Electron beam manipulation, injection and acceleration in plasma wakefield accelerators by optically generated plasma density spikes
Electron beam manipulation, injection and acceleration in plasma wakefield accelerators by optically generated plasma density spikes
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DOI：
10.1016/j.nima.2016.02.027
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发表时间：
2016-09
影响因子：
1.4
通讯作者：
G. Wittig;O. Karger;A. Knetsch;Y. Xi;A. Deng;J. Rosenzweig;D. Bruhwiler;Jonathan M. Smith;Z. Sheng;D. Jaroszynski;G. Manahan;B. Hidding
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文献类型：
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作者：
G. Wittig;O. Karger;A. Knetsch;Y. Xi;A. Deng;J. Rosenzweig;D. Bruhwiler;Jonathan M. Smith;Z. Sheng;D. Jaroszynski;G. Manahan;B. Hidding
我们讨论了有关等离子体尾场加速器中光触发电子束生成的新颖且稳健的方案的考虑因素[1]。在这项技术中，横向传播的聚焦激光脉冲在等离子体尾迹到达之前点燃准静止等离子体柱。这种局部等离子体密度增强或光学“等离子体炬”会在电子驱动束到达期间扭曲喷出并改变电子轨迹，从而实现受控注入。通过改变气体密度和激光脉冲参数（例如束腰和强度），并通过移动激光脉冲的焦点，可以轻松调整等离子炬的形状以及生成的拖尾光束。与基于流体动力学的方法相比，所提出的方法在产生气体密度转变方面更加灵活和更快，并且它满足实验人员的需求，因为它是纯粹的光学过程并且易于实施。
We discuss considerations regarding a novel and robust scheme for optically triggered electron bunch generation in plasma wakefield accelerators [1]. In this technique, a transversely propagating focused laser pulse ignites a quasi-stationary plasma column before the arrival of the plasma wake. This localized plasma density enhancement or optical “plasma torch” distorts the blowout during the arrival of the electron drive bunch and modifies the electron trajectories, resulting in controlled injection. By changing the gas density, and the laser pulse parameters such as beam waist and intensity, and by moving the focal point of the laser pulse, the shape of the plasma torch, and therefore the generated trailing beam, can be tuned easily. The proposed method is much more flexible and faster in generating gas density transitions when compared to hydrodynamics-based methods, and it accommodates experimentalists needs as it is a purely optical process and straightforward to implement.