自注入对超强激光尾场加速的影响。
Effect of self-injection on ultraintense laser wake-field acceleration.
作者信息
Zhidkov A, Koga J, Kinoshita K, Uesaka M
机构信息
Nuclear Engineering Research Laboratory, Graduate School of Engineering, The University of Tokyo, 22-2 Shirane-shirakata, Tokai, Naka, Ibaraki 319-1188, Japan.
出版信息
Phys Rev E Stat Nonlin Soft Matter Phys. 2004 Mar;69(3 Pt 2):035401. doi: 10.1103/PhysRevE.69.035401. Epub 2004 Mar 31.
The self-injection of plasma electrons which have been accelerated to relativistic energies by a laser pulse moving with a group velocity less than the speed of light with I lambda(2)>5 x 10(19) W microm(2)/cm(2) is found via particle-in-cell simulation to be efficient for laser wake-field acceleration. When the matching condition a(0)> or =(2(1/4)omega/omega(pl))(2/3) is met, the self-injection, along with wave breaking, dominates monoenergetic electron acceleration yielding up to 100 MeV energies by a 100 TW, 20 fs laser pulse. In contrast to the injection due to wave-breaking processes, self-injection allows suppression of production of a Maxwell distribution of accelerated particles and the extraction of a beam-quality bunch of energetic electrons.
通过粒子模拟发现，对于激光尾场加速而言，由群速度小于光速的激光脉冲将等离子体电子加速到相对论能量后的自注入是有效的，条件为(I\lambda^{2}>5\times10^{19}) (W\ \mu m^{2}/cm^{2})。当满足匹配条件(a_{0}\geq(\frac{2^{\frac{1}{4}}\omega}{\omega_{pl}})^{\frac{2}{3}})时，自注入与波破裂一起主导单能电子加速，一个(100)太瓦、(20)飞秒的激光脉冲可产生高达(100)兆电子伏的能量。与波破裂过程引起的注入不同，自注入能够抑制加速粒子麦克斯韦分布的产生，并提取出具有良好束流品质的高能电子束。
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