A comparison of relativistic Cherenkov-FELs, orotrons and undulator FELs as radiation sources in the sub-millimeter region
Abstract
Undulator free-electron lasers, Cherenkov-FELs and orotrons are compared as coherent radiation sources in the sub-millimeter wavelength range. Electrodynamics and the "beam-field" interaction of the devices are considered. The dependencies of the small-signal gain on the interaction length, radiation frequency and other parameters are analyzed. Using the idea of the optical klystron, the relativistic double-grating orotron (DOR) is introduced. It consists of two short gratings with a flight gap between them and a quasi-optical cavity to form the coherent electromagnetic fields on the gratings. The analysis of the DOR gain shows the possibility to obtain sub-millimeter wavelength generation with a simple relativistic device.
- Publication:
-
Nuclear Instruments and Methods in Physics Research A
- Pub Date:
- February 1998
- DOI:
- 10.1016/S0168-9002(97)01051-6
- Bibcode:
- 1998NIMPA.405..248B