同步辐射光源太赫兹脉冲群及其特性的快速测绘
Fast Mapping of Terahertz Bursting Thresholds and Characteristics at Synchrotron Light Sources
摘要：
具有极短电子束团的专用光学器件使同步加速器光源能够产生强烈的相干THz辐射。这种所谓的低α光学器件中的高度空间压缩需要电子聚束的复杂纵向动力学，这可以通过研究由微聚束不稳定性（“爆发”）引起的发射太赫兹辐射的波动来探测。本文提出了一种“准瞬时”的方法来测量的爆裂特性，同时收集和评估的信息，从所有束团在一个多束填充，减少测量时间从几个小时到几秒钟。这种加速允许在机器的单次填充内对各种加速器设置的爆裂特性进行系统研究，从而能够将测量的爆裂阈值与聚束理论的理论预测进行全面比较。本文介绍了这种方法，并给出了在ANKA同步辐射装置上获得的第一批结果。
英文摘要：
Dedicated optics with extremely short electron bunches enable synchrotron light sources to generate intense coherent THz radiation. The high degree of spatial compression in this so-called low-alpha optics entails a complex longitudinal dynamics of the electron bunches, which can be probed studying the fluctuations in the emitted terahertz radiation caused by the micro-bunching instability ("bursting"). This article presents a "quasi-instantaneous" method for measuring the bursting characteristics by simultaneously collecting and evaluating the information from all bunches in a multi-bunch fill, reducing the measurement time from hours to seconds. This speed-up allows systematic studies of the bursting characteristics for various accelerator settings within a single fill of the machine, enabling a comprehensive comparison of the measured bursting thresholds with theoretical predictions by the bunched-beam theory. This paper introduces the method and presents first results obtained at the ANKA synchrotron radiation facility.
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