Abstract
The interaction is studied of TdeV plasma edge electrons with the electric near-field generated by a lower hybrid slow wave antenna. For waveguide electric fields, typically around 3 kV/cm, the higher-order modes overlap, so that the relatively cold (∼25 eV) scrape off layer (SOL) electrons can resonantly accelerate. For TdeV conditions and for 90° waveguide array phasing, the stochastic limit in the co-current direction is about 2 keV, determined by the 5th harmonic—the last overlapping mode. The progress of electrons through accessible phase space is very efficient: the TdeV 32 waveguide array can accelerate the electrons to the possible limit. We calculate that between 35 and 70 kW is transferred from the wave to the SOL electrons.
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