超相对论性等离子体尾流中的电离诱导电子俘获

Ionization-induced electron trapping in ultrarelativistic plasma wakes.

作者信息

Oz E, Deng S, Katsouleas T, Muggli P, Barnes C D, Blumenfeld I, Decker F J, Emma P, Hogan M J, Ischebeck R, Iverson R H, Kirby N, Krejcik P, O'Connell C, Siemann R H, Walz D, Auerbach D, Clayton C E, Huang C, Johnson D K, Joshi C, Lu W, Marsh K A, Mori W B, Zhou M

机构信息

Department of Electrophysics and Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.

出版信息

Phys Rev Lett. 2007 Feb 23;98(8):084801. doi: 10.1103/PhysRevLett.98.084801.

DOI:10.1103/PhysRevLett.98.084801

PMID:17359103

Abstract

The onset of trapping of electrons born inside a highly relativistic, 3D beam-driven plasma wake is investigated. Trapping occurs in the transition regions of a Li plasma confined by He gas. Li plasma electrons support the wake, and higher ionization potential He atoms are ionized as the beam is focused by Li ions and can be trapped. As the wake amplitude is increased, the onset of trapping is observed. Some electrons gain up to 7.6 GeV in a 30.5 cm plasma. The experimentally inferred trapping threshold is at a wake amplitude of 36 GV/m, in good agreement with an analytical model and PIC simulations.

摘要

研究了在高度相对论性的三维束流驱动等离子体尾波中产生的电子的俘获起始过程。俘获发生在由氦气限制的锂等离子体的过渡区域。锂等离子体电子支撑尾波，当束流被锂离子聚焦时，具有较高电离势的氦原子被电离并可能被俘获。随着尾波振幅的增加，可以观察到俘获的起始。在30.5厘米长的等离子体中，一些电子获得了高达7.6 GeV的能量。实验推断的俘获阈值为尾波振幅36 GV/m，与解析模型和粒子模拟结果吻合良好。