Electron-yield enhancement in a laser-wakefield accelerator driven by asymmetric laser pulses

被引：175
|
作者：
Leemans, WP [1 ]
Catravas, P
Esarey, E
Geddes, CGR
Toth, C
Trines, R
Schroeder, CB
Shadwick, BA
van Tilborg, J
Faure, J
机构：
[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA
[2] Tech Univ Eindhoven, NL-5600 MB Eindhoven, Netherlands
来源：
PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 17期
关键词：
D O I：
10.1103/PhysRevLett.89.174802
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The effect of asymmetric laser pulses on electron yield from a laser wakefield accelerator has been experimentally studied using >10(19) cm(-3) plasmas and a 10 TW, >45 fs, Ti:Al2O3 laser. The laser pulse shape was controlled through nonlinear chirp with a grating pair compressor. Pulses (76 fs FWHM) with a steep rise and positive chirp were found to significantly enhance the electron yield compared to pulses with a gentle rise and negative chirp. Theory and simulation show that fast rising pulses can generate larger amplitude wakes that seed the growth of the self-modulation instability, and that frequency chirp is of minimal importance for the experimental parameters.
引用
收藏
页码：174802/1 / 174802/4
页数：4
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