Clean beams from laser wake-field accelerators via optical injection with a cleanup pulse

被引:16
作者
Cary, JR
Giacone, RE
Nieter, C
Bruhwiler, DL
机构
[1] Tech X Corp, Boulder, CO 80303 USA
[2] Univ Colorado, Ctr Integrated Plasma Studies, Boulder, CO 80309 USA
关键词
D O I
10.1063/1.1871196
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Multiple colliding-pulse injection schemes have been proposed as means for trapping electrons in the ultrashort acceleration buckets of laser-generated wake fields. The primary goal of this paper is to present a parameter study to determine the beams that can be obtained through collisions of collinear laser pulses in uniform plasma. The parameter study is through fully self-consistent, two-dimensional, particle-in-cell simulations, as previous work used only test-particle computations. To remove the multiple beams that can commonly be generated in colliding pulse injection, we use a cleanup pulse, a trailing laser pulse that absorbs the wake. The wake then no longer exists in the region where the trailing beamlets would be, and so the trailing beamlets no longer form. A series of simulations predicts that with such one can obtain single, short (<= 10 fs) beams with a bunch charge of order 10 pC, normalized emittance of order 2 pi mu m, and energy spread of the order of 10%. The parameters of the beams are insensitive to the amplitude of the backward pulse above normalized amplitudes of a(bw)approximate to 0.4. (c) 2005 American Institute of Physics.
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页数:7
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