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.
Published Web Locationhttps://doi.org/10.1088/0029-5515/45/1/004
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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