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Title: Study of the likelihood of Alfvénic mode bifurcation in NSTX and predictions for ITER baseline scenarios

Abstract

Rare Alfvénic wave transitions between fixed-frequency and chirping phases are identified in NSTX, where Alfvénic waves are normally observed to exhibit either chirping or avalanching responses. For those transitions, we apply in this paper a criterion (Duarte et al 2017 Nucl. Fusion 57 054001) to predict the nature of fast ion redistribution in tokamaks to be in the convective or diffusive nonlinear regimes. For NSTX discharges in which the transition is not accompanied by changes in the beam deposited power or modifications in the injected radiofrequency power, it has been found that the anomalous fast ion transport is a likely mediator of the bifurcation between the fixed-frequency mode behavior and rapid chirping. For a quantitative assessment, global gyrokinetic simulations of the effects of electrostatic ion temperature gradient turbulence and trapped electron mode turbulence on chirping were pursued using the GTS code. The investigation is extended by means of predictive studies of the probable spectral behavior of Alfvénic eigenmodes for baseline ITER cases consisting of elmy, advanced and hybrid scenarios. Finally, it has been observed that most modes are found to be borderline between the steady and the chirping phases.

Authors:
ORCiD logo [1];  [2];  [2];  [2]; ORCiD logo [2];  [3]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Univ. of São Paulo (Brazil). Inst. of Physics
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Univ. of Texas, Austin, TX (United States). Inst. for Fusion Studies
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Univ. of São Paulo (Brazil)
Sponsoring Org.:
USDOE; São Paulo Research Foundation (FAPESP) (Brazil)
OSTI Identifier:
1459542
Grant/Contract Number:  
AC02-09CH11466; 2012/22830-2; 2014/03289-4
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 58; Journal Issue: 8; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Duarte, V. N., Gorelenkov, N. N., Schneller, M., Fredrickson, E. D., Podesta, M., and Berk, H. L. Study of the likelihood of Alfvénic mode bifurcation in NSTX and predictions for ITER baseline scenarios. United States: N. p., 2018. Web. doi:10.1088/1741-4326/aab37c.
Duarte, V. N., Gorelenkov, N. N., Schneller, M., Fredrickson, E. D., Podesta, M., & Berk, H. L. Study of the likelihood of Alfvénic mode bifurcation in NSTX and predictions for ITER baseline scenarios. United States. doi:10.1088/1741-4326/aab37c.
Duarte, V. N., Gorelenkov, N. N., Schneller, M., Fredrickson, E. D., Podesta, M., and Berk, H. L. Fri . "Study of the likelihood of Alfvénic mode bifurcation in NSTX and predictions for ITER baseline scenarios". United States. doi:10.1088/1741-4326/aab37c. https://www.osti.gov/servlets/purl/1459542.
@article{osti_1459542,
title = {Study of the likelihood of Alfvénic mode bifurcation in NSTX and predictions for ITER baseline scenarios},
author = {Duarte, V. N. and Gorelenkov, N. N. and Schneller, M. and Fredrickson, E. D. and Podesta, M. and Berk, H. L.},
abstractNote = {Rare Alfvénic wave transitions between fixed-frequency and chirping phases are identified in NSTX, where Alfvénic waves are normally observed to exhibit either chirping or avalanching responses. For those transitions, we apply in this paper a criterion (Duarte et al 2017 Nucl. Fusion 57 054001) to predict the nature of fast ion redistribution in tokamaks to be in the convective or diffusive nonlinear regimes. For NSTX discharges in which the transition is not accompanied by changes in the beam deposited power or modifications in the injected radiofrequency power, it has been found that the anomalous fast ion transport is a likely mediator of the bifurcation between the fixed-frequency mode behavior and rapid chirping. For a quantitative assessment, global gyrokinetic simulations of the effects of electrostatic ion temperature gradient turbulence and trapped electron mode turbulence on chirping were pursued using the GTS code. The investigation is extended by means of predictive studies of the probable spectral behavior of Alfvénic eigenmodes for baseline ITER cases consisting of elmy, advanced and hybrid scenarios. Finally, it has been observed that most modes are found to be borderline between the steady and the chirping phases.},
doi = {10.1088/1741-4326/aab37c},
journal = {Nuclear Fusion},
number = 8,
volume = 58,
place = {United States},
year = {2018},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: Correlation between the onset of Alfvénic chirping (lower plots) and an improvement of thermal ion confinement, as inferred from TRANSP (upper plots), for NSTX pulses #128453 and #135388.

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Spontaneous hole-clump pair creation in weakly unstable plasmas
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Observation of Nonlinear Frequency-Sweeping Suppression with rf Diffusion
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Beta-dependence of energetic particle-driven instabilities in spherical tokamaks
journal, May 2004


Mitigation of Alfvén Activity in a Tokamak by Externally Applied Static 3D Fields
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Transport of Energetic Particles by Microturbulence in Magnetized Plasmas
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Electrostatic and magnetic transport of energetic ions in turbulent plasmas
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Toroidal mode structure in weak and reversed magnetic shear plasmas and its role in the internal transport barrier
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Alfvén eigenmode evolution computed with the VENUS and KINX codes for the ITER baseline scenario
journal, February 2017


Line broadened quasi-linear burst model [fusion plasma]
journal, December 1995


Advanced scenarios for ITER operation
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    Works referencing / citing this record:

    NSTX/NSTX-U theory, modeling and analysis results
    journal, June 2019


    Modeling of chirping toroidal Alfvén eigenmodes in NSTX
    journal, September 2019

    • White, R. B.; Duarte, V. N.; Gorelenkov, N. N.
    • Physics of Plasmas, Vol. 26, Issue 9
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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.