Abstract
The problem of far‐field sheath formation is studied with a new quantitative 1D model. These sheaths occur when unabsorbed fast waves (FW) are incident on a conducting surface not aligned with a flux surface. Use of a nonlinear sheath BC gives self‐consistent solutions for the wave fields and sheath, and incorporates a sheath plasma wave (SPW) resonance which enhances the sheath potential. The model is applied to edge fields computed by the AORSA‐1D full‐wave code for a typical D(H) minority heating scenario. This work indicates the conditions under which far‐field sheaths can explain some of the “missing power” (low heating efficiency) and rf‐specific impurity generation in ICRF experiments.
Published Version
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