Abstract
In this paper we present results of numerical studies on the cavity desynchronization in the short-pulse waveguided free electron laser (FEL) oscillator FLARE, which is a new THz FEL at the Radboud University Nijmegen, with the emphasis to investigate the influence of the waveguide dispersion. In particular, the peaks of the detuning curves are predicted to be essentially broader. We also predict that the extent of the peak broadening increases as the waveguide dispersion becomes more significant.
Highlights
Free electron lasers (FELs) are powerful versatile light sources, in which the light is emitted by relativistic electrons propagating through a periodic magnetic field created by an undulator
At the long wavelengths, where the waveguide dispersion becomes pronounced, we conclude the following: (1) a larger cavity length reduction is required in order to achieve lasing; (2) the total range of the detuning values relative to the resonant wavelength where FLARE allows lasing decreases; (3) as predicted, the FEL efficiency diminishes due to the light diffraction; and (4) the peak of the detuning curve broadens and the maximum shifts towards larger jLj values
The latter implies a low FEL gain which results in very slow buildup of optical energy such that tens of s, a typical duration of rf linac macrobunches, are not sufficient to achieve saturation
Summary
Free electron lasers (FELs) are powerful versatile light sources, in which the light is emitted by relativistic electrons propagating through a periodic magnetic field created by an undulator. At large slippage parameters the electrons interact only with a part of the optical pulse and short-pulse effects become important One such effect in the FEL oscillators is ‘‘lethargy’’ [4,5]. It has recently been reported that selective amplification of the lower frequency branch is feasible for FELs employing electron bunches shorter than the corresponding light wavelength [8]. We numerically investigate cavity desynchronization in a short-pulse waveguided FEL Whereas this is well studied for the open resonator FELs [6,9,10,11,12,13,14,15,16,17], in this paper we describe how detuning curves are altered by the waveguide dispersion. In the paper we first briefly describe FLARE, the numerical model utilized to investigate the FLARE dynamics, and after that the simulation results are presented
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