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Title: Mitigation of Alfvenic activity by 3D magnetic perturbations on NSTX

Abstract

Observations on the National Spherical Torus eXperiment (NSTX) indicate that externally applied non-axisymmetric magnetic perturbations (MP) can reduce the amplitude of Toroidal Alfven Eigenmodes (TAE) and Global Alfven Eigenmodes (GAE) in response to pulsed n=3 non-resonant fields. From full-orbit following Monte Carlo simulations with the 1- and 2-fluid resistive MHD plasma response to the magnetic perturbation included, it was found that in response to MP pulses the fast-ion losses increased and the fast-ion drive for the GAEs was reduced. The MP did not affect the fast-ion drive for the TAEs significantly but the Alfven continuum at the plasma edge was found to be altered due to the toroidal symmetry breaking which leads to coupling of different toroidal harmonics. The TAE gap was reduced at the edge creating enhanced continuum damping of the global TAEs, which is consistent with the observations. Furthermore, the results suggest that optimized non-axisymmetric MP might be exploited to control and mitigate Alfven instabilities by tailoring the fast-ion distribution function and/or continuum structure.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [3];  [4];  [1];  [1];  [4];  [1]; ORCiD logo [1];  [5]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. General Atomics, San Diego, CA (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of California, Los Angeles, CA (United States)
  5. Univ. of California, Irvine, Irvine, CA (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Contributing Org.:
Princeton Plasma Physics Laboratory; General Atomics; Oak Ridge National Laboratory; University of California, Los Angeles; University of California, Irvine.
OSTI Identifier:
1253781
Alternate Identifier(s):
OSTI ID: 1260290
Report Number(s):
PPPL-5237
Journal ID: ISSN 0741-3335; TRN: US1601722
Grant/Contract Number:  
AC02-09CH11466; SCG903402; FG02-99ER54527; FC02-04ER54698; SC-G903402; FC02-04-ER54698
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 58; Journal Issue: 8; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; tokamaks; NSTX; wave interaction; particles; 3D magnetic fields

Citation Formats

Kramer, G. J., Bortolon, A., Ferraro, N. M., Spong, D. A., Crocker, N. A., Darrow, D. S., Fredrickson, E. D., Kubota, S., Park, J. -K., Podesta, M., and Heidbrink, W. W. Mitigation of Alfvenic activity by 3D magnetic perturbations on NSTX. United States: N. p., 2016. Web. doi:10.1088/0741-3335/58/8/085003.
Kramer, G. J., Bortolon, A., Ferraro, N. M., Spong, D. A., Crocker, N. A., Darrow, D. S., Fredrickson, E. D., Kubota, S., Park, J. -K., Podesta, M., & Heidbrink, W. W. Mitigation of Alfvenic activity by 3D magnetic perturbations on NSTX. United States. doi:10.1088/0741-3335/58/8/085003.
Kramer, G. J., Bortolon, A., Ferraro, N. M., Spong, D. A., Crocker, N. A., Darrow, D. S., Fredrickson, E. D., Kubota, S., Park, J. -K., Podesta, M., and Heidbrink, W. W. Tue . "Mitigation of Alfvenic activity by 3D magnetic perturbations on NSTX". United States. doi:10.1088/0741-3335/58/8/085003. https://www.osti.gov/servlets/purl/1253781.
@article{osti_1253781,
title = {Mitigation of Alfvenic activity by 3D magnetic perturbations on NSTX},
author = {Kramer, G. J. and Bortolon, A. and Ferraro, N. M. and Spong, D. A. and Crocker, N. A. and Darrow, D. S. and Fredrickson, E. D. and Kubota, S. and Park, J. -K. and Podesta, M. and Heidbrink, W. W.},
abstractNote = {Observations on the National Spherical Torus eXperiment (NSTX) indicate that externally applied non-axisymmetric magnetic perturbations (MP) can reduce the amplitude of Toroidal Alfven Eigenmodes (TAE) and Global Alfven Eigenmodes (GAE) in response to pulsed n=3 non-resonant fields. From full-orbit following Monte Carlo simulations with the 1- and 2-fluid resistive MHD plasma response to the magnetic perturbation included, it was found that in response to MP pulses the fast-ion losses increased and the fast-ion drive for the GAEs was reduced. The MP did not affect the fast-ion drive for the TAEs significantly but the Alfven continuum at the plasma edge was found to be altered due to the toroidal symmetry breaking which leads to coupling of different toroidal harmonics. The TAE gap was reduced at the edge creating enhanced continuum damping of the global TAEs, which is consistent with the observations. Furthermore, the results suggest that optimized non-axisymmetric MP might be exploited to control and mitigate Alfven instabilities by tailoring the fast-ion distribution function and/or continuum structure.},
doi = {10.1088/0741-3335/58/8/085003},
journal = {Plasma Physics and Controlled Fusion},
number = 8,
volume = 58,
place = {United States},
year = {2016},
month = {7}
}

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Works referenced in this record:

Mitigation of Alfven activity by 3D magnetic perturbations on NSTX
dataset, January 2016

