Abstract
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.
Highlights
Short intense pulses of coherent synchrotron radiation (CSR) in the terahertz (THz) frequency range are generated at synchrotron radiation facilities when electron bunches are compressed to picosecond time scales
The high degree of spatial compression in this so-called low-αc 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 microbunching instability (“bursting”)
This paper introduces the method and presents first results obtained at the ANKA synchrotron radiation facility
Summary
Short intense pulses of coherent synchrotron radiation (CSR) in the terahertz (THz) frequency range are generated at synchrotron radiation facilities when electron bunches are compressed to picosecond time scales In this operation mode the high degree of spatial compression of the optics with reduced momentum compaction factor (“low-αc optics”) entails complex longitudinal dynamics of the electron bunches, leading to the so-called microbunching instability. This article presents a novel “quasi-instantaneous” approach to study the bursting threshold, based on highrate sampling over many turns of the radiation emitted from all electron bunches circulating in the ANKA storage ring These so-called “snapshot measurements” drastically reduce the time necessary for mapping the bursting behavior and the bursting threshold at different machine settings. The measured bursting thresholds at these different configurations are compared to the bunched-beam theory [9], which is briefly outlined below
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