Internal Transport Barrier Driven by Redistribution of Energetic Ions

[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.

[发布日期] 2004-11-12 [发布机构] Princeton University. Plasma Physics Laboratory.

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