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Proceedings Paper

Applications of high-power millimeter waves in the DIII-D fusion program
Author(s): Richard L. Freeman
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Paper Abstract

First operation of a new generation of MW level, 110 GHz generator on the DIII-D fusion experimental device has been achieved. THe desire for high power, cw millimeter (mm) wave sources to support fusion research and development is just now beginning to be realized. Plasma heating and current drive with directed mm waves rely on the strong absorption achieved when the wave frequency matches the natural 'cyclotron' frequency of electrons in a magnetic field, or its harmonics. Recent progress in fusion experiments highlights the need for control of the interior details of the hot plasma, and mm wave systems are ideally suited for this role. A brief status of fusion research is given, and the importance of mm waves in the future directions for fusion research is described. The vacuum transmission components necessary for transmitting, monitoring, and launching high power 110 GHz waves into a plasma have been developed at General Atomics and will be described. High power mm waves have a number of attractive technological features for fusion applications compared with other candidate plasma heating and current drive technologies. Millimeter waves can be transmitted with high power density over large distances with low losses by utilizing corrugated waveguides, so the generators can be sited remotely, facilitating maintenance and saving valuable space near the fusion device.

Paper Details

Date Published: 18 December 1996
PDF: 10 pages
Proc. SPIE 2842, Millimeter and Submillimeter Waves and Applications III, (18 December 1996); doi: 10.1117/12.262748
Show Author Affiliations
Richard L. Freeman, General Atomics (United States)

Published in SPIE Proceedings Vol. 2842:
Millimeter and Submillimeter Waves and Applications III
Mohammed N. Afsar, Editor(s)

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