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Journal Articles

New epoch in the charged particle acceleration by relativistically intense laser radiation

Bulanov, S. V.

Plasma Physics and Controlled Fusion, 48(12B), p.B29 - B37, 2006/12

 Times Cited Count:21 Percentile:39.03(Physics, Fluids & Plasmas)

The development of the ultra-intense laser continues to open up new fields of physics. The laser accelerator development is now entering a new matured stage at which it becomes possible to manipulate in a controllable way the parameters of accelerated charged particle beams. The electron injection by breaking wake waves left by the laser pulse in underdense plasmas results in the quasi-mono-energetic beam production. The tailored multi-layer foil targets provide conditions for the high quality ion beam acceleration. Nonlinear interaction of co- and counter-propagating laser pulses in an underdense plasma can lead to super-intense electromagnetic pulse generation. A number of prominent applications are cited, including the charged particle injectors, the high energy physics, the bright sources of hard electromagnetic radiation and positrons.

Journal Articles

A Simulation study on stable current shutdown in non-inductive reversed shear tokamak discharges

Takei, Nahoko; Ushigome, Masahiro*; Suzuki, Takahiro; Nakamura, Yukiharu; Takase, Yuichi*

Europhysics Conference Abstracts (CD-ROM), 30I, 4 Pages, 2006/00

no abstracts in English

Journal Articles

Investigation of toroidal rotation as a result of reduction of toroidal magnetic field ripple by installing ferritic steel in JT-60U

Yoshida, Maiko; Koide, Yoshihiko; Takenaga, Hidenobu; Urano, Hajime; Oyama, Naoyuki; Kamiya, Kensaku; Sakamoto, Yoshiteru; Kamada, Yutaka; JT-60 Team

Europhysics Conference Abstracts (CD-ROM), 30I, 4 Pages, 2006/00

no abstracts in English

Journal Articles

Stabilization effects of wall and plasma rotation on resistive wall mode in JT-60U

Matsunaga, Go; Takechi, Manabu; Kurita, Genichi; Sakamoto, Yoshiteru; Koide, Yoshihiko; Isayama, Akihiko; Suzuki, Takahiro; Fujita, Takaaki; Aiba, Nobuyuki; Ozeki, Takahisa; et al.

Europhysics Conference Abstracts (CD-ROM), 30I, 4 Pages, 2006/00

no abstracts in English

Journal Articles

Characterization of H-mode pedestal width based on hydrogen and deuterium discharges in JT-60U

Urano, Hajime; Takizuka, Tomonori; Kamada, Yutaka; Oyama, Naoyuki; Takenaga, Hidenobu; JT-60 Team

Europhysics Conference Abstracts (CD-ROM), 30I, 4 Pages, 2006/00

Conducting the experiments on the H-modes in hydrogen (H) and deuterium (D) discharges, the edge non-dimensional parameter dependence of the H-mode pedestal width has been examined. However, the scalings of the pedestal width vary from machine to machine. This disagreement can be caused by the existing strong co-linearity between $$rho_mathrm{pol}$$ and $$beta_mathrm{pol}$$, which is hard to separate out in the peripheral region. In this study, to distinguish these variables, focusing on the mass dependence of $$rho_mathrm{pol}$$ ($$sim m^{0.5}$$), a pair of experiments in H and D plasmas were conducted. If the pedestal width were determined by $$rho_mathrm{pol}$$, it would be impossible to match the pedestal width while keeping the edge pressure gradient fixed between H and D plasmas. However, in the experiment, we obtained the same edge profiles for H and D discharges while the required power in the H plasma was $$sim 2$$ times larger than that in D plasma. This result indicates that the H-mode pedestal width does not remarkably depend on the plasma particle species or $$rho_mathrm{pol}$$.

Journal Articles

Enhanced ELMy H-mode performance with reduced toroidal field ripple in JT-60U

Oyama, Naoyuki; Urano, Hajime; Yoshida, Maiko; Takenaga, Hidenobu; Shinohara, Koji; Sakurai, Shinji; Masaki, Kei; Kamiya, Kensaku; Isayama, Akihiko; Suzuki, Takahiro; et al.

