Free-electron laser beam quality
Abstract
Free-electron laser beam quality is defined as the ratio of the current density to the relative axial energy spread. The approach to obtaining high-quality electron beams in some representative accelerators is examined and compared to the beam brightness. Beam quality is found to be a decreasing function of beam current, unless axial current compression (i.e., subharmonic bunching) or high current density cathodes are used. Effects due to magnetic perturbations are enhanced at high beam density.
- Publication:
-
IEEE Journal of Quantum Electronics
- Pub Date:
- July 1985
- DOI:
- Bibcode:
- 1985IJQE...21..860R
- Keywords:
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- Current Density;
- Electron Beams;
- Free Electron Lasers;
- Linear Accelerators;
- Brightness;
- Brillouin Zones;
- Cyclotron Frequency;
- Energy Conservation;
- Radio Frequencies;
- Wiggler Magnets;
- Lasers and Masers