate hot electrons to heat the imploded fuel plasma. Pulse contrast ratio of the LFEX beam was significantly improved. Also a variety of plasma diagnostic instruments were developed to be compatible with harsh environment of intense hard x-rays (γ rays) and electromagnetic pulses due to the intense LFEX beam on the target. Large background signals around the DD neutron signal in time-of-flight record of neutron detector were found to consist of neutrons via (γ,n) reactions and scattered gamma rays. Enhanced neutron yield was confirmed by carefully eliminating such backgrounds. Neutron enhancement up to 3.5 × 107 was observed. Heating efficiency was estimated to be 10–20% assuming a uniform temperature rise model.

Published
2013
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20. Absolute Kα line spectroscopy for cone-guided fast-ignition targets

Author

Nishimura H., Zhang Z., Namimoto T., Fujioka S., Koga M., Shiraga H., Ozaki T., Iwawaki T., Morioka T., Morita K., Habara H., Tanaka K.A., Nishikino M., Kawachi T., Sagisaka A., Orimo S., Pirozhkov A.S., Ogura K., Yogo A., Kiriyama H., Kondo K., Shimomura T., Kanazawa S., Okano Y., and Azechi H.

Subjects
Physics, QC1-999
Abstract

Absolute Kα line spectroscopy is proposed to study laser-plasma interactions taking place in cone-guided fast ignition targets. A transmission-type spectrometer was developed, and its absolute sensitivity was measured with laser-generated x-rays and radioisotopes, showing good agreement with theoretical predictions. The absolute yield of Au Kα line was mesured in the fast ignition experimental campaign perfomed at ILE, Osaka University. Assuming a single Maxwellian electron spectrum and one-way travel of hot electrons through the cone, energy transfer efficiency of incident LFEX laser to hot electrons was derived.

Published
2013
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21. Electron energy distributions through superdense matter by Monte-Carlo simulations

Author

Okabayashi A., Habara H., Yabuuchi T., and Tanaka K.A.

Subjects
Physics, QC1-999
Abstract

We have studied energy distribution of fast electrons passing through a highly compressed core plasma for fast ignition research in inertial confinement fusion. Recent PIC calculations indicate that the collective effect of electric and magnetic fields on the transport may be less significant than the binary collisions in the case of a high density fusion pellet. In order to understand the net effect of binary collisions in dense plasma, we calculate electron energy distributions at several viewing angles using an electromagnetic cascade Monte-Carlo simulation, EGS5, for estimation of the contribution of multi collisional process. Here, the construction of physical parameters in the code were taken from the calculation results given by 2 dimensional particle-in-cell simulations. In the result, the number of electrons detected on the laser axis within the range to 15 MeV significantly decreases for the superdense region (max: 1.6⋅1025[/cm3]) compared with the low density plasma. The reduction on the electron number decreases with increase of observation angles gradually and finally the number almost coincides more than 40 degrees.

Published
2013
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23. Development of new diagnostics based on LiF detector for pump-probe experiments

Author

Pikuz, T., primary, Faenov, A., additional, Ozaki, N., additional, Matsuoka, T., additional, Albertazzi, B., additional, Hartley, N.J., additional, Miyanishi, K., additional, Katagiri, K., additional, Matsuyama, S., additional, Yamauchi, K., additional, Habara, H., additional, Inubushi, Y., additional, Togashi, T., additional, Yumoto, H., additional, Ohashi, H., additional, Tange, Y., additional, Yabuuchi, T., additional, Yabashi, M., additional, Grum-Grzhimailo, A.N., additional, Casner, A., additional, Skobelev, I., additional, Makarov, S., additional, Pikuz, S., additional, Rigon, G., additional, Koenig, M., additional, Tanaka, K.A., additional, Ishikawa, T., additional, and Kodama, R., additional

Published
2018
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26. Stopping of α particles from the core in corona plasmas

Author

Mima, Kunioki, Tajima, Toshiki, Alvarez Ruiz, Jesus, Tanaka, K.A., Perlado Martín, José Manuel, Nagatomo, H., Johzaki, T., and Sunahara, A.

