1. Fast-Particle-Driven Alfvénic Modes in a Reversed Field Pinch
- Author
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J.J. Koliner, D. L. Brower, L. Lin, Donald A. Spong, J. S. Sarff, Mark Nornberg, Cary Forest, Weixing Ding, D. W. Liu, Jay Anderson, and J. Waksman
- Subjects
Physics ,Toroid ,Distribution function ,Reversed field pinch ,Physics::Plasma Physics ,General Physics and Astronomy ,Landau damping ,Plasma ,Atomic physics ,Instability ,Beam (structure) ,Neutral beam injection - Abstract
Alfvenic modes are observed due to neutral beam injection for the first time in a reversed field pinch plasma. Modeling of the beam deposition and slowing down shows that the velocity and radial localization are high. This allows instability drive from inverse Landau damping of a bump-on-tail in the parallel distribution function or from free energy in the fast ion density gradient. Mode switching from a lower frequency toroidal mode number n = 5 mode that scales with beam injection velocity to a higher frequency n = 4 mode with Alfvenic scaling is observed.
- Published
- 2012
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