Kinetic Modifications to MHD Phenomena in Toroidal Plasmas

Cheng, C.Z. ; Gorelenkov, N.N. ; Kramer, G.J. ; Fredrickson, E.

Princeton University. Plasma Physics Laboratory.

关键词: Trapped Electrons Alfven Waves;    Modifications;    Toroidicity-Induced Alfven Eigenmode (Tae);    Finite Larmor Effects;    70 Plasma Physics And Fusion Technology;   

DOI  :  10.2172/835899
RP-ID  :  PPPL-4005
RP-ID  :  AC02-76CH03073
RP-ID  :  835899

美国|英语

来源: UNT Digital Library

【 摘 要 】

Particle kinetic effects involving small spatial and fast temporal scales can strongly affect MHD phenomena and the long time behavior of plasmas. In particular, kinetic effects such as finite ion gyroradii, trapped particle dynamics, and wave-particle resonances have been shown to greatly modify the stability of MHD modes. Here, the kinetic effects of trapped electron dynamics and finite ion gyroradii are shown to have a large stabilizing effect on kinetic ballooning modes in low aspect ratio toroidal plasmas such as NSTX [National Spherical Torus Experiment]. We also present the analysis of Toroidicity-induced Alfven Eigenmodes (TAEs) destabilized by fast neutral-beam injected ions in NSTX experiments and TAE stability in ITER due to alpha-particles and MeV negatively charged neutral beam injected ions.