Abstract
Calculations show that the fast wave near the lower hybrid frequency may be launched efficiently into large tokamak plasmas. Coupling efficiency is calculated for waves, which may be useful for current drive experiments in the Princeton Large Torus, the Tokamak Fusion Test Reactor, and reactor grade plasmas.
Highlights
Significant advances have been made with lower hybrid (LH) waves for generating steady-state currents in tokamaks
The tokamak experiments appear to work well only for densities where the wave frequency is well above the LH frequency, w2 ;.:::: 4w[H = 4w;;l(l + w;e l wJe)· the highenergy densities cause some uncertainty about the future role of parametric decay[89] and turbulence. 10
With strong attention given to LH current drive in addition to ion heating, it is worthwhile to examine the feasibility of fast wave current drive (FWCD)
Summary
Calculations show that the fast wave near the lower hybrid frequency (we;
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