Collisionless shock wave and ion acceleration driven by ultra-intense laser under a strong magnetic field

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H03758
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Plasma science
• Research Institution: Setsunan University
• Principal Investigator: Taguchi Toshihiro 摂南大学, 理工学部, 教授 (90171595)
• Co-Investigator(Kenkyū-buntansha): 三間 圀興 光産業創成大学院大学, その他の研究科, 特任教授 (30033921) ; 城崎 知至 広島大学, 工学研究科, 准教授 (10397680)
• Co-Investigator(Renkei-kenkyūsha): Sakagami Hitoshi 核融合科学研, ヘリカル研究部, 教授 (30254452) ; Nagatomo Hideo 大阪大学, レーザー科学研究所, 准教授 (10283813) ; Sunahara Atsushi Purdue大学, CMUXE, 客員教授 (00370213)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: レーザープラズマ / 超高強度レーザー / 強磁場 / 無衝突衝撃波 / 高速点火核融合 / ビーム不安定性

Outline of Final Research Achievements

Propagation of charged particle beams in a magnetized high density plasmas has been intensively investigated by theory and simulation.
In the electron beam propagation under a strong magnetic field, we have found a new phenomenon, beam stagnation by a strong whistler wave. The physical mechanism for generation of such a large amplitude whistler wave has been clarified. The PIC simulations on ultra intense laser interaction with near critical density plasmas showed that two stream instability between high energy electrons and background electrons induces electromagnetic turbulence and the energy distribution becomes local Maxwellian due to the scattering by the electromagnetic fluctuations.
We also evaluated electron beam guiding effect by a strong magnetic field in an ignition-realization-class conditions in fast ignition laser fusion. We have confirmed that applied kilo-tesla-class magnetic field effectively guides the electron beam and then enhances the heating efficiency.

Free Research Field

プラズマ理工学