Suppression of beam merging and hosing instabilities in magnetized fast ignition fusion

8th International Conference on Inertial Fusion Sciences and Applications

Taguchi, Toshihiro^1 ; Antonsen, Thomas M.^2 ; Mima, Kunioki^3

Department of Electric and Electronic Engineering, Setsunan University, Osaka, Japan^1

Institute for Research in Electronics and Applied Physics, University of Maryland, United States^2

Graduate School for the Creation of New Photonics Industries, Hamamatsu, Japan^3

关键词: Fast ignition fusion;    Hybrid simulation;    Magnetic field strengths;    Non-linear regimes;    Strong magnetic fields;    Transverse mode;    Two stream instability;    Two-dimensional waves;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/688/1/012117/pdf
DOI  :  10.1088/1742-6596/688/1/012117

来源: IOP

【 摘 要 】

The magnetized two-stream instability has been investigated in linear and nonlinear regimes. Using a linear analysis of the Vlasov equation in two dimensional wave number space, we studied the competition between modes with wave numbers parallel and transverse to the beam direction. In the analysis, it is found that a near transverse mode is still unstable even for large electron temperature. The nonlinear analysis is performed using a hybrid simulation code. When a sufficiently strong magnetic field is applied along the beam direction, the instabilities are well suppressed and the electron stream becomes laminar. When the magnetic field strength is not large enough, however, electron flow stagnates and the total number of beam electrons penetrating the plasma is largely reduced.