Nonlinear wakefields and electron injection in cluster plasma
Nonlinear wakefields and electron injection in cluster plasma
复制标题
DOI：
10.1103/physrevaccelbeams.23.093501
复制
发表时间：
2020-07
期刊：
影响因子：
--
通讯作者：
M. Mayr;B. Spiers;R. Aboushelbaya;R. Paddock;J. Sadler;Charles Sillett;Robin H. W. Wang;Karl Krushelnick;P. Norreys
中科院分区：
文献类型：
--
作者：
M. Mayr;B. Spiers;R. Aboushelbaya;R. Paddock;J. Sadler;Charles Sillett;Robin H. W. Wang;Karl Krushelnick;P. Norreys
激光和光束驱动的尾流场有望在未来应用的粒子加速器中增加几个数量级的电场梯度。需要探索的关键领域包括产生的光束的发射特性和克服等离子体中的消相限制。本文利用高分辨率二维细胞内粒子模拟，首次深入研究了非均匀团簇等离子体在尾流场结构中的自注入机制。由高压气体射流喷出的气体形成的典型结构，其直径远小于激光波长。结论性的证据提供了潜在的机制，导致粒子捕获，比较均匀和集群等离子体的情况。通过改变团簇参数，发现加速电子束的性质是可调的。该机制解释了与大横向动量和能量配对的增强束流电荷，这对betatron x射线通量有影响。最后，讨论了团簇对高功率激光传输特性的影响。
Laser and beam driven wakefields promise orders of magnitude increases in electric field gradients for particle accelerators for future applications. Key areas to explore include the emittance properties of the generated beams and overcoming the dephasing limit in the plasma. In this paper, the first in-depth study of the self-injection mechanism into wakefield structures from non-homogeneous cluster plasmas is provided using high-resolution two dimensional particle-in-cell simulations. The clusters which are typical structures caused by ejection of gases from a high-pressure gas jet have a diameter much smaller than the laser wavelength. Conclusive evidence is provided for the underlying mechanism that leads to particle trapping, comparing uniform and cluster plasma cases. The accelerated electron beam properties are found to be tunable by changing the cluster parameters. The mechanism explains enhanced beam charge paired with large transverse momentum and energy which has implications for the betatron x-ray flux. Finally, the impact of clusters on the high-power laser propagation behavior is discussed.