Coherent spontaneous radiation from highly bunched electron beams
Coherent spontaneous radiation from highly bunched electron beams
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DOI：
10.1016/0168-9002(96)00102-7
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发表时间：
1996-06-11
影响因子：
1.4
通讯作者：
Smith, TI
中科院分区：
文献类型：
--
作者：
Berryman, KW;Crosson, ER;Smith, TI
相干自发波荡器辐射现已在几个自由电子激光器中观察到，并且对于自放大自发发射（SASE）设备的设计来说是一个特别重要的主题。我们报告了斯坦福皮秒 FEL 中心对波长短至 5 微米的相干自发辐射的观测结果。当电子束在非峰值加速后被压缩时，在较长波长下观察到自发辐射比预测的不相干水平增强了 6 x 10(4) 倍。我们讨论了导致这些增强的可能结构，并使用跃迁辐射技术直接测量电子分布。
Coherent spontaneous undulator radiation has now been observed in several FELs, and is a subject of special importance to the design of self-amplified spontaneous emission (SASE) devices. We report observations of coherent spontaneous radiation at the Stanford Picosecond FEL Center at wavelengths as short as 5 microns. Enhancement of spontaneous radiation over predicted incoherent levels by as much as a factor of 6 x 10(4) has been observed at longer wavelengths when the electron bunches are compressed after off-peak acceleration. We discuss the possible structure responsible for these enhancements and present direct measurements of the electron distributions using transition radiation techniques.