Temporal compression of bunch train with picosecond spacing via THz-driven resonator

Y. Song; J. Wang; J. Yang; O. Meshkov; K. Fan

doi:10.1117/12.2620507

1 July 2022 Temporal compression of bunch train with picosecond spacing via THz-driven resonator

Y. Song, J. Wang, J. Yang, O. Meshkov, K. Fan

Proceedings Volume 12291, 1st International Conference on UltrafastX 2021; 1229106 (2022) https://doi.org/10.1117/12.2620507
Event: 1st International Conference on UltrafastX 2021, 2022, Xi'an, China

Abstract

Bunch trains consisting of ultrashort picosecond-spaced microbunches have potential applications in generating pulsed, tunable, narrow-band radiation sources in the THz region via coherent Smith-Purcell radiation (cSPr). However, the electrons in each microbunch experience longitudinal space-charge field, blurring the periodicity of the bunch train. There has been an increasing interest in manipulating each microbunch individually, and therefore significantly improving radiation intensity and bandwidth. The commonly used RF cavities (with nanosecond working period) cannot match the picosecond bunch spacing and, fail to compress each bunch individually. This paper proposes a novel method to simultaneously compress each microbunch in a picosecond-spaced bunch train using a THz-driven resonator with a customizable working frequency. A multi-pulse drives the THz-driven resonator to compensate for the field decay in the THz-driven resonator and preserve the well-defined periodicity of the bunch train. We demonstrate a resonating field with an amplitude fluctuation within±20%, which can be utilized to compress up to ten microbunches simultaneously.

Citation Download Citation

Y. Song, J. Wang, J. Yang, O. Meshkov, and K. Fan "Temporal compression of bunch train with picosecond spacing via THz-driven resonator", Proc. SPIE 12291, 1st International Conference on UltrafastX 2021, 1229106 (1 July 2022); https://doi.org/10.1117/12.2620507

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KEYWORDS

Resonators

Terahertz radiation

Electrons

Picosecond phenomena

Metals

Modulation

Pulsed laser operation

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