Spectrally peaked electron beams produced via surface guiding and acceleration in femtosecond laser-solid interactions.
Spectrally peaked electron beams produced via surface guiding and acceleration in femtosecond laser-solid interactions.
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DOI：
10.1103/physreve.85.025401
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发表时间：
2012-02
期刊：
影响因子：
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通讯作者：
J. Mao;L. Chen;X. Ge;L. Zhang;W. Yan;D. Z. Li;G. Liao;J. Ma;K. Huang;Y. Li;X. Lu;Q. Dong;Z. Wei;Z. Sheng;J. Zhang
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文献类型：
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作者：
J. Mao;L. Chen;X. Ge;L. Zhang;W. Yan;D. Z. Li;G. Liao;J. Ma;K. Huang;Y. Li;X. Lu;Q. Dong;Z. Wei;Z. Sheng;J. Zhang
在相对论强度的飞秒激光脉冲辐照体靶后，观察到了沿着靶表面的高度准直MeV电子束导引。的光束质量被证明是关键取决于激光对比度：与纳秒的预脉冲，所产生的电子束是很好的集中和强烈的，而高的激光对比度产生发散的电子束。在大的预等离子体尺度长度的情况下，通过改变激光入射角，实现了对靶表面电子的可调谐引导和加速。通过将预等离子体尺度长度扩展到几百微米，我们获得了MeV谱峰的电子束，每个激光脉冲具有100 pC，发散角仅为3°。这种技术提出了一种将选举注入各种加速器设计的稳定方法。
Highly collimated MeV electron beam guiding has been observed along the target surface following the interaction of bulk target irradiation by femtosecond laser pulses at relativistic intensities. The beam quality is shown to depend critically on the laser contrast: With a ns prepulse, the generated electron beam is well concentrated and intense, while a high laser contrast produces divergent electron beams. In the case of large preplasma scale lengths, tunable guiding and acceleration of the target surface electrons is achieved by changing the laser incident angle. By expanding the preplasma scale length to several hundred micrometers, we obtained MeV spectrum-peaked electron beams with a 100 pC per laser pulse and divergence angles of only 3°. This technique suggests a stable method of injection of elections into a variety of accelerator designs.