Abstract
Current drive by coaxial helicity injection in the Sustained Spheromak Physics Experiment (SSPX) is modeled by a hyper-resistive term in Ohm's law for discharges in which magnetic fluctuations are small (1–3%). The current on the open magnetic field lines from the applied vacuum bias flux is assumed completely relaxed; interior to the spheromak, the helicity flux balances the ohmic losses. The poloidal area of the spheromak is found to depend on the strength of the hyper-resistive diffusion coefficient, allowing potentially large amplifications of the vacuum flux and discharge current. One discharge is examined in detail; the best fit to the experimental data finds that a limited fraction of the helicity injected into the flux conserver is effectively applied to current drive interior to the spheromak.
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From Fizika Plazmy, Vol. 28, No. 9, 2002, pp. 831–839.
Original English Text Copyright © 2002 by Hooper, Pearlstein.
This article was submitted by the authors in English.
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Hooper, E.B., Pearlstein, L.D. Hyper-resistive modeling in the spheromak. Plasma Phys. Rep. 28, 765–772 (2002). https://doi.org/10.1134/1.1508027
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DOI: https://doi.org/10.1134/1.1508027