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1,553 results on '"Mima, K."'

301. Study of fast electron transport in hot dense matter using x-ray spectroscopy

Author

Nishimura, H, primary, Inubushi, Y, additional, Ochiai, M, additional, Kai, T, additional, Kawamura, T, additional, Fujioka, S, additional, Hashida, M, additional, Simizu, S, additional, Sakabe, S, additional, Kodama, R, additional, Tanaka, K A, additional, Kato, S, additional, Koike, F, additional, Nakazaki, S, additional, Nagatomo, H, additional, Johzaki, T, additional, and Mima, K, additional

Published
2005
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302. Foam materials for cryogenic targets of fast ignition realization experiment (FIREX)

Author

Nagai, Keiji, primary, Azechi, H, additional, Ito, F, additional, Iwamoto, A, additional, Izawa, Y, additional, Johzaki, T, additional, Kodama, R, additional, Mima, K, additional, Mito, T, additional, Nakai, M, additional, Nemoto, N, additional, Norimatsu, T, additional, Ono, Y, additional, Shigemori, K, additional, Shiraga, H, additional, and Tanaka, K. A, additional

Published
2005
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305. Review of progress in Fast Ignition

Author

Tabak, M., primary, Clark, D. S., additional, Hatchett, S. P., additional, Key, M. H., additional, Lasinski, B. F., additional, Snavely, R. A., additional, Wilks, S. C., additional, Town, R. P. J., additional, Stephens, R., additional, Campbell, E. M., additional, Kodama, R., additional, Mima, K., additional, Tanaka, K. A., additional, Atzeni, S., additional, and Freeman, R., additional

Published
2005
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306. Present Status of Fast Ignition Research and Prospects of FIREX Project

Author

Mima, K., primary, Azechi, H., additional, Johzaki, Y., additional, Kitagawa, Y., additional, Kodama, R., additional, Kozaki, Y., additional, Miyanaga, N., additional, Nagai, K., additional, Nagatomo, H., additional, Nakai, M., additional, Nishimura, H., additional, Norimatsu, T., additional, Shiraga, H., additional, Tanaka, K. A., additional, Izawa, Y., additional, Nakao, Y., additional, and Sakagami, H., additional

Published
2005
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307. Fast plasma heating in a cone-attached geometry—towards fusion ignition

Author

Kodama, R, primary, Azechi, H, additional, Fujita, H, additional, Habara, H, additional, Izawa, Y, additional, Jitsuno, T, additional, Jozaki, T, additional, Kitagawa, Y, additional, Krushelnick, K, additional, Matsuoka, T, additional, Mima, K, additional, Miyanaga, N, additional, Nagai, K, additional, Nagatomo, H, additional, Nakai, M, additional, Nishimura, H, additional, Norimatsu, T, additional, Norreys, P, additional, Shigemori, K, additional, Shiraga, H, additional, Sunahara, A, additional, Tanaka, K.A, additional, Tanpo, M, additional, Toyama, Y, additional, Tsubakimoto, K, additional, Yamanaka, T, additional, and Zepf, M, additional

Published
2004
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309. High-energy ion generation by short laser pulses

Author

Maksimchuk, A., primary, Flippo, K., additional, Krause, H., additional, Mourou, G., additional, Nemoto, K., additional, Shultz, D., additional, Umstadter, D., additional, Vane, R., additional, Bychenkov, V. Yu., additional, Dudnikova, G. I., additional, Kovalev, V. F., additional, Mima, K., additional, Novikov, V. N., additional, Sentoku, Y., additional, and Tolokonnikov, S. V., additional

Published
2004
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314. Present Status and Future Prospects of Laser Fusion Research at ILE Osaka University

Author

Mima, K, primary, Tanaka, K A, additional, Kodama, R, additional, Johzaki, T, additional, Nagatomo, H, additional, Shiraga, H, additional, Sentoku, Y, additional, Miyanaga, N, additional, Azechi, H, additional, Nakai, M, additional, Norimatu, T, additional, Nagai, K, additional, Sunanara, J, additional, Nishihara, K, additional, Taguchi, T, additional, and Sakagami, H, additional

Published
2004
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315. Simulations of anomalous stimulated Raman backscattering in a bounded plasma

Author

Miyamoto, Seiji, Mima, K, Škorić, Miloš M., Jovanović, Moma S., Miyamoto, Seiji, Mima, K, Škorić, Miloš M., and Jovanović, Moma S.

