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Updated: May 18, 2026

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
Published on: February 22, 2018
Fast-particle-driven Alfvénic modes in a reversed field pinch
J J Koliner1, C B Forest, J S Sarff
1Physics Department, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. koliner@wisc.edu
Abstract:
Alfvénic 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 Alfvénic scaling is observed.
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