2013•Plasma and Fusion ResearchOpen access

MHD Instabilities in Tokamak Plasmas with Hollow Current Density Profiles

Goshi Yamada, Y. Nakamura, Katsumi Kondo

Abstract

We analyze linear instability in low beta tokamak plasmas with nonmonotonic q-profiles using resistive magnetohydrodynamic equations. We consider n = 2 (where n is the toroidal mode number) modes for configurations where qmin is close to 1.5 and sufficiently below 2 so that the separation of the rational surfaces with q = 2 is large. Similar instability characteristics arise when qmin is slightly and moderately above 1.5.

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Key concepts: Tokamak, Magnetohydrodynamic drive, Magnetohydrodynamics, Toroid, Plasma, Instability, Physics, Resistive touchscreen