Hoshino 2007 Wakefield加速相对论激波的粒子为非热分布

主要内容:
文中先回顾了三类经典的加速机制（按照能量来源）：磁重联、激波加速（如费米机制）、大振幅的波的能量转化。文章模拟了大振幅的Wakefield，发现能很快将相对论激波中的粒子加速。

精彩摘抄:


文章信息:

arXiv:0709.1783 [ps, pdf, other]

Title: Wakefield Acceleration by Radiation Pressure in Relativistic Shock Waves

Authors: Masahiro Hoshino

Comments: Accepted in ApJ (5 Sept 2007)

Subjects: Astrophysics (astro-ph)

A particle acceleration mechanism by radiation pressure of precursor waves in a relativistic shock is studied. For a relativistic, perpendicular shock with the upstream bulk Lorentz factor of $\gamma_1 \gg 1$, large amplitude electromagnetic (light) waves are known to be excited in the shock front due to the synchrotron maser instability, and those waves can propagate towards upstream as precursor waves. We find that non-thermal, high energy electrons and ions can be quickly produced by an action of electrostatic wakefields generated by the ponderomotive force of the precursor waves. The particles can be quickly accelerated up to $\epsilon_{\rm max}/\gamma_1 m_e c^2 \sim \gamma_1$ in the upstream coherent wakefield region, and they can be further accelerated during the nonlinear stage of the wakefield evolution. The maximum attainable energy is estimated by $\epsilon_{\rm max}/\gamma_1 m_e c^2 \sim L_{\rm sys}/(c/\omega_{pe})$, where $L_{\rm sys}$ and $c/\omega_{pe}$ are the size of an astrophysical object and the electron inertial length, respectively.