Kinetic analysis of high energy particle generation in magnetic field remnnections

提出了两个相互碰撞的磁化等离子体的动力学模型，用来研究粒子加速到很高的能量。利用相对论运动方程，计算了许多试验粒子的运动轨迹。结果表明，碰撞中心周围产生的静电场有效地加速了粒子的运动。粒子的最佳能量增益γ_S由磁场的曲率半径α、冲击波的运动速度β_p和实验粒子的初始位置S_o三个参数的互乘得到。这些参数的关系以γ_S=Aβ^3_p/4_a^2S_o的形式描述，其中A是常数值。这种加速机制适用于从实验室等离子体到星际等离子体的大范围高能粒子的产生。本文提出的机制是作者[1]提出的磁囚禁加速(MTA)的进一步研究。[1]S·Takeuchi，磁化等离子体激波的新粒子加速，Phys。等离子体12,102901 1-6(2005年)。

A kinetic model of two colliding magnetized plasmas is proposed to investigate an acceleration of particles to very high energy. By the use of the relativistic equations of motion, trajectories of many test particles are calculated. It is found that particles are effectively accelerated by a stationary electric field generated around the center of collision. An optimal energy gain γ_s of particle is given by the mutual product of three parameters, i.e. radius of curvature α of the magnetic field, moving velocity β_p of the shock wave and initial position S_o of the test particle. The relation of these parameters is described in the formγ_s= Aβ^3_p/4_a^2S_owhere A is a constant value. This acceleration mechanism is available for high-energy particle generation over the wide range from laboratory plasmas to interstellar ones. The mechanism presented here is an advanced study of the Magnetic Trapping Acceleration (MTA) which has been expressed by the author [1].[1] S. Takeuchi, New particle accelerations by magnetized plasma shock waves, Phys. Plasmas 12, 102901 1-6 (2005).