直流和超导射频组合光电阴极枪的高性能运行

arXiv - PHYS - Accelerator Physics Pub Date : 2024-06-02 DOI:arxiv-2406.00659

H. Jia, T. Li, T. Wang, Y. Zhao, X. Zhang, H. Xu, Z. Liu, J. Liu, L. Lin, H. Xie, L. Feng, F. Wang, F. Zhu, J. Hao, S. Quan, K. Liu, S. Huang

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引用次数: 0

摘要

超导射频（SRF）枪有望为新一代相干直列加速器光源、超快电子衍射、MeV 脉冲束等应用提供高亮度连续波（CW）电子束。为了解决半导体非晶阴极的兼容性问题，我们开发了一种结合了直流间隙和 SRF 腔的混合枪。该枪采用 K2CsSb 光阴极，由绿色激光器驱动，已进入稳定的 CW 工作状态，暗电流低于 100 pA，可输出能量增益为 2.4 MeV 的电子束，电子束电荷为 100 pC，重复频率为 1 MHz。电子束电荷为 100 pC、峰值电流约为 6 A 时，归一化电子束幅射为 0.54 mm-mrad。还测试了 81.25 MHz 重复频率下的连续波操作，最大平均光束电流达到 3 mA。

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High Performance Operation of a Direct-Current and Superconducting Radio-Frequency Combined Photocathode Gun

Superconducting radio-frequency (SRF) guns are promising candidates to deliver high brightness continuous-wave (CW) electron beams for new generations of coherent linac light sources, ultrafast electron diffractions, MeV pulsed beam applications, etc. To solve the compatibility problem of semiconductor photocathodes, a hybrid gun combining a direct-current gap and an SRF cavity has been developed. The gun, employing K2CsSb photocathodes driven by a green laser, has been brought into stable CW operation with a dark current below 100 pA, delivering electron beams at an energy gain of 2.4 MeV, an electron bunch charge of 100 pC, and a repetition rate of 1 MHz. A normalized beam emittance of 0.54 mm-mrad has been achieved at the bunch charge of 100 pC and peak current of about 6 A. CW operation at 81.25 MHz repetition rate has also been tested with the maximum average beam current reaching 3 mA.

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arXiv - PHYS - Accelerator Physics

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