2012•IEEJ Transactions on Fundamentals and MaterialsOpen access

Neoclassical Tearing Mode Analysis in Spherical Tokamak Burning Plasmas

Daiki Kurita, K. Yamazaki, H. Arimoto, T. Oishi, Tatsuo Shoji

Abstract

For stabilization of neoclassical tearing mode (NTM), non-resonant helical field (NRHF) is investigated. The time variation of magnetic island is described by modified Rutherford equation. In this work, plasma parameter change due to NTM is analyzed using 1.5-dimensional transport code TOTAL. In ST plasma, magnetic island at 3/2 mode grows by bootstrap current and the central temperature decreases. If NRHF is added, the effect of bootstrap current decreases and NTM is stabilized.

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Key concepts: Tearing, Tokamak, Bootstrap current, Plasma, Physics, Current (fluid), Mode (computer interface), Magnetic field