Towards higher frequencies in a compact prebunched waveguide THz-FEL

Andrew Fisher, Maximilian Lenz, Alex Ody, Yining Yang, Chad Pennington, Jared Maxson, Tara Hodgetts, Ronald Agustsson, Alex Murokh and Pietro Musumeci ()
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Andrew Fisher: UCLA
Maximilian Lenz: UCLA
Alex Ody: UCLA
Yining Yang: UCLA
Chad Pennington: Cornell University
Jared Maxson: Cornell University
Tara Hodgetts: RadiaBeam Technologies
Ronald Agustsson: RadiaBeam Technologies
Alex Murokh: RadiaBeam Technologies
Pietro Musumeci: UCLA

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Free-electron-lasers fill a critical gap in the space of THz-sources as they can reach high average and peak powers with spectral tunability. Using a waveguide in a THz FEL significantly increases the coupling between the relativistic electrons and electromagnetic field enabling large amounts of radiation to be generated in a single passage of electrons through the undulator. In addition to transversely confining the radiation, the dispersive properties of the waveguide critically affect the velocity and slippage of the radiation pulse which determine the central frequency and bandwidth of the generated radiation. In this paper, we characterize the spectral properties of a compact waveguide THz FEL including simultaneous lasing at two different frequencies and demonstrating tuning of the radiation wavelength in the high frequency branch by varying the beam energy and ensuring that the electrons injected into the undulator are prebunched on the scale of the resonant radiation wavelength.

Date: 2024
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DOI: 10.1038/s41467-024-51892-8

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