Review of Quasi-Optical Gyrotron Development
Abstract
There is currently a need for megawatt average power sources of 100- 600 GHz radiation for electron cyclotron heating of fusion plasmas. One of the leading candidates for such a source, the conventional waveguide cavity gyrotron, has produced impressive output powers and efficiencies at frequencies up to about 300 GHz. However, this gyrotron configuration is limited at high frequencies by high ohmic heating and problems with transverse mode competition due to the highly overmoded configuration, and with beam collection, since the beam must be collected along a section of the output waveguide. The quasi- optical gyrotron (QOG) features an open resonator formed by a pair of spherical mirrors instead of a waveguide resonator and has the potential for overcoming each of these limitations. The resonator mirrors can be well removed from the beam-wave interaction region, allowing a large volume for the interaction and low ohmic heating densities at the mirrors. The beam direction is transverse to the resonator so that beam collection is separate from the output waveguide. Keywords: High efficiency; Low power; Cavity resonators; Q factors. (JHD)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 18, 1989
- Accession Number
- ADA213491
Entities
People
- Arne W. Fliflet
- Phillip A. Sprangle
- R. P. Fischer
- T. A. Hargreaves
- Wallace M. Manheimer
Organizations
- United States Naval Research Laboratory