Commissioning test of S-band klystron/photo-gun system for femto-second sub-MeV electron beam R&D

2016 IEEE International Vacuum Electronics Conference (IVEC) Pub Date : 2016-04-01 DOI:10.1109/IVEC.2016.7561786

A. Green, H. Panuganti, M. Figora, Y. Shin

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Abstract

A timely stable femto-second electron beam system is being constructed for pump-probe time-resolved experiments and applications. A pulsed S-band klystron is installed and fully commissioned with 5.5 MW peak power in a 2.5 μs pulse length and 1 Hz repetition rate. A single-cell RF photo-gun is designed to produce with 0.16 - 1.6 pC electron bunches in a photo-emission mode within a 600 fs ∓ 3 ps at 0.5 - 1 MeV. The measured RF system jitters are within ± 1 % in magnitude and ± 0.2° in phase, which would induce 3.4 keV and 0.25 keV of ΔEg, corresponding to 80 fs and 5 fs of Δte, respectively. The beam brightness could be improved by replacing a conventional photo-cathode with field emission array or carbon nanotube tips as they limit the emission area, while providing high current emission. PIC simulations indicate that our designed bunch compressor reduces the TOA-jitter by about an order of magnitude. The transport and focusing optics of the designed beamline with the bunch compressor enables an energy spread within 10-4 and a bunch length (electron probe) within > 50 - 100 fs.

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飞秒亚兆电子伏电子束研发s波段速调管/光电枪系统调试试验

为泵浦探针时间分辨实验和应用，构建了一个及时稳定的飞秒电子束系统。安装了脉冲s波段速调管，在2.5 μs脉冲长度和1hz重复频率下，峰值功率为5.5 MW。设计了一种单细胞RF光枪，可在600 fs / 3 ps的光发射模式下，在0.5 - 1 MeV下产生0.16 - 1.6 pC电子束。测量到的射频系统抖动幅度在±1%以内，相位在±0.2°以内，分别诱发ΔEg的3.4 keV和0.25 keV，对应于Δte的80 fs和5 fs。用场发射阵列或碳纳米管尖端取代传统的光电阴极可以提高光束的亮度，因为它们限制了发射区域，同时提供了高电流发射。PIC仿真表明，我们设计的束压缩器将toa抖动降低了约一个数量级。设计的束线的传输和聚焦光学与束压缩器使能量扩散在10-4以内，束长(电子探针)在> 50 - 100 fs。

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2016 IEEE International Vacuum Electronics Conference (IVEC)

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