  • Kramer, G.; Bortolon, A.; Ferraro, N.
  • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
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Observation of Nonlinear Frequency-Sweeping Suppression with rf Diffusion
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Reversed shear Alfvén eigenmode stabilization by localized electron cyclotron heating
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Mitigation of NBI-driven Alfvén eigenmodes by electron cyclotron heating in the TJ-II stellarator
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Weak effect of ion cyclotron acceleration on rapidly chirping beam-driven instabilities in the National Spherical Torus Experiment
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Fast-ion redistribution and loss due to edge perturbations in the ASDEX Upgrade, DIII-D and KSTAR tokamaks
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Mitigation of Alfvén Activity in a Tokamak by Externally Applied Static 3D Fields
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Computation of three-dimensional tokamak and spherical torus equilibria
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Exploration of spherical torus physics in the NSTX device
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Kinetic extensions of magnetohydrodynamics for axisymmetric toroidal plasmas
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Frequency Chirping of Core-Localized Toroidicity-Induced Alfvén Eigenmodes and their Coupling to Global Alfvén Eigenmodes
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On Demand Triggering of Edge Localized Instabilities Using External Nonaxisymmetric Magnetic Perturbations in Toroidal Plasmas
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High spatial sampling global mode structure measurements via multichannel reflectometry in NSTX
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Theory and observations of high frequency Alfv n eigenmodes in low aspect ratio plasmas
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Compressional Alfvén eigenmode instability in NSTX
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Alfven cyclotron instability and ion cyclotron emission
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Central flattening of the fast-ion profile in reversed-shear DIII-D discharges
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Calculations of two-fluid magnetohydrodynamic axisymmetric steady-states
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Some properties of the M3D-C1 form of the three-dimensional magnetohydrodynamics equations
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Plasma shaping effects on the geodesic acoustic mode in the large orbit drift width limit
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Equilibrium analysis of current profiles in tokamaks
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A description of the full-particle-orbit-following SPIRAL code for simulating fast-ion experiments in tokamaks
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The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library
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Hybrid guiding-centre/full-orbit simulations in non-axisymmetric magnetic geometry exploiting general criterion for guiding-centre accuracy
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Fast ion transport during applied 3D magnetic perturbations on DIII-D
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Calculations of two-fluid linear response to non-axisymmetric fields in tokamaks
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Stability of global Alfven waves (TAE, EAE) in JET tritium discharges
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Operation of the NSTX Thomson scattering system
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Radial resolution enhancement of the NSTX Thomson scattering diagnostic
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Fast-ion energy loss during TAE avalanches in the National Spherical Torus Experiment
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Nonlinear Dynamics of a Driven Mode near Marginal Stability
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Energetic particle physics in fusion research in preparation for burning plasma experiments
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Shear Alfvén continua in stellarators
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Steepest-descent moment method for three-dimensional magnetohydrodynamic equilibria
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Modeling fast-ion transport during toroidal Alfvén eigenmode avalanches in National Spherical Torus Experiment
journal, December 2009

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  • DOI: 10.1063/1.3265965

Calculation of continuum damping of Alfvén eigenmodes in tokamak and stellarator equilibria
journal, September 2015

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Confinement of High-Energy Trapped Particles in Tokamaks
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Numerical optimization of three-dimensional coils for NSTX-U
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    Works referencing / citing this record:

    Modeling fast-ion transport during toroidal Alfvén eigenmode avalanches in National Spherical Torus Experiment
    journal, December 2009

    • Fredrickson, E. D.; Crocker, N. A.; Bell, R. E.
    • Physics of Plasmas, Vol. 16, Issue 12
    • DOI: 10.1063/1.3265965

    Major minority: energetic particles in fusion plasmas
    journal, March 2011


    Reversed shear Alfvén eigenmode stabilization by localized electron cyclotron heating
    journal, February 2008


    High spatial sampling global mode structure measurements via multichannel reflectometry in NSTX
    journal, August 2011


    Fast-ion redistribution and loss due to edge perturbations in the ASDEX Upgrade, DIII-D and KSTAR tokamaks
    journal, November 2013


    Central flattening of the fast-ion profile in reversed-shear DIII-D discharges
    journal, June 2008


    Mitigation of Alfven activity by 3D magnetic perturbations on NSTX
    dataset, January 2016

    • Kramer, G.; Bortolon, A.; Ferraro, N.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1562024

    Simulations of alpha parameters in a TFTR DT supershot with high fusion power
    journal, December 1995


    Fast ion transport during applied 3D magnetic perturbations on DIII-D
    journal, June 2015


    Numerical optimization of three-dimensional coils for NSTX-U
    journal, September 2015


    Plasma shaping effects on the geodesic acoustic mode in the large orbit drift width limit
    journal, September 2010


    Radial resolution enhancement of the NSTX Thomson scattering diagnostic
    journal, October 2012

    • LeBlanc, B. P.; Diallo, A.; Labik, G.
    • Review of Scientific Instruments, Vol. 83, Issue 10
    • DOI: 10.1063/1.4738655

