Various schemes for electron cyclotron resonance heating
of tokamak plasmas with the ratio of electron plasma frequency
to electron cyclotron frequency, "»pe/^ce* larger than 1 on
axis, are investigated. In particular, a mode conversion scheme
is investigated using ordinary waves at the fundamental of the
electron cyclotron frequency. These are injected obliquely from
the outside of the tokamak near an optimal angle to the magnetic
field lines. This method involves two mode conversions. The ordinary
waves are converted into extraordinary waves near the plasma
cut-off layer. The extraordinary waves are subsequently converted
into electrostatic electron Bernstein waves at the upper hybrid
resonance layer, and the Bernstein waves are completely absorbed
close to the plasma centre. Results are presented from ray-tracinq
calculations in full three-dimensional geometry using the dispersion
function for a hot non-relativistic plasma. Radial profiles
for the power deposition and the non-inductive wave-driven
current due to the Bernstein waves are calculated for realistic
antenna radiation patterns with parameters corresponding to the
Danish tokamak DANTE and to Princeton's PLT.

Place of Publication | Roskilde |
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Publisher | Risø National Laboratory |
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Number of pages | 88 |
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ISBN (Print) | 87-55-01243-4 |
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Publication status | Published - 1986 |
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Series | Risø-M |
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Number | 2594 |
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ISSN | 0418-6435 |
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