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Internal transport barrier driven by redistribution of energetic ions

  • Author(s): Wong, KL
  • Heidbrink, WW
  • Ruskov, E
  • Petty, CC
  • Greenfield, CM
  • Nazikian, R
  • Budny, R
  • et al.
Abstract

Alfvén 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 α particles for improvement of burning plasma performance is discussed.

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