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Effect of laser contrast ratio on electron beam stability in laser wakefield acceleration experiments

机译：激光尾流加速实验中激光对比度对电子束稳定性的影响

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摘要

Laser wakefield accelerators offer the possibility of compact electron acceleration. However one of the key outstanding issues with the results reported to date is the electron beam stability. Experiments on two laser systems reveal that the contrast ratio between the ASE pedestal and main pulse is an important factor in determining the quality of the electron beam. With a high contrast ratio (108) the electron beam profile is a well collimated single beam having a low pointing instability (< 10 mrad rms). With a lower contrast (10(6)) the beam profile contains multiple beamlets which exhibit a large pointing instability (similar or equal to 50 mrad rms). A high contrast ratio not only improves the beam pointing stability (similar or equal to 6 mrad) but also stabilizes the electron beam energy reproducibility (5%).
机译：激光尾场加速器提供了紧凑的电子加速的可能性。然而，迄今为止报道的结果的关键突出问题之一是电子束稳定性。在两个激光系统上进行的实验表明，ASE基座和主脉冲之间的对比度是决定电子束质量的重要因素。在高对比度（108）的情况下，电子束轮廓是具有低指向稳定性（＜10mrad rms）的良好准直的单束。在较低的对比度（10（6））下，光束轮廓包含多个表现出较大的指向不稳定性（近似或等于50 mrad rms）的子束。高对比度不仅可以提高电子束指向稳定性（近似或等于6 mrad），而且可以使电子束能量再现性（5％）稳定。

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