One-dimensional theory of harmonically seeded free-electron laser
We revisit free-electron laser (FEL) equations in the presence of a planar undulator to investigate effects on longitudinal FEL dynamics upon seeding by a harmonic. For this study, we adopt slowly varying phase approximation, collective variables, and Klimontovich description of particle beams to ex...
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| Format: | Article |
| Language: | English |
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American Physical Society
2023-06-01
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| Series: | Physical Review Accelerators and Beams |
| Online Access: | http://doi.org/10.1103/PhysRevAccelBeams.26.060701 |
| Summary: | We revisit free-electron laser (FEL) equations in the presence of a planar undulator to investigate effects on longitudinal FEL dynamics upon seeding by a harmonic. For this study, we adopt slowly varying phase approximation, collective variables, and Klimontovich description of particle beams to explore the effects of harmonic seeding on low-gain saturation, low-gain amplification, and exponential growth for on-axis radiation emission. We also investigate the effects of frequency detuning and nonzero energy spread on power gain and growth rate for low-gain and high-gain FELs, respectively. |
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| ISSN: | 2469-9888 |