Energy scaling of quasi-monoenergetic electron beams from laser wakefields driven by 40-TW ultra-short pulses
Energy scaling of quasi-monoenergetic electron beams from laser wakefields driven by 40-TW ultra-short pulses
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DOI：
10.1007/s00340-007-2802-8
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发表时间：
2007-10
期刊：
影响因子：
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通讯作者：
A. Maksimchuk;S. Reed;N. Naumova;V. Chvykov;B. Hou;G. Kalintchenko;T. Matsuoka;J. Nees;P. Rousseau;G. Mourou;V. Yanovsky
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文献类型：
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作者：
A. Maksimchuk;S. Reed;N. Naumova;V. Chvykov;B. Hou;G. Kalintchenko;T. Matsuoka;J. Nees;P. Rousseau;G. Mourou;V. Yanovsky
将峰值强度为10 ~（19）W/cm ~ 2的40 TW、30 fs激光脉冲聚焦到超声速He气体射流上，产生了等离子体密度在1.5× 10 ~（19）cm ~（-3）≤ne≤3.5× 10 ~（19）cm ~（-3）范围内的准单能电子束。我们发现，能量，电荷，发散角和指向稳定性的光束可以通过改变ne控制，并产生更高的电子能量和更稳定的光束较低的密度。从物理上解释了所观察到的变化之间的相互作用泵耗尽和退相之间的加速电子和等离子体波。二维粒子模拟支持的解释，显示了激光脉冲在等离子体中的演化和电子注入和加速的细节。在等离子体密度为1.5× 10 ~（19）cm ~（-3）时，获得了能量超过300 MeV、发散角大于10 mrad的准单能束流。
By focusing 40-TW, 30-fs laser pulses to the peak intensity of 1019W/cm2onto a supersonic He gas jet, we generate quasi-monoenergetic electron beams for plasma density in the specific range 1.5×1019cm-3≤ne≤3.5×1019cm-3. We show that the energy, charge, divergence and pointing stability of the beam can be controlled by changing ne, and that higher electron energies and more stable beams are produced for lower densities. The observed variations are explained physically by the interplay among pump depletion and dephasing between accelerated electrons and plasma wave. Two-dimensional particle-in-cell simulations support the explanation by showing the evolution of the laser pulse in plasma and the specifics of electron injection and acceleration. An optimized quasi-monoenergetic beam of over 300 MeV and 10 mrad angular divergence is demonstrated at a plasma density of ne≃1.5×1019cm-3.