Energetic-particle-modified global Alfven eigenmodes

Lestz, J. B.; Belova, E. V.; Gorelenkov, N. N.

doi:10.1063/1.4998602

Title: Energetic-particle-modified global Alfven eigenmodes

Journal Article · Mon Apr 30 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4998602· OSTI ID:1436767

^[1];

^[2]; Gorelenkov, N. N. ^[2]

Princeton Univ., Princeton, NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Fully self-consistent hybrid MHD/particle simulations reveal strong energetic particle modifications to sub-cyclotron global Alfvén eigenmodes (GAEs) in low-aspect ratio, NSTX-like conditions. Key parameters defining the fast ion distribution function—the normalized injection velocity v₀/v_A and central pitch—are varied in order to study their influence on the characteristics of the excited modes. It is found that the frequency of the most unstable mode changes significantly and continuously with beam parameters, in accordance with the Doppler-shifted cyclotron resonances which drive the modes, and depending most substantially on v₀/v_A. This unexpected result is present for both counter-propagating GAEs, which are routinely excited in NSTX, and high frequency co-GAEs, which have not been previously studied. Large changes in frequency without clear corresponding changes in the mode structure are signatures of an energetic particle mode, referred to here as an energetic-particle-modified GAE. In conclusion, additional simulations conducted for a fixed MHD equilibrium demonstrate that the GAE frequency shift cannot be explained by the equilibrium changes due to energetic particle effects.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1436767

Alternate ID(s):: OSTI ID: 1435388

Journal Information:: Physics of Plasmas, Vol. 25, Issue 4; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Analytic stability boundaries for compressional and global Alfvén eigenmodes driven by fast ions. I. Interaction via ordinary and anomalous cyclotron resonances Lestz, J. B.; Gorelenkov, N. N.; Belova, E. V. Physics of Plasmas, Vol. 27, Issue 2 https://doi.org/10.1063/1.5127551	journal	February 2020
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