Abstract

Temporal pulsations, bursting and incoherence of stimulated Raman backscatter in a bounded, underdense plasma were observed in relativistic particle-in-cell simulations. We show that backscatter complexities, modulated and broadened spectra, follow a quasi-periodic and intermittent route to turbulence. We attribute a blue shift to relativistic decrease of plasma frequency. The bursting follows wave breaking, related to hot tail acceleration and bulk heating that further suppress Raman instability. Consistency with short-pulse experiments and simulations at high intensities is outlined.

Published
1998

316. Applications of laser produced ion beams to nuclear analysis of materials.

Author

Mima, K., Azuma, H., Fujita, K., Yamazaki, A., Okuda, C., Ukyo, Y., Kato, Y., Arrabal, R. Gonzalez, Soldo, F., Perlado, J. M., Nishimura, H., and Nakai, S.

Subjects
*LASER beams, *ION bombardment, *RADIOACTIVE substances, *ULTRASHORT laser pulses, *HEAVY metals, *CERAMIC materials, *LITHIUM-ion batteries, *ELECTROSTATIC accelerators
Abstract

Laser produced ion beams have unique characteristics which are ultra-short pulse, very low emittance, and variety of nuclear species. These characteristics could be used for analyzing various materials like low Z ion doped heavy metals or ceramics. Energies of laser produced ion beam extend from 0.1MeV to 100MeV. Therefore, various nuclear processes can be induced in the interactions of ion beams with samples. The ion beam driven nuclear analysis has been developed for many years by using various electrostatic accelerators. To explore the applicability of laser ion beam to the analysis of the Li ion battery, a proton beam with the diameter of ∼ 1.0 μm at Takasaki Ion Acceleration for Advanced Radiation Application (TIARA), JAEA was used. For the analysis, the PIGE (Particle-Induced Gamma Ray Emission) is used. The proton beam scans over Li battery electrode samples to diagnose Li density in the LiNi0.85Co0.15O2 anode. As the results, PIGE images for Li area density distributions are obtained with the spatial resolution of better than 1.5μm FWHM. By the Li PIGE images, the depth dependence of de-intercalation levels of Li in the anode is obtained. By the POP experiments at TIARA, it is clarified that laser produced ion beam is appropriate for the Li ion battery analysis. 41.85.Lc, 41.75.Jv, 42.62.cf. [ABSTRACT FROM AUTHOR]

Published
2012
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322. Present status and future prospect of Fast Ignition Realization Experiment (FIREX) Project at ILE, Osaka.

Author

Nishimura, H., Azechi, H., Mima, K., Fujimoto, Y., Fujioka, S., Homma, H., Jitsuno, T., Johzaki, T., Koga, M., Kawanaka, J., Kawasaki, T., Miyanaga, N., Murakami, H., Murakami, M., Nagatomo, H., Morio, N., Nagai, K., Nakai, M., Nakamura, T., and Nakazato, T.

