论文标题
高重复利率超快电子束产生的场增强传导冷却超导腔
A Field-Enhanced Conduction-Cooled Superconducting Cavity for High-Repetition-Rate Ultrafast Electron Bunch Generation
论文作者
论文摘要
明亮电子束的高重复利率来源具有广泛的应用。它们可以直接用作电子碎片设置中的探针，也可以用作在广泛的电磁频谱上产生辐射的骨架。本文介绍了一个紧凑的亚电动机 - 电子（sub-mev）电子源设置的发展，能够以MHz重复速率运行，并形成横向发射率低于20〜nm的子皮秒电子束。该设置依赖于传导冷却的超导单细胞谐振器的几何形状改变以增强发射极表面的场。该系统旨在使用$ 2 $ 〜W的型号在4.2 K脉冲管无冷冻的冷冻机器上容纳冷却。尽管我们专注于光电电子束的情况，但该方案可以适应其他排放机制。
High-repetition-rate sources of bright electron bunches have a wide range of applications. They can directly be employed as probes in electron-scattering setups, or serve as a backbone for the generation of radiation over a broad range of the electromagnetic spectrum. This paper describes the development of a compact sub-Mega-electronvolt (sub-MeV) electron-source setup capable of operating at MHz repetition rates and forming sub-picosecond electron bunches with transverse emittance below 20~nm. The setup relies on a conduction-cooled superconducting single-cell resonator with its geometry altered to enhance the field at the surface of the emitter. The system is designed to accommodate cooling using a model a $2$~W at 4.2 K pulse tube cryogen-free cryocooler. Although we focus on the case of a photoemitted electron bunch, the scheme could be adapted to other emission mechanisms.
