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Published March 1983 | Published
Journal Article Open

Propagation of lower hybrid resonance cones in tokamaks


The trajectory of the lower hybrid resonance cone surface is calculated for propagation in the helical magnetic field of a tokamak. The surface is found to be a deformed cone, having symmetry axis following the magnetic field helicity. By superimposing cone fields excited by adjacent, poloidally separated point sources, the field excited by a source of finite poloidal extend is deduced. For sources having large poloidal extent, the superimposed cones destructively interfere everywhere except in a small region of constructive reinforcement which is located towards the plasma center; sources having small poloidal extent excite an individual resonance cone, which extends from near the plasma center all the way to the wall. Numerical calculations are presented for Verasator, Alcator-A and -C, JFT-2, and PLT tokamak parameters.

Additional Information

© 1983 American Institute of Physics. Received 18 May 1982; accepted 9 November 1982. This work was supported by National Science Foundation Grant No. ECS-8113533. The author is an Alfred P. Sloan Foundation Fellow.

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