Subjects
LASER fusion, LASER beams, FUEL, PLASMA gases, CONTROLLED fusion
Abstract

Thermonuclear ignition and subsequent burn are key physics for achieving laser fusion. In fast ignition, a highly compressed fusion fuel generated with multiple ns-laser beams is rapidly heated with a large energy, ps-laser pulse in prior to core disassembly. This scheme has a high potential to achieve ignition and burn since driver energy required for high fusion gain is predicted to be about one tenth of that needed for the central ignition scheme. In Japan, Fast Ignition Realization Experiment (FIREX) project has been started to clarify the physics of energy transport and deposition in the core plasma and to demonstrate fuel temperature of above 5 keV. After the success, FIREX-I will be followed by the second phase of the project (FIREX-II) to demonstrate ignition and burn. LFEX laser, designed to deliver a laser pulse of 10 kJ in 10 ps, are operational and the first phase of FIREX experiments has been stated. A new target is proposed to attain dense compression of fuel and improve laser-core coupling efficiency by adopting double-cone structure, a low-density inner liner, low-Z outer coating, and Br-doped fuel shell. In this paper, present status and near term prospects of the FIREX-I project will be reported together with activities on target designing, laser development, and plasma diagnostics. [ABSTRACT FROM AUTHOR]

Published
2010
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324. Basic and integrated studies for fast ignition

Author

Tanaka, K. A., primary, Kodama, R., additional, Mima, K., additional, Kitagawa, Y., additional, Fujita, H., additional, Miyanaga, N., additional, Nagai, K., additional, Norimatsu, T., additional, Sato, T., additional, Sentoku, Y., additional, Shigemori, K., additional, Sunahara, A., additional, Shozaki, T., additional, Tanpo, M., additional, Tohyama, S., additional, Yabuuchi, T., additional, Zheng, J., additional, Yamanaka, T., additional, Norreys, P. A., additional, Evanse, R., additional, Zepf, M., additional, Krushelnic, K., additional, Dangor, A., additional, Stephens, R., additional, Hatchett, S., additional, Tabak, M., additional, and Turner, R., additional

Published
2003
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326. Third Harmonic Generation Enhanced By Defective Plasma Bragg Gratings.

Author

Jun Zheng, Sheng, Z.-M., Zhang, J., and Mima, K.

Subjects
BRAGG gratings, PLASMA gases, LASER beams, PLASMA density, SIMULATION methods & models
Abstract

Plasma Bragg grating is composed of periodic variations of plasma and dielectric or vacuum. The characteristic of the bandgap of the plasma Bragg grating without or with defect is studied by theory and particle-in-cell (PIC) simulation. A one-dimensional (1D) defective plasma Bragg grating is proposed to increase the conversion efficiency of the third harmonic of the incident laser pulse as compared with a simple plane target. In such a structure, the high laser field intensity and high plasma density are produced by laser localization in defect states, from which the third harmonic is enhanced by one order of magnitude. [ABSTRACT FROM AUTHOR]

Published
2009
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328. Radiative Properties and Hydrodynamics of Laser Produced Tin Plasma for Efficient Extreme Ultraviolet Light Source.

Author

Nickles, P. V., Janulewicz, K. A., Fujioka, S., Nishimura, H., Nishihara, K., Tao, Y., Aota, T., Ando, T., Nagai, K., Norimatsu, T., Miyanaga, N., Izawa, Y., Mima, K., Tanuma, H., Ohnishi, H., Sunahara, A., Shimada, Y., and Sasaki, A.

Abstract

A laser-produced tin (Sn) plasma is an attractive extreme-ultraviolet(EUV) light source for the next generation lithography in terms of its brightness and compactness. Radiative properties and hydrodynamics of the laser-produced Sn plasmas are quite important for investigating the optimum conditions for EUV generation. Several experiments have been performed to clarify the above issues;(i) EUV spectra emitted from isolated Snq+ (5 < q < 15) ions and opacity spectrumof a 30-eV Sn plasma have been measured as fundamental data for accurate modelingradiation energy transport in plasmas, (ii) electron density profile in 13.5 nmemission dominant region of a laser-produced Sn plasma was measured with a laserinterferometer for understanding hydrodynamics of an EUV source plasma. (iii) benchmarking one-dimensional (1D) radiation-hydrodynamic simulation codewith multiple laser beam irradiated spherical 1D Sn plasma. Based on the experimentalresults and calculations, it was found that optically thinner plasma emits 13.5 nm light more efficiently. Optical depth of Sn plasma is actively controlledwith changing laser pulse duration and the use of low-density porous target. [ABSTRACT FROM AUTHOR]

Published
2007
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329. Control of Amplified Optical Parametric Fluorescence in Hybrid Chirped-pulse Amplification.

