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- W2057941146 abstract "Analyses of ideal MHD stabilities of high βp plasmas show that the occurrence of βp collapse in JT-60U is consistent with the violation of the low n kink mode stability boundary. It is demonstrated theoretically that the pressure profile, internal inductance, li, qs/q0 and βp influence the ideal stability limit, g, imposed by the low n kink mode and the infinite n ballooning mode; here, g = βt/(I/aBt). Peaking of the pressure profile decreases the stability limit g to low values (2-1.5) in both high li (≈ 1.2) and low li (≈ 0.8) plasmas, though the maximum g value does not strongly depend on βp and qs/q0. In a high li plasma with peaked pressure, the stability limit is determined by internal low n kink modes, especially by the infernal mode in the low q0 region, while, in the low li plasma, it is determined by the infinite n ballooning mode. Broadening of the pressure profile combined with the high li (≈ 1.2) significantly increases the stability limit g (≈ 5) and makes the displacement more global, though the g value decreases with βp for fixed values of qs/q0. Experimentally, by the broadening of the pressure profile with high li (>1.2), high g (≈ 4) plasmas are obtained and no βp collapse is observed, which is consistent with non-violation of the ideal MHD stability boundary" @default.
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- W2057941146 date "1995-07-01" @default.
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- W2057941146 title "Ideal MHD stability of high <sub>p</sub>plasmas and <sub>p</sub>collapse in JT-60U" @default.
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- W2057941146 doi "https://doi.org/10.1088/0029-5515/35/7/i09" @default.
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