Plasma accelerator driven coherent spontaneous emission

Alotaibi, B. M. and Altuijri, R. and Habib, A. F. and Hidding, B. and McNeil, B. W. J. and Traczykowski, P.; (2019) Plasma accelerator driven coherent spontaneous emission. In: Proceedings of the 39th International Free-Electron Laser Conference, FEL 2019. Proceedings of the 39th International Free-Electron Laser Conference, FEL 2019 . JACoW Publishing, DEU, pp. 157-160. ISBN 9783954502103 (https://doi.org/10.18429/JACoW-FEL2019-TUP05)

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Abstract

Plasma accelerators [1] are a potentially important source of high energy, low emittance electron beams with high peak currents and generated within a relatively short distance. While novel plasma photocathodes [2] may offer improvement to the normalised emittance and brightness of electron beams compared to Radio Frequency-driven accelerators, a challenge is the energy spread and chirp of the beams, which can make FEL operation impossible. In this paper it is shown that such an energy-chirped beam, with a dynamically evolving current profile due to ballistic bunching, can generate significant coherent radiation output via the process of Coherent Spontaneous Emission (CSE) [3]. While this CSE is seen to cause some FEL-induced electron bunching at the radiation wavelength, the dynamic evolution of the energy chirped pulse dampens out any high-gain FEL interaction.

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