Abstract
In this paper, we analytically investigated the optical gain in a free-electron laser (FEL) with a laser wiggler in the presence of a magnetized ion-channel. Electron trajectories, energy exchanges and optical gain of the FEL in the presence of magnetized ion-channel have been calculated. Laser wiggler due to its very short wiggler wavelength (in the micrometer range) provides both shorter output wavelength (in the X-ray range) and higher optical gain relative to the common magneto-static (helical or planar) wigglers. The results indicated that there are three groups of orbits (G.I.O, G.II.O, and G.III.O) in the presence of a magnetized ion-channel, whereas only two groups were found in the unmagnetized case. Further results revealed a strong laser gain due to the presence of G.II.O in the magnetized ion-channel, while this significant optical gain was not observed in the unmagnetized ion-channel. The most significant characteristic of our scheme is its output wavelength scalability by controlling the ion-channel and axial magnetic frequencies, as well as laser wiggler parameters.
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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All relevant data have been included in the paper.]
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Hajikarimi, F., Taherparvar, P. & Jafari, S. Optical gain in a free-electron laser with laser wiggler in the presence of a magnetized ion-channel. Eur. Phys. J. D 75, 305 (2021). https://doi.org/10.1140/epjd/s10053-021-00314-1
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DOI: https://doi.org/10.1140/epjd/s10053-021-00314-1