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26 September 2023 Bessel-Gaussian laser heater mode for microbunching instability suppression in free-electron lasers
Ravi Varma, Randy Lemons, Sergio Carbajo
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Proceedings Volume 12667, Laser Beam Shaping XXIII; 126670D (2023) https://doi.org/10.1117/12.2676222
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States
Abstract
Free-electron laser beam quality can be degraded due to microbunching instability (MBI) caused by collective quantum electrodynamic effects. A Laguerre-Gaussian mode laser profile has been shown to significantly reduce MBI compared to the standard Gaussian profile under ideal conditions. However, practical limitations of accelerators significantly hinder the Laguerre-Gaussian profile’s performance. We propose the use of a Bessel-Gaussian mode profile for laser heating. We model the interaction between the laser heater and e-beam with various spatial profiles and compare the Bessel-Gaussian with the Gaussian and Laguerre-Gaussian modes. We showcase the Bessel-Gaussian beam’s immunity to jitter and consistent suppression of MBI.
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Ravi Varma, Randy Lemons, and Sergio Carbajo "Bessel-Gaussian laser heater mode for microbunching instability suppression in free-electron lasers", Proc. SPIE 12667, Laser Beam Shaping XXIII, 126670D (26 September 2023); https://doi.org/10.1117/12.2676222
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KEYWORDS
Free electron lasers
Electron beams
Beam divergence
Pulsed laser operation
Quantum effects
Quantum electrodynamics
Quantum experiments
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