Microbunching instability in relativistic electron bunches: direct observations of the microstructures using ultrafast YBCO detectors.
Microbunching instability in relativistic electron bunches: direct observations of the microstructures using ultrafast YBCO detectors.
复制标题
相对论电子束中的微聚束不稳定性：使用超快 YBCO 探测器直接观察微观结构
DOI：
10.1103/physrevlett.113.094801
复制
发表时间：
2014
影响因子：
8.6
通讯作者：
M. Katoh
中科院分区：
文献类型：
--
作者：
E. Roussel;C. Evain;C. Szwaj;S. Bielawski;J. Raasch;P. Thoma;A. Scheuring;M. Hofherr;K. Ilin;S. Wünsch;M. Siegel;M. Hosaka;N. Yamamoto;Y. Takashima;H. Zen;T. Konomi;M. Adachi;S. Kimura;M. Katoh
在加速器中循环的相对论电子束团受到动力学不稳定性的影响，导致毫米到厘米尺度的微结构。虽然这是一个众所周知的事实，但对这些结构或它们发射的场的直接实验观察，到目前为止仍然是一个悬而未决的问题。在这里，我们报告的直接，一枪一枪，时间分辨记录的形状（包括包络线和载波）的相干同步辐射的脉冲发出的，这是一个“签名”的电子束微观结构。实验在UVSOR-III储存环上进行，使用电场敏感的薄膜超快探测器。所观察到的图案受到永久漂移，这可以从相空间中的推理，使用宏粒子模拟来解释。
Relativistic electron bunches circulating in accelerators are subjected to a dynamical instability leading to microstructures at millimeter to centimeter scale. Although this is a well-known fact, direct experimental observations of the structures, or the field that they emit, remained up to now an open problem. Here, we report the direct, shot-by-shot, time-resolved recording of the shapes (including envelope and carrier) of the pulses of coherent synchrotron radiation that are emitted, and that are a “signature” of the electron bunch microstructure. The experiments are performed on the UVSOR-III storage ring, using electrical field sensitivethin-film ultrafast detectors. The observed patterns are subjected to permanent drifts, that can be explained from a reasoning in phase space, using macroparticle simulations.