| 双束等离子体尾波加速中的束流相对能散预测 |
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| 引用本文： | 王晓宁,高杰,安维明,王佳,李大章,曾明,鲁巍.双束等离子体尾波加速中的束流相对能散预测[J].强激光与粒子束,2022,34(4):049002-1-049002-5. |
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| 作者姓名： | 王晓宁 高杰 安维明 王佳 李大章 曾明 鲁巍 |
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| 作者单位： | 1.中国科学院 高能物理研究所, 北京 100049 |
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| 基金项目： | 国家自然科学基金项目(12075030, 11975252); 中国科学院前沿科学重点研究计划项目(QYZDJ-SSW-SLH004)；中国科学院人才引进计划(E05153U1); 中国科学院高能物理研究所创新基金项目(Y954516) |
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| 摘 要： | 针对空泡机制中的双束等离子体尾波电子加速设计，给出了能够快速得到被加速束流在最大加速距离下的相对能散的预测公式。通过加速初始时刻束流纵向分布以及束流所处位置的纵向尾波场可得到束流最终相对能散。该预测公式不仅可应用于驱动束流与被加速束流初始能量相同的情况，还可应用于两个束流初始能量不相同的情况。由该预测公式得到的束流相对能散与被加速束流和驱动束流的初始能量的比值有关，而与两个束流初始能量的数值无关。利用准静态近似的粒子网格模拟程序QuickPIC对理论进行了模拟验证，模拟结果与理论预期结果一致。
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| 关 键 词： | 等离子体尾波加速 电子加速 双束团 相对能散 粒子网格模拟 |
| 收稿时间： | 2021-10-10 |
Predicting relative energy spread in two-bunch plasma wakefield acceleration |
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| Affiliation: | 1.Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China2.University of Chinese Academy of Sciences, Beijing 100049, China3.Department of Astronomy, Beijing Normal University, Beijing 100875, China4.Department of Engineering Physics, Tsinghua University, Beijing 100084, China |
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| Abstract: | We present a formula to directly obtain the final relative energy spread of a trailing beam at the maximal acceleration distance. The formula works for electron beams in a two-bunch plasma wakefield acceleration stage in the so-called nonlinear bubble regime. It only requires the longitudinal profile of the trailing beam and the longitudinal wakefield within the trailing beam at the beginning of an acceleration. This formula not only works well for drive beams and trailing beams with the same initial energies, but is also available for those beams with different initial energies. We find that the relative energy spread of the trailing beam obtained from the formula is determined by the ratio of the trailing beam’s initial energy to the drive beam’s initial energy rather than the specific value of their initial energies. We perform several computational simulations using the quasi-static particle-in-cell code QuickPIC, and the results agree well with that calculated from the formula. |
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