在ASTA上用3-MHz速率电子束研究Laser诱导的微聚束的潜力
Potential For Laser-Induced Microbunching Studies with the 3-MHZ-Rate Electron Beams at ASTA
摘要：
激光诱导的微聚束的调查，因为它涉及到时间切片的电子束诊断和高增益谐波产生（HGHG）自由电子激光使用明亮的电子束提出的ASTA设施。初始测试在40-50 MeV与放大的800-nm种子激光束共同传播的电子束通过短波荡器（或调制器）调谐的共振条件，然后通过随后的弯道传输将导致能量调制和z-密度调制（微聚束），分别。后一种微聚束将导致在金属转换器屏幕处产生相干光学或UV跃迁辐射（COTR、CUVTR），这可以揭示切片光束尺寸、质心和能量扩散。此外，通过测量COTR强度和弯道后谐波含量作为种子激光功率和光束参数的函数，将直接评估与HGHG相关的微聚束因素。这些实验将使用ASTA 3-MHz速率微脉冲训练进行，最长可达1 ms，这是美国测试设施所独有的。
英文摘要：
Investigations of the laser-induced microbunching as it is related to time-sliced electron-beam diagnostics and high-gain-harmonic generation (HGHG) free-electron lasers using bright electron beams are proposed for the ASTA facility. Initial tests at 40-50 MeV with an amplified 800-nm seed laser beam co-propagating with the electron beam through a short undulator (or modulator) tuned for the resonance condition followed by transport through a subsequent chicane will result in energy modulation and z-density modulation (microbunching), respectively. The latter microbunching will result in generation of coherent optical or UV transition radiation (COTR, CUVTR) at a metal converter screen which can reveal slice beam size, centroid, and energy spread. Additionally, direct assessment of the microbunching factors related to HGHG by measurement of the COTR intensity and harmonic content after the chicane as a function of seed laser power and beam parameters will be done. These experiments will be performed using the ASTA 3-MHz-rate micropulse train for up to 1ms which is unique to test facilities in the USA.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
