High power RF windows in fusion reactors

L. Rebuffi

doi:10.1117/12.2297935

1 October 1991 High power RF windows in fusion reactors

L. Rebuffi

Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 157666 (1991) https://doi.org/10.1117/12.2297935
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland

Abstract

The main functions of RF windows in fusion reactors are: to act as a first barrier for tritium and radioactive dust, and to provide vacuum containment. They must have low RF losses. The lifetime must be satisfactory (>5 years); nevertheless maintenance by remote handling must be foreseen. Valves or shutters are needed to improve safety. The tokamak windows will be placed in a screened area where they will receive a maximum dose of about 10^16-17 n/cm² over their life, to avoid degradation of their dielectric and mechanical properties. The coolant must be an inert fluid to avoid damages to other materials of the machine in case of leakage. In ITER [1], the most demanding working conditions are those of the windows of the Electron Cyclotron (EC) system which should support 1 MW, CW in the 120 - 140 GHz range (probably at fixed frequency) in a gaussian or HE₁₁ mode. In the Lower Hybrid (LH) system the windows will have to transmit 1 MW, CW at about 5 GHz.

Citation Download Citation

L. Rebuffi "High power RF windows in fusion reactors", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 157666 (1 October 1991); https://doi.org/10.1117/12.2297935

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