Injection and Trapping of Tunnel-Ionized Electrons into Laser-Produced Wakes
Injection and Trapping of Tunnel-Ionized Electrons into Laser-Produced Wakes
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DOI：
10.1103/physrevlett.104.025003
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发表时间：
2010-01-15
影响因子：
8.6
通讯作者：
Joshi, C.
中科院分区：
文献类型：
--
作者：
Pak, A.;Marsh, K. A.;Joshi, C.
提出了一种利用痕量原子连续电离态之间的巨大电离能差向激光驱动尾流场注入电子的方法。这里使用了氦气和微量氮气的混合物。来自氮K壳层的电子在激光脉冲峰值附近被隧道电离，并被大多数氦原子和氮L壳层的电子产生的尾流注入和捕获。加速电子的谱、捕获阈值强度、前向传输激光谱和光束散度均与该注入过程一致。实验测量结果得到了理论和三维OSIRIS模拟的支持。
A method, which utilizes the large difference in ionization potentials between successive ionization states of trace atoms, for injecting electrons into a laser-driven wakefield is presented. Here a mixture of helium and trace amounts of nitrogen gas was used. Electrons from the K shell of nitrogen were tunnel ionized near the peak of the laser pulse and were injected into and trapped by the wake created by electrons from majority helium atoms and the L shell of nitrogen. The spectrum of the accelerated electrons, the threshold intensity at which trapping occurs, the forward transmitted laser spectrum, and the beam divergence are all consistent with this injection process. The experimental measurements are supported by theory and 3D OSIRIS simulations.