Three-dimensional equilibria and island energy transport due to resonant magnetic perturbation edge localized mode suppression on DIII-D
Abstract
In this research, we conducted experiments in the DIII-D tokamak that show that the plasma responds to resonant magnetic perturbations (RMPs) with toroidalmode numbers of n=2 and n=3 without field line reconnection, consistent with resistive magnetohydrodynamic predictions, while a strong nonlinear bifurcation is apparent when edge localized modes(ELMs) are suppressed. The magnetic response associated with this bifurcation is localized to the high field side of the machine and exhibits a dominant n=1 component despite the application of a constant amplitude, slowly toroidally rotating, n=2 applied field. The n=1 mode is born locked to the vacuum vessel wall, while the n=2 mode is entrained to the rotating field. Based on these magnetic response measurements and Thomson scattering measurements of flattening of the electron temperature profile, it is likely that these modes are magnetic island chains near the H-mode pedestal. The reduction in ∇Te occurs near the q=4 and 5 rational surfaces, suggesting five unique islands are possible (m=8, 9, or 10 for n=2) and (m=4 or 5 for n=1). In all cases, the island width is estimated to be 2–3 cm. The Chang-Callen calculated confinement degradation due to the presence of an individual island of this size is 8%–12%, which ismore »
- Authors:
-
- General Atomics, San Diego, CA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Princeton Univ., NJ (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Columbia Univ., New York, NY (United States)
- Culham Science Centre, Culham Centre for Fusion Energy (CCFE), Abingdon (United Kingdom)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); DIII-D National Fusion Facility, San Diego, CA (United States); General Atomics, San Diego, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1302918
- Alternate Identifier(s):
- OSTI ID: 1226106; OSTI ID: 1372465; OSTI ID: 1871408
- Report Number(s):
- LLNL-JRNL-834534
Journal ID: ISSN 1070-664X; AT1010101; ERAT363
- Grant/Contract Number:
- AC05-00OR22725; FC02-04ER54698; AC02-09CH11466; AC52-07NA27344; FG02-04ER54761
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 11; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Plasma confinement; Energy production, transmission and distribution; Plasma properties and parameters; Tokamaks; Plasma instabilities; Magnetohydrodynamics; Optical metrology; Computer programming; Plasma diagnostics; Wave mechanics
Citation Formats
King, J. D., Strait, E. J., Nazikian, R., Paz-Soldan, Carlos, Eldon, D., Fenstermacher, M. E., Ferraro, N. M., Hanson, J. M., Haskey, S. R., La Haye, R. J., Lanctot, Matthew J., Lazerson, Sam A., Logan, N. C., Liu, Y. Q., Okabayashi, M., Park, J. -K., and Turnbull, A. D. Three-dimensional equilibria and island energy transport due to resonant magnetic perturbation edge localized mode suppression on DIII-D. United States: N. p., 2015.
Web. doi:10.1063/1.4935486.
King, J. D., Strait, E. J., Nazikian, R., Paz-Soldan, Carlos, Eldon, D., Fenstermacher, M. E., Ferraro, N. M., Hanson, J. M., Haskey, S. R., La Haye, R. J., Lanctot, Matthew J., Lazerson, Sam A., Logan, N. C., Liu, Y. Q., Okabayashi, M., Park, J. -K., & Turnbull, A. D. Three-dimensional equilibria and island energy transport due to resonant magnetic perturbation edge localized mode suppression on DIII-D. United States. https://doi.org/10.1063/1.4935486
King, J. D., Strait, E. J., Nazikian, R., Paz-Soldan, Carlos, Eldon, D., Fenstermacher, M. E., Ferraro, N. M., Hanson, J. M., Haskey, S. R., La Haye, R. J., Lanctot, Matthew J., Lazerson, Sam A., Logan, N. C., Liu, Y. Q., Okabayashi, M., Park, J. -K., and Turnbull, A. D. Mon .
"Three-dimensional equilibria and island energy transport due to resonant magnetic perturbation edge localized mode suppression on DIII-D". United States. https://doi.org/10.1063/1.4935486. https://www.osti.gov/servlets/purl/1302918.
@article{osti_1302918,
title = {Three-dimensional equilibria and island energy transport due to resonant magnetic perturbation edge localized mode suppression on DIII-D},
author = {King, J. D. and Strait, E. J. and Nazikian, R. and Paz-Soldan, Carlos and Eldon, D. and Fenstermacher, M. E. and Ferraro, N. M. and Hanson, J. M. and Haskey, S. R. and La Haye, R. J. and Lanctot, Matthew J. and Lazerson, Sam A. and Logan, N. C. and Liu, Y. Q. and Okabayashi, M. and Park, J. -K. and Turnbull, A. D.},
abstractNote = {In this research, we conducted experiments in the DIII-D tokamak that show that the plasma responds to resonant magnetic perturbations (RMPs) with toroidalmode numbers of n=2 and n=3 without field line reconnection, consistent with resistive magnetohydrodynamic predictions, while a strong nonlinear bifurcation is apparent when edge localized modes(ELMs) are suppressed. The magnetic response associated with this bifurcation is localized to the high field side of the machine and exhibits a dominant n=1 component despite the application of a constant amplitude, slowly toroidally rotating, n=2 applied field. The n=1 mode is born locked to the vacuum vessel wall, while the n=2 mode is entrained to the rotating field. Based on these magnetic response measurements and Thomson scattering measurements of flattening of the electron temperature profile, it is likely that these modes are magnetic island chains near the H-mode pedestal. The reduction in ∇Te occurs near the q=4 and 5 rational surfaces, suggesting five unique islands are possible (m=8, 9, or 10 for n=2) and (m=4 or 5 for n=1). In all cases, the island width is estimated to be 2–3 cm. The Chang-Callen calculated confinement degradation due to the presence of an individual island of this size is 8%–12%, which is close to the 13%–14% measured between the ELMs and suppressed states. In conclusion, this suggests that edge tearing modes may alter the pedestal causing peeling-ballooning stability during RMP induced ELM suppression.},
doi = {10.1063/1.4935486},
journal = {Physics of Plasmas},
number = 11,
volume = 22,
place = {United States},
year = {Mon Nov 16 00:00:00 EST 2015},
month = {Mon Nov 16 00:00:00 EST 2015}
}
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