3D simulations on output power fluctuation in a short bunch rf-linac FEL

Sentoku, Y.; Furukawa, Hiroyuki; Mima, Kunioki; Taguchi, Toshihiro; Kuruma, S.; Yasuda, Hidenori; Yamanaka, Chiyoe; Nakai, S.

doi:10.1016/0168-9002(94)01332-2

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“…[15][16][17][18][19][20][21][22][23]). The coupling between these modes can lead to undesired effects, the most severe of those are spectral gaps, i.e., when at specific wavelengths lasing is impossible.…”

Section: Introductionmentioning

confidence: 99%

Multimode dynamics in a short-pulse THz free electron laser

Chulkov

Goryashko

Arslanov

et al. 2014

Phys. Rev. ST Accel. Beams

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The interaction of waveguide modes and consequences on laser operation are studied numerically in a THz free electron laser (FEL) driven by short electron bunches. The considered FEL cavity configuration is represented by a parallel-plate waveguide extending over the complete distance between cylindrical cavity mirrors with energy out-coupling through a rectangular slit in one of the mirrors. We describe the multimode FEL cavity desynchronization dynamics and predict strong enhancement in FEL power at special cavity configurations, when modes are degenerate. Furthermore, we predict that simultaneous excitation of several waveguide modes can occur but do not negatively influence the lasing process.

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