Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D
Abstract
We report 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 »
- Authors:
-
- General Atomics, San Diego, CA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Univ. of California, San Diego, CA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of Wisconsin, Madison, WI (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Max-Planck-Institut fur Plasmaphysik, Garching (Germany). IPP-Garching
- Univ. of California, Los Angeles, CA (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1265638
- Alternate Identifier(s):
- OSTI ID: 1260806; OSTI ID: 1351086; OSTI ID: 1871390
- Report Number(s):
- LLNL-JRNL-834461; GA-A27695
Journal ID: ISSN 0029-5515
- Grant/Contract Number:
- AC05-00OR22725; AC02-09CH11466; AC52-07NA27344; FC02-04ER54698; FG02-07ER54917; FG02-08ER54984; FG02-89ER53296; FG02-08ER54999
- Resource Type:
- Journal Article: 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, John S., Evans, T. E., Ferraro, N. M., Moyer, R. A., Orlov, D. M., Buttery, R. J., Fenstermacher, Max E., Garofalo, Andrea M., Lanctot, M. A., McKee, George R., Osborne, T. H., Shafer, M. A., Solomon, W. M., Snyder, P. B., Suttrop, Wolfgang, Wingen, Andreas, Unterberg, Ezekial 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, John S., Evans, T. E., Ferraro, N. M., Moyer, R. A., Orlov, D. M., Buttery, R. J., Fenstermacher, Max E., Garofalo, Andrea M., Lanctot, M. A., McKee, George R., Osborne, T. H., Shafer, M. A., Solomon, W. M., Snyder, P. B., Suttrop, Wolfgang, Wingen, Andreas, Unterberg, Ezekial A., & Zeng, L. Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D. United States. https://doi.org/10.1088/0029-5515/55/2/023002
Wade, M. R., Nazikian, R., deGrassie, John S., Evans, T. E., Ferraro, N. M., Moyer, R. A., Orlov, D. M., Buttery, R. J., Fenstermacher, Max E., Garofalo, Andrea M., Lanctot, M. A., McKee, George R., Osborne, T. H., Shafer, M. A., Solomon, W. M., Snyder, P. B., Suttrop, Wolfgang, Wingen, Andreas, Unterberg, Ezekial A., and Zeng, L. 2015.
"Advances in the physics understanding of ELM suppression using resonant magnetic perturbations in DIII-D". United States. https://doi.org/10.1088/0029-5515/55/2/023002. https://www.osti.gov/servlets/purl/1265638.
@article{osti_1265638,
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, John S. and Evans, T. E. and Ferraro, N. M. and Moyer, R. A. and Orlov, D. M. and Buttery, R. J. and Fenstermacher, Max E. and Garofalo, Andrea M. and Lanctot, M. A. and McKee, George R. and Osborne, T. H. and Shafer, M. A. and Solomon, W. M. and Snyder, P. B. and Suttrop, Wolfgang and Wingen, Andreas and Unterberg, Ezekial A. and Zeng, L.},
abstractNote = {We report 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},
url = {https://www.osti.gov/biblio/1265638},
journal = {Nuclear Fusion},
issn = {0029-5515},
number = 2,
volume = 55,
place = {United States},
year = {Wed Jan 14 00:00:00 EST 2015},
month = {Wed Jan 14 00:00:00 EST 2015}
}
Web of Science
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