Axisymmetric instability in a noncircular tokamak [electronic resource] : experiment and theory
- Madison, Wis. : University of Wisconsin--Madison, 1979.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 49 : digital, PDF file
- Additional Creators:
- University of Wisconsin--Madison
United States. Department of Energy. Office of Scientific and Technical Information
- The stability of dee, inverse-dee and square cross section plasmas to axisymmetric modes has been investigated experimentally in Tokapole II, a tokamak with a four-null poloidal divertor. Experimental results are closely compared with predictions of two numerical stability codes -- the PEST code (ideal MHD, linear stability) adapted to tokapole geometry and a code which follows the nonlinear evolution of shapes similar to tokapole equilibria. Experimentally, the square is vertically stable and both dee's unstable to a vertical nonrigid axisymmetric shift. The central magnetic axis displacement grows exponentially with a growth time approximately 10/sup 3/ poloidal Alfven times plasma time. Proper initial positioning of the plasma on the midplane allows passive feedback to nonlinearly restore vertical motion to a small stable oscillation. Experimental poloidal flux plots are produced directly from internal magnetic probe measurements.
- Published through SciTech Connect.
Prager, S.C.; Lipschultz, B.; Todd, A.M.M.; Delucia, J.
- Funding Information:
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