Internal Transport Barrier Driven by Redistribution of Energetic Ions

Wong, K.L. ; Heidbrink, W.W. ; Ruskov, E. ; Petty, C.C. ; Greenfield, C.M. ; Nazikian, R. ; Budny, R.

Princeton University. Plasma Physics Laboratory.

关键词: Tail Ions;    70 Plasma Physics And Fusion Technology;    Pressure Gradients;    Transport Alfven Waves;    Doublet-3 Device;   

DOI  :  10.2172/836156
RP-ID  :  PPPL-4023
RP-ID  :  AC02-76CH03073
RP-ID  :  836156

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来源: UNT Digital Library

【 摘 要 】

Alfven instabilities excited by energetic ions are used as a means to reduce the central magnetic shear in a tokamak via redistribution of energetic ions. When the central magnetic shear is low enough, ballooning modes become stable for any plasma pressure gradient and an internal transport barrier (ITB) with a steep pressure gradient can exist. This mechanism can sustain a steady-state ITB as demonstrated by experimental data from the DIII-D tokamak. It can also produce a shear in toroidal and poloidal plasma rotation. Possible application of this technique to use the energetic alpha particles for improvement of burning plasma performance is discussed.