Nonlinear simulations of beam-driven Compressional Alfv´en Eigenmodes in NSTX

Belova, Elena V.; Gorelenkov, N. N.; Crocker, N. A.; Lestz, J. B.; Fredrickson, E. D.; Tang, S.; Tritz, K.

doi:10.1063/1.4979278

Nonlinear simulations of beam-driven Compressional Alfv´en Eigenmodes in NSTX

Journal Article · Thu Mar 09 23:00:00 EST 2017 · Physics of Plasmas (Online)

DOI:https://doi.org/10.1063/1.4979278· OSTI ID:1346987

^[1]; Gorelenkov, N. N. ^[2]; Crocker, N. A. ^[3]; Lestz, J. B. ^[2]; Fredrickson, E. D. ^[2]; Tang, S. ^[3]; Tritz, K. ^[2]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); PPPL
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of California, Los Angeles, CA (United States)

We present results for the 3D nonlinear simulations of neutral-beam-driven compressional Alfv´en eigenmodes (CAEs) in the National Spherical Torus Experiment (NSTX). Hybrid MHD-particle simulations for the H-mode NSTX discharge (shot 141398) using the HYM code show unstable CAE modes for a range of toroidal mode numbers, n = 4 - 9, and frequencies below the ion cyclotron frequency. It is found that the essential feature of CAEs is their coupling to kinetic Alfv´en wave (KAW) that occurs on the high-field side at the Alfv´en resonance location. We frequently observe high-frequency Alfv´en eigenmodes in beam-heated NSTX plasmas, and have been linked to flattening of the electron temperature profiles at high beam power. Coupling between CAE and KAW suggests an energy channeling mechanism to explain these observations, in which beam driven CAEs dissipate their energy at the resonance location, therefore significantly modifying the energy deposition profile. Nonlinear simulations demonstrate that CAEs can channel the energy of the beam ions from the injection region near the magnetic axis to the location of the resonant mode conversion at the edge of the beam density profile. Furthermore, a set of nonlinear simulations show that the CAE instability saturates due to nonlinear particle trapping, and a large fraction of beam energy can be transferred to several unstable CAEs of relatively large amplitudes and absorbed at the resonant location. Absorption rate shows a strong scaling with the beam power.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1346987

Alternate ID(s):: OSTI ID: 1358658
OSTI ID: 1363699

Journal Information:: Physics of Plasmas (Online), Journal Name: Physics of Plasmas (Online) Journal Issue: 4 Vol. 24; ISSN 1089-7674

Country of Publication:: United States

Language:: English

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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
Analytic stability boundaries for compressional and global Alfvén eigenmodes driven by fast ions. II. Interaction via Landau resonance Lestz, J. B.; Gorelenkov, N. N.; Belova, E. V. Physics of Plasmas, Vol. 27, Issue 2 https://doi.org/10.1063/1.5127552	journal	February 2020
Density perturbation mode structure of high frequency compressional and global Alfvén eigenmodes in the National Spherical Torus Experiment using a novel reflectometer analysis technique Crocker, N. A.; Kubota, S.; Peebles, W. A. Nuclear Fusion, Vol. 58, Issue 1 https://doi.org/10.1088/1741-4326/aa953e	journal	December 2017
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Analytic stability boundaries for compressional and global Alfvén eigenmodes driven by fast ions. II. Interaction via Landau resonance Lestz, J. B.; Gorelenkov, N. N.; Belova, E. V. arXiv https://doi.org/10.48550/arxiv.1909.05465	text	January 2019

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