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A correlation between the measured alpha particle loss and high frequency ( ~100--200 kHz) magnetohydrodynamic (MHD) modes has been observed in some high {β} ( 0ex0ex=0ex0ex plasma pressure/magnetic pressure) DT plasmas in TFTR. These modes are localized around the peak plasma pressure gradient and have ballooning characteristics. Particle simulation shows that the loss is due to wave-particle resonances. Linear instability analysis indicates that the plasma is unstable to the kinetic MHD ballooning modes driven by strong local pressure gradients.
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Chang et al. (1996) studied this question.
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