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Title: Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D

Abstract

Here, recent experiments on DIII-D have increased confidence in the ability to suppress edge-localized modes (ELMs) using edge-resonant magnetic perturbations (RMPs) in ITER, including an improved physics basis for the edge response to RMPs as well as expansion of RMP ELM suppression to more ITER-like conditions. Complete ELM suppression has been achieved utilizing n = 3 RMPs in the ITER baseline scenario. In addition, RMP ELM suppression has been expanded to include plasmas with helium concentrations near 25% and the use of n = 2 RMPs. Analysis of the kinetic profile response suggests that ELM suppression is correlated with the co-alignment of the ω ⊥e = 0 location, an n = 3 rational surface, and the top of the pedestal. Modelling predicts that such a co-alignment could potentially lead to island (or island chain) formation just inside the top of the pedestal, inhibiting the growth of the pedestal and thereby maintaining the ELM-free state. Detailed analysis of data obtained during toroidal phase variations of the applied n = 3 RMPs have provided further evidence of an island-like structure at the top of the pedestal. In addition, nearly matched discharges with co-neutral-beam-injection (co-NBI) and counter-NBI have demonstrated the importance of themore » presence of the ω ⊥e = 0 location for ELM suppression. In the counter-NBI cases, the toroidal rotation profile is such that there is no ω ⊥e = 0 location and ELMs are not suppressed in conditions in which ELM suppression is generally observed with co-NBI.« less

Authors:
 [1];  [2];  [1];  [1];  [1];  [3];  [3];  [1];  [4];  [1];  [1];  [5];  [1];  [6];  [2];  [1];  [7];  [6];  [6];  [8]
  1. General Atomics, San Diego, CA (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Univ. of California San Diego, La Jolla, CA (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Univ. of Wisconsin, Madison, WI (United States)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. IPP-Garching, Garching (Germany)
  8. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1260806
Alternate Identifier(s):
OSTI ID: 1351086
Grant/Contract Number:  
AC02-09CH11466; AC05-00O422725; AC52-07NA27344; FC02-04ER54698; FG02-07ER54917; FG02-08ER35984; FG02-89ER53296
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 55; Journal Issue: 2; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DIII-D; resonant magnetic perturbation; ELM control; MHD plasma response; non-axisymmetric fields

Citation Formats

Wade, M. R., Nazikian, R., deGrassie, J. S., Evans, T. E., Ferraro, N. M., Moyer, R. A., Orlov, D. M., Buttery, R. J., Fenstermacher, M. E., Garofalo, A. M., Lanctot, M. A., McKee, G. R., Osborne, T. H., Shafer, M. A., Solomon, W. M., Snyder, P. B., Suttrop, W., Wingen, A., Unterberg, E. A., and Zeng, L. Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D. United States: N. p., 2015. Web. doi:10.1088/0029-5515/55/2/023002.
Wade, M. R., Nazikian, R., deGrassie, J. S., Evans, T. E., Ferraro, N. M., Moyer, R. A., Orlov, D. M., Buttery, R. J., Fenstermacher, M. E., Garofalo, A. M., Lanctot, M. A., McKee, G. R., Osborne, T. H., Shafer, M. A., Solomon, W. M., Snyder, P. B., Suttrop, W., Wingen, A., Unterberg, E. A., & Zeng, L. Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D. United States. doi:10.1088/0029-5515/55/2/023002.
Wade, M. R., Nazikian, R., deGrassie, J. S., Evans, T. E., Ferraro, N. M., Moyer, R. A., Orlov, D. M., Buttery, R. J., Fenstermacher, M. E., Garofalo, A. M., Lanctot, M. A., McKee, G. R., Osborne, T. H., Shafer, M. A., Solomon, W. M., Snyder, P. B., Suttrop, W., Wingen, A., Unterberg, E. A., and Zeng, L. Wed . "Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D". United States. doi:10.1088/0029-5515/55/2/023002. https://www.osti.gov/servlets/purl/1260806.
@article{osti_1260806,
title = {Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D},
author = {Wade, M. R. and Nazikian, R. and deGrassie, J. S. and Evans, T. E. and Ferraro, N. M. and Moyer, R. A. and Orlov, D. M. and Buttery, R. J. and Fenstermacher, M. E. and Garofalo, A. M. and Lanctot, M. A. and McKee, G. R. and Osborne, T. H. and Shafer, M. A. and Solomon, W. M. and Snyder, P. B. and Suttrop, W. and Wingen, A. and Unterberg, E. A. and Zeng, L.},
abstractNote = {Here, recent experiments on DIII-D have increased confidence in the ability to suppress edge-localized modes (ELMs) using edge-resonant magnetic perturbations (RMPs) in ITER, including an improved physics basis for the edge response to RMPs as well as expansion of RMP ELM suppression to more ITER-like conditions. Complete ELM suppression has been achieved utilizing n = 3 RMPs in the ITER baseline scenario. In addition, RMP ELM suppression has been expanded to include plasmas with helium concentrations near 25% and the use of n = 2 RMPs. Analysis of the kinetic profile response suggests that ELM suppression is correlated with the co-alignment of the ω⊥e = 0 location, an n = 3 rational surface, and the top of the pedestal. Modelling predicts that such a co-alignment could potentially lead to island (or island chain) formation just inside the top of the pedestal, inhibiting the growth of the pedestal and thereby maintaining the ELM-free state. Detailed analysis of data obtained during toroidal phase variations of the applied n = 3 RMPs have provided further evidence of an island-like structure at the top of the pedestal. In addition, nearly matched discharges with co-neutral-beam-injection (co-NBI) and counter-NBI have demonstrated the importance of the presence of the ω⊥e = 0 location for ELM suppression. In the counter-NBI cases, the toroidal rotation profile is such that there is no ω⊥e = 0 location and ELMs are not suppressed in conditions in which ELM suppression is generally observed with co-NBI.},
doi = {10.1088/0029-5515/55/2/023002},
journal = {Nuclear Fusion},
number = 2,
volume = 55,
place = {United States},
year = {2015},
month = {1}
}

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