Europhysics Conference Abstracts (CD-ROM), 30I, 4 Pages, 2006/00

no abstracts in English

Journal Articles

Diagnostics of relativistic runaway electrons in a tokamak plasma based on laser inverse Compton scattering

Kawano, Yasunori; Kondoh, Takashi; Hatae, Takaki

Europhysics Conference Abstracts (CD-ROM), 30I, 4 Pages, 2006/00

no abstracts in English

Journal Articles

Impacts of particle fuelling on confinement and pedestal parameter in JT-60U

Takenaga, Hidenobu; Oyama, Naoyuki; Urano, Hajime; Kamiya, Kensaku; Miyo, Yasuhiko; Nishiyama, Tomokazu; Sasajima, Tadayuki; Masaki, Kei; Hiratsuka, Hajime; Ichige, Hisashi; et al.

Europhysics Conference Abstracts (CD-ROM), 30I, 4 Pages, 2006/00

no abstracts in English

Journal Articles

Observation of nonlinear processes between coherent fluctuations and turbulent fluctuations in the edge regions of JFT-2M and CHS

Nagashima, Yoshihiko*; Ito, Kimitaka*; Ito, Sanae*; Fujisawa, Akihide*; Hoshino, Katsumichi; Nagaoka, Kenichi*; Ejiri, Akira*; Takase, Yuichi*; Yagi, Masatoshi*; Shinohara, Koji; et al.

Europhysics Conference Abstracts (CD-ROM), 30I, 4 Pages, 2006/00

The results of the analyses of nonlinear processes in the plasma in JFT-2M tokamak and CHS machine are reported. In both machines, the measurements of the fluctuations were done by electrostatic probes. The obtained bicoherence and biphase from the potential data in JFT-2M were found to be close to the values obtained from a theoretical model of the interaction of the zonal flow and the drift wave turbulence. Therefore the experimentally obtained nonlinear interaction is considered to be that interaction of the zonal flow and the drift wave turbulence. By the analysis of the CHS H-mode plasma, a marked nonlinear interaction was found between a characteristic MHD magnetic fluctuation and density turbulence. By analysing the cross bispectrum of the density fluctuation and the potential fluctuation, it was found that the fluctuating particle flux is affected by the MHD oscillation. As stated above, we progressed in the investigation of the nonlinear processes of the edge plasmas.

Journal Articles

Conservative gyrokinetic Vlasov simulation using Morinishi scheme

Idomura, Yasuhiro; Ida, Masato; Tokuda, Shinji; Villard, L.*

Europhysics Conference Abstracts (CD-ROM), 30I, 4 Pages, 2006/00

A gyrokinetic simulation is an essential tool to study turbulent anomalous transport in tokamak plasmas, and a long time global simulation of driven turbulence in open system is highly desirable towards estimation and prediction of turbulent transport. However, poor conservation properties in conventional gyrokinetic simulations were problematic in such a long time simulation. To overcome this difficulty, a new conservative gyrokinetic code is developed using Morinishi scheme, which was originally developed for conservative simulations of neutral fluid turbulence. In the new code, in addition to the exact particle number conservation, the energy conservation is dramatically improved, and the scheme is robust in a long time simulation. In slab ion temperature gradient driven turbulence simulations, comparisons of the new code and a conventional particle code are presented.

Oral presentation

Radiation reaction effects in ultrahigh irradiance laser pulse interactions with multiple electrons

Koga, J. K.; Yamagiwa, Mitsuru

no journal, , 

When ultrahigh irradiance laser pulses interact with high energy electrons, the emission of radiation from these electrons can significantly effect the motion of the electrons themselves. We directly solve the interaction between multiple electrons numerically, which allows an accurate description of the dynamics. The fields acting on the electrons include the laser field and the Lienard-Wiechert field contribution from the other electrons. We will present results where the radiation reaction force is calculated by retaining the time histories of the higher order derivatives in both time and space of all the fields.

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