PPPL-3231 is available in pdf or postscript formats.

Alpha-Driven Magnetohydrodynamics (MHD) and MHD-Induced Alpha Loss ion the Tokamak Fusion Test Reactor

Authors: Z. Chang, R. Nazikian, G.-Y. Fu, et al

Abstract Alpha-driven toroidal Alfven eigenmodes (TAEs) are observed as predicted by theory in the post neutral beam phase in high central q (safety factor) deuterium-tritium (D-T) plasmas in the Tokamak Fusion Test Reactor (TFTR) [D. J. Grove and D. M. Meade, Nucl. Fusion 25, 1167 (1985)]. The mode location, poloidal structure and the importance of q proAElefor TAE instability are discussed. So far no alpha particle loss due to these modes was detected due to the small mode amplitude. However, alpha loss induced by kinetic ballooning modes (KBMs) was observed in high-conAEnementD-T discharges. Particle orbit simulation demonstrates that the wave-particle resonant interaction can explain the observed correlation between the increase in alpha loss and appearance of multiple high-n (n 6 , n is the toroidal mode number) modes.