Subjects
Physics::Plasma Physics, Energía Nuclear, Optica
Abstract

In the laser fusion reactor design, the protection of first wall and the final optics from high energy ions is the key issue. So, it is necessary to predict the precise energy spectra of ions.In the previous reactor designs, the ion energy spectra were provided by the classical ion transport codes. However, this poster shows that the α particle spectrum is significantly modified by the anomalous process in ablated plasmas.

Published
2012

27. Ultraintense Lasers Applied to Laser Fusion Material Testing: Production of Ions, X rays and Neutrons

Author

Fernández-Tobias, J., Alvarez Ruiz, Jesus, Mima, K., Garoz, D., Rivera de Mena, Antonio, Gonzalez Arrabal, Raquel, Gordillo Garcia, Nuria, Perlado Martín, José Manuel, Tanaka, K.A., Kikuyama, K., Kono, T., Yabuuchi, T., Habara, H., Mishima, Y., Hirooka, Y., Ashikawathor, I., Kondo, K., Nishiuchi, M., Tanimoto, T., and Alexander, P.

Subjects
Physics::Plasma Physics, Astrophysics::High Energy Astrophysical Phenomena, Energía Nuclear
Abstract

Due to the particular characteristics of the fusion products, i.e. very short pulses (less than a few μs long for ions when arriving to the walls; less than 1 ns long for X-rays), very high fluences ( 10 13 particles/cm 2 for both ions and X rays photons) and broad particle energy spectra (up to 10 MeV ions and 100 keV photons), the laser fusion community lacks of facilities to accurately test plasma facing materials under those conditions. In the present work, the ability of ultraintese lasers to create short pulses of energetic particles and high fluences is addressed as a solution to reproduce those ion and X-ray bursts. Based on those parameters, a comparison between fusion ion and laser driven ion beams is presented and discussed, describing a possible experimental set-up to generate with lasers the appropriate ion pulses. At the same time, the possibility of generating X-ray or neutron beams which simulate those of laser fusion environments is also indicated and assessed under current laser intensities. It is concluded that ultraintense lasers should play a relevant role in the validation of materials for laser fusion facilities.

Published
2012

31. Approach to the study of fast electron transport in cylindrically imploded targets

Author

Del Sorbo, D., primary, Arikawa, Y., additional, Batani, D., additional, Beg, F., additional, Breil, J., additional, Chen, H., additional, Feugeas, J.L., additional, Fujioka, S., additional, Hulin, S., additional, Koga, M., additional, MacLean, H., additional, Morace, A., additional, Namimoto, T., additional, Nazarov, W., additional, Nicolai, Ph., additional, Nishimura, H., additional, Ozaki, T., additional, Sakaki, T., additional, Santos, J.J., additional, Spindloe, Ch., additional, Tanaka, K.A., additional, Vaisseau, X., additional, Veltcheva, M., additional, Yabuchi, T., additional, and Zhang, Z., additional

Published
2015
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42. Cherenkov radiation generated by a beam of electrons revisited

Author

Zheng, Jian, Yu, C.X., Zheng, Z.J., Tanaka, K.A., Zheng, Jian, Yu, C.X., Zheng, Z.J., and Tanaka, K.A.

Abstract

Copyright 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Physics of Plasmas, 12(9), 093105, 2005 and may be found at http://dx.doi.org/10.1063/1.2040178

Published
2005

50. Recent fast electron energy transport experiments relevant to fast ignition inertial fusion

Author

Norreys, P.A., primary, Scott, R.H.H., additional, Lancaster, K.L., additional, Green, J.S., additional, Robinson, A.P.L., additional, Sherlock, M., additional, Evans, R.G., additional, Haines, M.G., additional, Kar, S., additional, Zepf, M., additional, Key, M.H., additional, King, J., additional, Ma, T., additional, Yabuuchi, T., additional, Wei, M.S., additional, Beg, F.N., additional, Nilson, P., additional, Theobald, W., additional, Stephens, R.B., additional, Valente, J., additional, Davies, J.R., additional, Takeda, K., additional, Azechi, H., additional, Nakatsutsumi, M., additional, Tanimoto, T., additional, Kodama, R., additional, and Tanaka, K.A., additional

Published
2009
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