Author

Hama, Y., Kondo, K., Maeda, H., Zoubir, A., Kodama, R., Tanaka, K. A., and Mima, K.

Abstract

The amplified optical parametric fluorescence (AOPF) from optical parametric chirped pulse amplifier (OPCPA) was controlled by injecting a residual fundamental pulse of the seeded Q-switch Nd:YAG pumping laser as a quenching beam. The output pulse from the OPCPA was used as a seed pulse for Ti:sapphire chirped-pulse amplifier (CPA) system to generate up to 10 TW peak power with a high-contrast ratio. This intense laser pulse was focused on the supersonic Ar gas jet. High-energy electrons up to 30 MeV were observed. [ABSTRACT FROM AUTHOR]

Published
2007
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331. Quasi-static electromagnetic pulse generated by ultra-intense laser pulses

Author

Nakamura, T., Mima, K., Nakamura, T., and Mima, K.

Abstract

A solitary structure of quasi-static electromagnetic pulse is formed in moderate density plasmas by a propagation of ultra-intense and ultra-short laser pulse, which is formed after the laser pulse is depleted and slowly propagates in the laser propagation direction. The structure is sustained by huge magnetic pressure and compensating electric field which are in an electromagnetic equilibrium together with the plasma motion. The solitary structure is formed when the resonance condition is satisfied and laser intensity is high enough to induce huge magnetic field pressure.

Published
2009
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332. Electron sheath dynamics and structure in intense laser driven ion acceleration

Author

Ter-Avetisyan, S., Schnürer, M., Sokollik, T., Nickles, P. V., Sandner, W., Stein, U., Habs, D., Nakamura, T., Mima, K., Ter-Avetisyan, S., Schnürer, M., Sokollik, T., Nickles, P. V., Sandner, W., Stein, U., Habs, D., Nakamura, T., and Mima, K.

Abstract

The complex dynamical behavior of the electron sheath in laser driven ion acceleration leads to variations in ion beam pointing and ion energy modulation. These processes are derived from high resolution particle spectroscopy and 2D-PIC simulations. The phenomena arise from ion source movement if laser irradiation occurs at oblique incidence. Different laser absorption processes act in dependence on laser parameter which determines the ion acceleration.

Published
2009
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333. Fast heating of super-solid density plasmas towards laser fusion ignition

Author

Kodama, R, primary, Tanaka, K A, additional, Fujioka, S, additional, Fujita, H, additional, Habara, H, additional, Izawa, Y, additional, Jitsuno, T, additional, Kitagawa, Y, additional, Krushelnick, K, additional, Mima, K, additional, Miyanaga, N, additional, Nagai, K, additional, Norreys, P, additional, Norimatsu, T, additional, Shigemori, K, additional, Shiraga, H, additional, Toyama, Y, additional, Zepf, M, additional, and Yamanaka, T, additional

Published
2002
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336. Fast heating scalable to laser fusion ignition

Author

Kodama, R., primary, Shiraga, H., additional, Shigemori, K., additional, Toyama, Y., additional, Fujioka, S., additional, Azechi, H., additional, Fujita, H., additional, Habara, H., additional, Hall, T., additional, Izawa, Y., additional, Jitsuno, T., additional, Kitagawa, Y., additional, Krushelnick, K. M., additional, Lancaster, K. L., additional, Mima, K., additional, Nagai, K., additional, Nakai, M., additional, Nishimura, H., additional, Norimatsu, T., additional, Norreys, P. A., additional, Sakabe, S., additional, Tanaka, K. A., additional, Youssef, A., additional, Zepf, M., additional, and Yamanaka, T., additional

Published
2002
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341. Progress of fast ignitor studies and Petawatt laser construction at Osaka University

