Department of Electrical Engineering, University of California, Los Angeles, California 90095, USA.
Phys Rev Lett. 2010 Sep 3;105(10):105003. doi: 10.1103/PhysRevLett.105.105003. Epub 2010 Sep 1.
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 × 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.
已将匹配束、自导激光传播和电离诱导注入的概念结合起来，以在激光尾流加速器中将电子加速到 1.45GeV 的能量。从离开等离子体的激光光的空间和光谱内容，我们推断出 60fs、110TW 的激光脉冲被引导并在低于 1.5×10(18)cm(-3)的密度下激发整个 1.3cm 长的气体室的尾流。只有当向氦气中添加少量（3%）的二氧化碳气体时，才会观察到高能电子。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 1GeV 以上的能量。
