JOPSS - Search Results

Journal Articles

Nonlinear categorization of the energetic-beam-driven instability with drag and diffusion

Lesur, M.*; Idomura, Yasuhiro

Nuclear Fusion, 52(9), p.094004_1 - 094004_11, 2011/09

https://doi.org/10.1088/0029-5515/52/9/094004

Times Cited Count：27 Percentile：74.39(Physics, Fluids & Plasmas)

Journal Articles

Estimation of kinetic parameters based on chirping Alfvn Eigenmodes

Lesur, M.*; Idomura, Yasuhiro; Shinohara, Koji; Garbet, X.*

Proceedings of 23rd IAEA Fusion Energy Conference (FEC 2010) (CD-ROM), 8 Pages, 2011/03

Alfvn Eigenmodes (AEs) with frequency sweeping (chirping AEs) are analyzed based on the so-called Berk-Breizman (BB) model. Kinetic parameter regimes with chirping nonlinear solutions are delimited, and a new quasi-periodic chirping regime is found, where the quasi-period of chirping events depends on the linear growth rate. Fundamental kinetic parameters such as the linear drive and the external damping rate are estimated by fitting nonlinear chirping characteristics between the experiment and the BB model. This approach is applied to Toroidicity-induced AEs on JT-60U, which suggests the existence of modes far from marginal stability. Two collision models are considered, and it is shown that dynamical friction and velocity-space diffusion are essential to reproduce nonlinear features observed in experiments. The results are validated by recovering measured growth and decay of perturbation amplitude, and by estimating collision frequencies from experimental equilibrium data.

Journal Articles

Spectroscopic determination of kinetic parameters for frequency sweeping Alfvn eigenmodes

Lesur, M.*; Idomura, Yasuhiro; Shinohara, Koji; Garbet, X.*; JT-60 Team

Physics of Plasmas, 17(12), p.122311_1 - 122311_9, 2010/12

https://doi.org/10.1063/1.3500224

Times Cited Count：31 Percentile：75.59(Physics, Fluids & Plasmas)

Journal Articles

Fully nonlinear features of the energetic beam-driven instability

Lesur, M.*; Idomura, Yasuhiro; Garbet, X.*

Physics of Plasmas, 16(9), p.092305_1 - 092305_12, 2009/09

https://doi.org/10.1063/1.3234249

Times Cited Count：38 Percentile：79.68(Physics, Fluids & Plasmas)

JAEA Reports

Kinetic simulations of electrostatic plasma waves using Cubic-Interpolated-Propagation scheme

Lesur, M.*; Idomura, Yasuhiro; Tokuda, Shinji

JAEA-Research 2006-089, 29 Pages, 2007/01

JAEA-Research-2006-089.pdf:1.67MB

Kinetic properties of small amplitude waves in an electron plasma are studied using analytic and numerical calculations based on the Vlasov-Poisson system. The dispersion relation of plasma waves in a Maxwellian plasma is solved using Laplace-Fourier transform, and it is shown that waves decay in time by Landau damping. A simulation code for solving the Vlasov-Poisson system in phase space is developed using the Cubic-Interpolated-Propagation (CIP) scheme, and Landau damping is successfully calculated numerically. Finally, the stability of an electron plasma with a beam component is discussed by applying these analytic and numerical approaches.

Oral presentation

One dimensional plasma kinetic simulation of wave-particle interactions

Lesur, M.*; Idomura, Yasuhiro

no journal, ,

A new Vlasov code is developed for simulating one dimensional (1D) electron plasma. The physical validity of the code is demonstrated by studying linear and nonlinear features of the wave-particle interactions in Langmuir waves excited from the bump-on-tail instability.

Oral presentation