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17–22 Oct 2016
Kyoto International Conference Center
Japan timezone

Parametric dependence of EPMs in NSTX

19 Oct 2016, 14:00
4h 45m
Kyoto International Conference Center

Kyoto International Conference Center

Takaragaike, Sakyo-ku, Kyoto 606-0001 Japan
Poster EXW - Magnetic Confinement Experiments: Wave–plasma interactions; current drive; heating; energetic particles Poster 4

Speaker

Eric Fredrickson (PPPL)

Description

The International Tokamak Experimental Reactor (ITER) will have a large population of non-thermal, energetic ions consisting of fusion generated alphas and beam ions injected for current profile control. Potential redistribution and/or loss of those non-thermal ions is thus of concern as it will modify heating profiles, current profiles, and could lead to unacceptable levels of heating of plasma facing components. Redistribution and losses of fast ions have been documented as resulting from multiple Alfvénic modes, Toroidal Alfvén Eigenmodes and energetic particle modes (fishbones) on many smaller plasma devices. In this paper we present data and analysis of modes driven by neutral beam ions on the National Spherical Torus Experiment (NSTX). Fishbone-like EPMs are found predominantly in plasmas with qmin ≈ 1. The long-lived modes, beginning with a frequency chirp (EPM-LLM), typically appear for a broad range of qmin with 1 < qmin < 4, and the frequency chirp is predominantly a result of a drop in the core toroidal rotation.
Country or International Organization USA
Paper Number EX/P4-41

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