Intense laser driven collision-less shock and ion acceleration in magnetized plasmas

9th International Conference on Inertial Fusion Sciences and Applications

Mima, K.^1 ; Jia, Q.^2 ; Cai, H.B.^2 ; Taguchi, T.^3 ; Nagatomo, H.^4 ; Sanz, J.R.^5 ; Honrubia, J.^5

Graduate School for the Creation of New Photonics Industries, Osaka, Japan^1

HEDPS, Center for Applied Physics and Technology, Peking University, Institute of Applied Physics and Computational Mathematics, Beijing, China^2

Faculty of Engineering, Setunan University, Osaka, Japan^3

Institute of Laser Engineering, Osaka University, Japan^4

School of Aeronautics, University Politecnica de Madrid, Spain^5

关键词: External magnetic field;    Intense short pulse lasers;    Ion accelerations;    Longitudinal magnetic fields;    Magnetized plasmas;    Radiation pressure;    Shock acceleration;    Strong magnetic fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/717/1/012070/pdf
DOI  :  10.1088/1742-6596/717/1/012070

来源: IOP

【 摘 要 】

The generation of strong magnetic field with a laser driven coil has been demonstrated by many experiments. It is applicable to the magnetized fast ignition (MFI), the collision-less shock in the astrophysics and the ion shock acceleration. In this paper, the longitudinal magnetic field effect on the shock wave driven by the radiation pressure of an intense short pulse laser is investigated by theory and simulations. The transition of a laminar shock (electro static shock) to the turbulent shock (electromagnetic shock) occurs, when the external magnetic field is applied in near relativistic cut-off density plasmas. This transition leads to the enhancement of conversion of the laser energy into high energy ions. The enhancement of the conversion efficiency is important for the ion driven fast ignition and the laser driven neutron source. It is found that the total number of ions reflected by the shock increases by six time when the magnetic field is applied.