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arXiv 0810.3822physics.plasm-ph
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电子束以一定角度注入laser尾流场

Electron bunch injection at an angle into a laser wakefield

M. J. H. Luttikhof, A. G. Khachatryan, F. A. van Goor, K. -J. Boller

摘要:

在激光尾流场加速器中,外部注入比等离子体波长长的电子束团可以产生能量扩展为几个百分点的飞秒超相对论束团。对不同结构的激光尾流场中的电子束团(如光阴极射频直线加速器产生的电子束团)注入进行了广泛研究。本文研究了一种新的外注入方式,即电子束团以小角度注入尾场。这样可以避免有质动力散射以及真空等离子体过渡区,这往往会破坏注入聚束。在我们的模拟中,激光脉冲动力学的影响也被考虑在内。结果表明,在一个角度注入可以提供压缩和加速电子束团小于2%的能量扩展。该方案的另一个优点是,它对注入聚束的尺寸的要求不那么严格,并且有可能捕获更多的电荷。

英文摘要:

External injection of electron bunches longer than the plasma wavelength in a laser wakefield accelerator can lead to the generation of femtosecond ultrarelativistic bunches with a couple of percent energy spread. Extensive study has been done on external electron bunch (e.g. one generated by a photo-cathode rf linac) injection in a laser wakefield for different configurations. In this paper we investigate a new way of external injection where the electron bunch is injected at a small angle into the wakefield. This way one can avoid the ponderomotive scattering as well as the vacuum-plasma transition region, which tend to destroy the injected bunch. In our simulations, the effect of the laser pulse dynamics is also taken into account. It is shown that injection at an angle can provide compressed and accelerated electron bunches with less than 2% energy spread. Another advantage of this scheme is that it has less stringent requirements in terms of the size of the injected bunch and there is the potential to trap more charge.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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