Stability of the n=1 Internal Kink Mode in Plasmas with Centrally Peaked Pressure

概要

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The stability of the n = I internal kink mode in a tokamak is numerically analyzedfor plasmas with a centrally peaked pressure profile. The effect of pressure profile isstudied by the comparison of a strongly peaked pressure inside the q= 1 surface witha parabolic pressure profile. The effects of shaping, i.e., elortgation and trtangularuty,are also studied for the both pressure profiles. The plasma with the strongly peakedpressure profile has higher limiting value of poloidal beta defined within the q= 1 surface than that of the parabolic pressure profile. Though the beta limit reduces withthe increase of the elongation, the plasma with the peaked pressure profile has largerimprovement due to the triangularity than that with the parabolic pressure profile.However, to enter the second stability region of the n = I internal kink mode, theplasma with a flat pressure profile and the large minor radius of the q = 1 surface iseffective.[internal kink mode, n = 1, peaked pressure profile, MHD stability, pellet injec- ll lion, tokamak}
社団法人日本物理学会の論文
1990-12-15