Abstract
ac magnetic helicity injection (also known as oscillating field current drive, OFCD) has been proposed as a technique to sustain the plasma current in a reversed field pinch. The three-dimensional, resistive magnetohydrodynamics computation is employed to examine the full nonlinear dynamics of OFCD, including the behavior of plasma fluctuations and instabilities. The three-dimensional results are also compared with one-dimensional classical and relaxed-state modeling. In OFCD, helicity is injected by oscillating the toroidal and poloidal surface loop voltages. This technique is able to sustain the plasma current, with the edge current mainly driven directly by the OFCD-generated fields, and the core current driven by plasma fluctuations. Fluctuations increase with OFCD, although the increase is concentrated mainly in one global, nearly ideal, mode.
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