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(ICP/13) Reactor Advantages of the Belt Pinch and Liquid Metal Walls

M. Kotschenreuther¹⁾, J. Manickam²⁾, J. Menard²⁾, H. Rappaport, L.-J. Zheng, B. Dorland³⁾, R. Miller⁴⁾, A. D. Turnbull^4)
 
1) Institute for Fusion Studies, Austin, TX USA
²⁾ Princeton Plasma Physics Laboratory, Princeton, NJ USA
³⁾ Institute for Plasma Research, College Park, MD USA
⁴⁾ General Atomics, San Diego, CA USA

Abstract.  MHD stability of highly elongated tokamaks (termed a belt pinch) are considered for high bootstrap fraction cases. By employing high triangularity or indentation, and invoking wall stabilization, and $\beta$ can be increased by a factor of roughly 3 by increasing $\kappa$ from 2 to 4. Axisymmetric stability up to $\kappa$ = 4 tolerable by employing a shell which conforms more closely to the boundary than in present experiments. Engineering difficulties with a close fitting shell in a reactor environment may be overcome by employing a liquid lithium alloy shell. Rapid metal flows can lead to potentially deleterious plasma shifts and damping of the flow.

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