论文标题
通过在磁场使用时血浆中短相对论电子束序列激发的加速韦克菲尔德振幅的增加
Increase of amplitude of accelerating wakefield excited by sequence of short relativistic electron bunches in plasma at magnetic field use
论文作者
论文摘要
早些时候，作者发现了一种短相对论电子束序列的机制，这会导致韦克菲尔德的共振激发，即使束的重复频率与等离子频率不同。在这种情况下，频率的同步是由于堆积到相对于等离子体波的不良阶段的串联而恢复的。但是，在这种情况下，束会丢失，因此这不参与韦克菲尔德的激发。在本文中，使用数值模拟来研究电子束的动力学，并通过一系列短束相对论电子在磁化等离子体中对韦克菲尔德的激发。当使用磁场时，悬浮的束在一定时间后返回与该场相互作用的区域。在这种情况下，束的电子返回了田野的必要阶段，参与了韦克菲尔德的激发。同样，使用磁场会导致激发波的频率增加相对于束的重复频率。后者增加了维持共振的时间，因此导致激发韦克菲尔德的振幅增加。
Earlier, the authors found a mechanism for the sequence of short relativistic electron bunches, which leads to resonant excitation of the wakefield, even if the repetition frequency of bunches differs from the plasma frequency. In this case, the synchronization of frequencies is restored due to defocusing of the bunches which get into the bad phases with respect to the plasma wave. However, in this case, the bunches are lost, which as a result of this do not participate in the excitation of the wakefield. In this paper, numerical simulation was used to study the dynamics of electron bunches and the excitation of the wakefield in a magnetized plasma by a long sequence of short bunches of relativistic electrons. When a magnetic field is used, the defocussed bunches return to the region of interaction with the field after a certain time. In this case, the electrons of the bunches, returning to the necessary phases of the field, participate in the excitation of the wakefield. Also, the use of a magnetic field leads to an increase of the frequency of the excited wave relative to the repetition frequency of bunches. The latter increases the time for maintaining the resonance and, consequently, leads to an increase of the amplitude of the excited wakefield.
