High-brightness photo-injector with standing-wave buncher-based ballistic bunching scheme for inverse Compton scattering light source
High-brightness photo-injector with standing-wave buncher-based ballistic bunching scheme for inverse Compton scattering light source
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DOI：
10.1007/s41365-022-01025-x
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发表时间：
2022-04
影响因子：
2.8
通讯作者：
Jianxin Wang;K. Zhou;Peng Li;D. Xiao;L. Shan;Xuming Shen;Yu Liu;Zheng Zhou;Hanlin Wang
中科院分区：
文献类型：
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作者：
Jianxin Wang;K. Zhou;Peng Li;D. Xiao;L. Shan;Xuming Shen;Yu Liu;Zheng Zhou;Hanlin Wang
我们报告了我们最近在设计和模拟一个高亮度的S波段光注入器的弹道聚束计划，旨在驱动逆康普顿散射（ICS）X射线源。通过在传统的S波段光注入器中的RF枪和第一增强器之间添加短驻波聚束器，具有500 pC电荷的电子聚束可以在非常有限的输入RF功率和光注入器的基本布局不变的情况下被压缩到亚皮秒水平。束流动力学分析表明，微调的聚焦强度的枪和直线加速器螺线管可以很好地平衡额外的聚焦提供的驻波聚束器，并产生一个很好的补偿横向发射度。对不同工作条件下聚束动力学的模拟表明，具有较多单元和适度梯度的聚束器适合于同时获得短的聚束持续时间和低的发射度。在具有38 MV/m梯度的9单元聚束器的典型情况下，对于500 pC的电子脉冲，可以容易地获得0.5ps的超短聚束持续时间（对应于的压缩比）和的低发射度。这种可行的弹道聚束方案将有助于在大多数现有的S波段光注入器上实现超短脉冲模式逆康普顿散射X射线源。
We report our recent progress in the design and simulation of a high-brightness S-band photo-injector with a ballistic bunching scheme aimed at driving an inverse Compton scattering (ICS) X-ray source. By adding a short standing-wave buncher between the RF gun and first booster in a conventional S-band photo-injector, electron bunches with a 500 pC charge can be compressed to the sub-picosecond level with very limited input RF power and an unchanged basic layout of the photo-injector. Beam dynamics analysis indicates that fine tuning of the focusing strength of the gun and linac solenoid can well balance additional focusing provided by the standing wave buncher and generate a well-compensated transverse emittance. Thorough bunching dynamics simulations with different operating conditions of the buncher show that a buncher with more cells and a moderate gradient is suitable for simultaneously obtaining a short bunch duration and low emittance. In a typical case of a 9-cell buncher with a 38 MV/m gradient, an ultrashort bunch duration of 0.5 ps (corresponding to a compression ratio of) and a low emittance ofcan be readily obtained for a 500 pC electron pulse. This feasible ballistic bunching scheme will facilitate the implementation of an ultrashort pulse mode inverse Compton scattering X-ray source on most existing S-band photo-injectors.