Self-Guided Laser Wakefield Acceleration beyond 1 GeV Using Ionization-Induced Injection
Self-Guided Laser Wakefield Acceleration beyond 1 GeV Using Ionization-Induced Injection
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DOI：
10.1103/physrevlett.105.105003
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发表时间：
2010-09-01
影响因子：
8.6
通讯作者：
Froula, D. H.
中科院分区：
文献类型：
--
作者：
Clayton, C. E.;Ralph, J. E.;Froula, D. H.
在激光韦克菲尔德加速器中，将匹配光束、激光自导引传输和电离诱导注入的概念结合起来，将电子加速到1.45 GeV能量。从激光离开等离子体的空间和光谱内容，我们推断，60 fs，110 TW的激光脉冲被引导，并激发了密度低于1.5 × 10（18）cm（-3）的气室的整个1.3 cm长的尾流。只有当少量（3%）的CO2气体被添加到He气体中时，才能观察到高能电子。计算机模拟证实，正是氧的K壳层电子被电离并注入尾流，并加速到超过1 GeV的能量。
The concepts of matched-beam, self-guided laser propagation and ionization-induced injection have been combined to accelerate electrons up to 1.45 GeV energy in a laser wakefield accelerator. From the spatial and spectral content of the laser light exiting the plasma, we infer that the 60 fs, 110 TW laser pulse is guided and excites a wake over the entire 1.3 cm length of the gas cell at densities below 1.5 x 10(18) cm(-3). High-energy electrons are observed only when small (3%) amounts of CO2 gas are added to the He gas. Computer simulations confirm that it is the K-shell electrons of oxygen that are ionized and injected into the wake and accelerated to beyond 1 GeV energy.