Microwave coupling in EBT reactor
Abstract
For a typical size ELMO Bumpy Torus (EBT) reactor (approximately 1000 MWe), microwave frequencies required lie in the range of 60-110 GHz at power levels of 50-75 MW. As the frequency rises, the unloaded cavity (i.e., without plasma) quality factor Q decreases. Because of the short wavelengths of microwave heating power and the large cavity dimensions of a reactor, it is possible to apply quasi-optical principles in the efficient coupling of power to the plasma. The use of a confocal Fabry-Perot resonator with spherical mirrors is discussed; these serve to confine the microwave power to the region occupied by the plasma. The potential advantages of these resonators include high-efficiency utilization of microwave power, minimal thermal burden on the cryopumping system, and significant benefit in preventing microwave leakage from the device. An estimation of the unloaded cavity quality factor Q and the design considerations of Fabry-Perot resonator are given.
- Publication:
-
8th Symposium on Engineering Problems of Fusion Research
- Pub Date:
- 1979
- Bibcode:
- 1979epfr.conf..956U
- Keywords:
-
- Bumpy Toruses;
- Fusion Reactors;
- Lithium Cooled Reactor Experiment;
- Microwave Coupling;
- Plasma Heating;
- Radio Frequency Heating;
- Cavity Resonators;
- Cryopumping;
- Cyclotrons;
- Diffraction;
- Energy Dissipation;
- Energy Transfer;
- Hot Electrons;
- Reactor Safety;
- Reflectors;
- Plasma Physics