This paper deals with electron acceleration by a laser pulse in a plasma with a static uniform magnetic field B_{*}. The laser pulse propagates perpendicular to the magnetic field lines with the polarization chosen such that (E_{laser}·B_{*})=0. The focus of the work is on the electrons with an appreciable initial transverse momentum that are unable to gain significant energy from the laser in the absence of the magnetic field due to strong dephasing. It is shown that the magnetic field can initiate an energy increase by rotating such an electron, so that its momentum becomes directed forward. The energy gain continues well beyond this turning point where the dephasing drops to a very small value. In contrast to the case of purely vacuum acceleration, the electron experiences a rapid energy increases with the analytically derived maximum energy gain dependent on the strength of the magnetic field and the phase velocity of the wave. The energy enhancement by the magnetic field can be useful at high laser amplitudes, a_{0}≫1, where the acceleration similar to that in the vacuum is unable to produce energetic electrons over just tens of microns. A strong magnetic field helps leverage an increase in a_{0} without a significant increase in the interaction length.

中文翻译：

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在强磁场中通过激光加速电子获得的能量。

本文通过在静态均匀磁场B _ {*}下的等离子体中的激光脉冲处理电子加速。激光脉冲垂直于磁场线传播，其极化选择为（E_ {laser}·B _ {*}）= 0。这项工作的重点是具有明显初始横向动量的电子，这些电子在由于强相移而没有磁场的情况下无法从激光器获得大量能量。示出了，磁场可以通过旋转这样的电子来引发能量增加，从而其动量变得向前。能量增益继续远远超过此转折点，在该转折点，相移下降到非常小的值。与纯真空加速的情况相反，电子经历快速能量增加，解析得出的最大能量增益取决于磁场强度和波的相速度。在较高的激光振幅a_ {0} ≫1时，磁场的能量增强作用可能非常有用，在这种情况下，类似于真空中的加速度无法产生仅几十微米的高能电子。强磁场有助于平衡a_ {0}的增加，而不会显着增加交互作用的长度。