Abstract
For a reversed magnetic shear plasma formed by early neutral beaminjection into the HL-2A tokamak, magnetohydrodynamics instabilityanalysis against ideal low-n modes and resistive interchange modes iscarried out. Low-n modes located in the low shear region around theshear reversal point are driven unstable by a large pressure gradient, andthey are of the characteristics of infernal modes. High pressure in thecentral negative shear region drives resistive interchange modes withthe unstable window extending to r/a≈0.2, but not covering thelow shear region around the shear reversal point.
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