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.

A waveguide can increase the coupling between an electron beam and electromagnetic field in a THz Free Electron Laser. The authors characterize the spectral properties of a compact waveguide FEL including dual-frequency lasing and tunable wavelength.

Details

Title
Towards higher frequencies in a compact prebunched waveguide THz-FEL
Author
Fisher, Andrew 1   VIAFID ORCID Logo  ; Lenz, Maximilian 1 ; Ody, Alex 1 ; Yang, Yining 1   VIAFID ORCID Logo  ; Pennington, Chad 2 ; Maxson, Jared 2 ; Hodgetts, Tara 3 ; Agustsson, Ronald 3   VIAFID ORCID Logo  ; Murokh, Alex 3 ; Musumeci, Pietro 1   VIAFID ORCID Logo 

 UCLA, Department of Physics and Astronomy, Los Angeles, USA (GRID:grid.19006.3e) (ISNI:0000 0000 9632 6718) 
 Cornell University, Department of Physics, Ithaca, USA (GRID:grid.5386.8) (ISNI:0000 0004 1936 877X) 
 RadiaBeam Technologies, Santa Monica, USA (GRID:grid.456061.0) 
Pages
7582
Publication year
2024
Publication date
2024
Publisher
Nature Publishing Group
e-ISSN
20411723
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3099205444
Copyright
© The Author(s) 2024. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.