    Equilibrium analysis of current profiles in tokamaks
    journal, June 1990


    Calculation of continuum damping of Alfvén eigenmodes in tokamak and stellarator equilibria
    journal, September 2015

    • Bowden, G. W.; Hole, M. J.; Könies, A.
    • Physics of Plasmas, Vol. 22, Issue 9
    • DOI: 10.1063/1.4930209

    Operation of the NSTX Thomson scattering system
    journal, March 2003

    • LeBlanc, B. P.; Bell, R. E.; Johnson, D. W.
    • Review of Scientific Instruments, Vol. 74, Issue 3
    • DOI: 10.1063/1.1532763

    Shear Alfvén continua in stellarators
    journal, August 2003

    • Spong, D. A.; Sanchez, R.; Weller, A.
    • Physics of Plasmas, Vol. 10, Issue 8
    • DOI: 10.1063/1.1590316

    Calculations of two-fluid magnetohydrodynamic axisymmetric steady-states
    journal, November 2009


    Experimental studies on fast-ion transport by Alfvén wave avalanches on the National Spherical Torus Experiment
    journal, May 2009

    • Podestà, M.; Heidbrink, W. W.; Liu, D.
    • Physics of Plasmas, Vol. 16, Issue 5
    • DOI: 10.1063/1.3080724

    Calculations of two-fluid linear response to non-axisymmetric fields in tokamaks
    journal, May 2012


    Steepest-descent moment method for three-dimensional magnetohydrodynamic equilibria
    journal, January 1983


    Theory and observations of high frequency Alfv n eigenmodes in low aspect ratio plasmas
    journal, March 2003


    Nature of Monster Sawteeth and Their Relationship to Alfvén Instabilities in Tokamaks
    journal, February 2000


    The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library
    journal, June 2004

    • Pankin, Alexei; McCune, Douglas; Andre, Robert
    • Computer Physics Communications, Vol. 159, Issue 3
    • DOI: 10.1016/j.cpc.2003.11.002

    Weak effect of ion cyclotron acceleration on rapidly chirping beam-driven instabilities in the National Spherical Torus Experiment
    journal, August 2006

    • Heidbrink, W. W.; Ruskov, E.; Fredrickson, E. D.
    • Plasma Physics and Controlled Fusion, Vol. 48, Issue 9
    • DOI: 10.1088/0741-3335/48/9/006

    Some properties of the M3D-C1 form of the three-dimensional magnetohydrodynamics equations
    journal, September 2009

    • Breslau, J.; Ferraro, N.; Jardin, S.
    • Physics of Plasmas, Vol. 16, Issue 9
    • DOI: 10.1063/1.3224035

    Compressional Alfvén eigenmode instability in NSTX
    journal, August 2002


    A description of the full-particle-orbit-following SPIRAL code for simulating fast-ion experiments in tokamaks
    journal, January 2013


    Computation of three-dimensional tokamak and spherical torus equilibria
    journal, May 2007

    • Park, Jong-kyu; Boozer, Allen H.; Glasser, Alan H.
    • Physics of Plasmas, Vol. 14, Issue 5
    • DOI: 10.1063/1.2732170

    Toroidal Alfvén eigenmode‐induced ripple trapping
    journal, August 1995

    • White, R. B.; Fredrickson, E.; Darrow, D.
    • Physics of Plasmas, Vol. 2, Issue 8
    • DOI: 10.1063/1.871452

    Energetic particle physics in fusion research in preparation for burning plasma experiments
    journal, November 2014


    Systematic study of toroidicity-induced Alfvén eigenmodes at low- q discharges in JT-60U
    journal, September 1998


    Suppression of nonlinear frequency-sweeping of resonant interchange modes in a magnetic dipole with applied radio frequency fields
    journal, May 2003

    • Maslovsky, D.; Levitt, B.; Mauel, M. E.
    • Physics of Plasmas, Vol. 10, Issue 5
    • DOI: 10.1063/1.1557072

    Mitigation of NBI-driven Alfvén eigenmodes by electron cyclotron heating in the TJ-II stellarator
    journal, July 2013


    Fast-ion energy loss during TAE avalanches in the National Spherical Torus Experiment
    journal, December 2012


    Stability of global Alfven waves (TAE, EAE) in JET tritium discharges
    journal, May 1994

    • Kerner, W.; Borba, D.; Huysmans, G. T. A.
    • Plasma Physics and Controlled Fusion, Vol. 36, Issue 5
    • DOI: 10.1088/0741-3335/36/5/011

    Basic physics of Alfvén instabilities driven by energetic particles in toroidally confined plasmas
    journal, May 2008


    Hybrid guiding-centre/full-orbit simulations in non-axisymmetric magnetic geometry exploiting general criterion for guiding-centre accuracy
    journal, April 2015


    Stellarator Research Opportunities: A Report of the National Stellarator Coordinating Committee
    journal, February 2018


    Stellarator Research Opportunities: A Report of the National Stellarator Coordinating Committee
    journal, February 2018


    Recent advances in stellarator optimization
    journal, October 2017