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Sovinec, C.R.; Prager, S.C.
Wisconsin Univ., Madison, WI (United States). Dept. of Physics. Funding organisation: USDOE, Washington, DC (United States)1994
Wisconsin Univ., Madison, WI (United States). Dept. of Physics. Funding organisation: USDOE, Washington, DC (United States)1994
AbstractAbstract
[en] MHD computations of DC helicity injection in tokamak-like configurations show current drive with no ''loop voltage'' in a resistive, pressureless plasma. The self-consistently generated current profiles are unstable to resistive modes that partially relax the profile through the MHD dynamo mechanism. The current driven by the fluctuations leads to closed contours of average poloidal flux. However, the 1% fluctuation level is large enough to produce a region of stochastic magnetic field. A limited Lundquist number (S) scan from 2.5 x 103 to 4 x 104 indicates that both the fluctuation level and relaxation increase with S
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Dec 1994; 28 p; CONTRACT FG02-85ER53212; Also available from OSTI as DE95007018; NTIS; US Govt. Printing Office Dep
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