Author

Kitagawa, Y., primary, Sentoku, Y., additional, Akamatsu, S., additional, Mori, M., additional, Tohyama, Y., additional, Kodama, R., additional, Tanaka, K. A., additional, Fujita, H., additional, Yoshida, H., additional, Matsuo, S., additional, Jitsuno, T., additional, Kawasaki, T., additional, Sakabe, S., additional, Nishimura, H., additional, Izawa, Y., additional, Mima, K., additional, and Yamanaka, T., additional

Published
2002
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342. Imprint reduction in a plasma layer preformed with x-ray irradiation

Author

Nishikino, M., primary, Shiraga, H., additional, Miyanaga, N., additional, Ohnishi, N., additional, Shigemori, K., additional, Fujioka, S., additional, Nakai, M., additional, Nishimura, H., additional, Azechi, H., additional, Mima, K., additional, Takabe, H., additional, Nakai, S., additional, and Yamanaka, T., additional

Published
2002
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349. EUV and particle generations from laser-irradiated solid- and low-density targets

Author

Nishimura, H., Fujioka, S., Okuno, T., Tao, Y., Ueda, N., Ando, T., Aota, T., Yasuda, Y., Uchida, S., Shimada, Y., Yamaura, M., Hashimoto, K., Gu, Q., Nagai, K., Norimatsu, Y., Furukawa, H., Kang, Y. G., Sunahara, A., Gamada, K., Murakami, M., Nishihara, K., Miyanaga, N., Izawa, Y., Mima, K., Nishimura, H., Fujioka, S., Okuno, T., Tao, Y., Ueda, N., Ando, T., Aota, T., Yasuda, Y., Uchida, S., Shimada, Y., Yamaura, M., Hashimoto, K., Gu, Q., Nagai, K., Norimatsu, Y., Furukawa, H., Kang, Y. G., Sunahara, A., Gamada, K., Murakami, M., Nishihara, K., Miyanaga, N., Izawa, Y., and Mima, K.

Abstract

Properties of extreme ultraviolet (EUV) and particle emissions from laser-produced tin (Sn) plasma were experimentally investigated for use in industrial applications. Dependence of EUV emission on the initial thickness of Sn overcoat on a plastic sphere was studied to clarify the minimum mass needed to keep sufficient conversion to EUV and minimize plasma debris. EUV emission from low-density targets showed narrower spectra peaked at 13.5 nm, attributed to reduction of satellite line emissions in the spectrum foot and opacity broadening at the peak. It is shown that not only the EUV generation but also ion spectra are significantly affected by the Sn coat thicknesses.

Published
2006
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350. Driver development of IFE power plant in Japan – Collaborative process with industry and industrial applications

Author

Nakai, S., Yamanaka, M., Kitagawa, Y., Fujita, K., Heya, M., Mima, K., Izawa, Y., Nakatsuka, M., Murakami, M., Ueda, K., Sasaki, T., Mori, Y., Kanabe, T., Hiruma, T., Kan, H., Kawashima, T., Nakai, S., Yamanaka, M., Kitagawa, Y., Fujita, K., Heya, M., Mima, K., Izawa, Y., Nakatsuka, M., Murakami, M., Ueda, K., Sasaki, T., Mori, Y., Kanabe, T., Hiruma, T., Kan, H., and Kawashima, T.

Abstract

The typical specifications of the laser driver for a commercial IFE power plant are (1) total energy (MJ/pulse) with a tailored 20-40 ns pulse, (2) repetition operation (∼10 Hz), (3) efficiency (∼10%) with enough robustness and low cost. The key elements of the DPSSL driver technology are under development with HALNA. The HALNA 10 (High Average-power Laser for Nuclear-fusion Application) demonstrated 10 J $\times$10 Hz operation and the HALNA 100 (100 J $\times$10 Hz) is now under construction. By using the high average power and high intensity lasers, new industrial applications are being proceeded. The collaborative process for the development of high power laser with industry and for the industrial applications is effective and essential in the development of the laser driver for IFE power plant.

Published
2006
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