Experimental tests of linear and nonlinear three-dimensional equilibrium models in DIII-D
Abstract
DIII-D experiments using new detailed magnetic diagnostics show that linear, ideal magnetohydrodynamics(MHD) theory quantitatively describes the magnetic structure (as measured externally) of three-dimensional (3D) equilibria resulting from applied fields with toroidalmode number n = 1, while a nonlinear solution to ideal MHD force balance, using the VMEC code, requires the inclusion of n ≥ 1 to achieve similar agreement. These tests are carried out near ITER baseline parameters, providing a validated basis on which to exploit 3D fields for plasma control development. Scans of the applied poloidal spectrum and edge safety factor confirm that low-pressure, n = 1 non-axisymmetric tokamak equilibria are determined by a single, dominant, stable eigenmode. However, at higher beta, near the ideal kinkmode stability limit in the absence of a conducting wall, the qualitative features of the 3D structure are observed to vary in a way that is not captured by ideal MHD.
- Authors:
-
[3];
[2]
- Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)
- General Atomics, San Diego, CA (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Australian National Univ., Canberra, ACT (Australia)
- Columbia Univ., New York, NY (United States)
- Culham Science Centre, Abingdon (United Kingdom). Plasma Research Lab.
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States). DIII-D National Fusion Facility (DIII-D)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- OSTI Identifier:
- 1295127
- Alternate Identifier(s):
- OSTI ID: 1228332; OSTI ID: 1254754; OSTI ID: 1459669
- Grant/Contract Number:
- AC05-00OR22725; FC02-04ER54698; AC05-06OR23100; AC02-09CH11466; FG02-04ER54761; AC05-00OR22725.; AC05-00OR23100; FC02-04ER5469
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 7; 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; Equilibrium; MHD - Toroidal; Magnetics; Tokamaks
Citation Formats
King, Josh D., Strait, Edward J., Lazerson, Samuel A., Ferraro, Nathaniel M., Logan, Nikolas C., Haskey, Shaun R., Park, Jong -Kyu, Hanson, Jeremy M., Lanctot, Matthew J., Liu, Yueqiang, Nazikian, Raffi, Okabayashi, Michio, Paz-Soldan, Carlos A., Shiraki, Daisuke, and Turnbull, Alan D. Experimental tests of linear and nonlinear three-dimensional equilibrium models in DIII-D. United States: N. p., 2015.
Web. doi:10.1063/1.4923017.
King, Josh D., Strait, Edward J., Lazerson, Samuel A., Ferraro, Nathaniel M., Logan, Nikolas C., Haskey, Shaun R., Park, Jong -Kyu, Hanson, Jeremy M., Lanctot, Matthew J., Liu, Yueqiang, Nazikian, Raffi, Okabayashi, Michio, Paz-Soldan, Carlos A., Shiraki, Daisuke, & Turnbull, Alan D. Experimental tests of linear and nonlinear three-dimensional equilibrium models in DIII-D. United States. https://doi.org/10.1063/1.4923017
King, Josh D., Strait, Edward J., Lazerson, Samuel A., Ferraro, Nathaniel M., Logan, Nikolas C., Haskey, Shaun R., Park, Jong -Kyu, Hanson, Jeremy M., Lanctot, Matthew J., Liu, Yueqiang, Nazikian, Raffi, Okabayashi, Michio, Paz-Soldan, Carlos A., Shiraki, Daisuke, and Turnbull, Alan D. Wed .
"Experimental tests of linear and nonlinear three-dimensional equilibrium models in DIII-D". United States. https://doi.org/10.1063/1.4923017. https://www.osti.gov/servlets/purl/1295127.
@article{osti_1295127,
title = {Experimental tests of linear and nonlinear three-dimensional equilibrium models in DIII-D},
author = {King, Josh D. and Strait, Edward J. and Lazerson, Samuel A. and Ferraro, Nathaniel M. and Logan, Nikolas C. and Haskey, Shaun R. and Park, Jong -Kyu and Hanson, Jeremy M. and Lanctot, Matthew J. and Liu, Yueqiang and Nazikian, Raffi and Okabayashi, Michio and Paz-Soldan, Carlos A. and Shiraki, Daisuke and Turnbull, Alan D.},
abstractNote = {DIII-D experiments using new detailed magnetic diagnostics show that linear, ideal magnetohydrodynamics(MHD) theory quantitatively describes the magnetic structure (as measured externally) of three-dimensional (3D) equilibria resulting from applied fields with toroidalmode number n = 1, while a nonlinear solution to ideal MHD force balance, using the VMEC code, requires the inclusion of n ≥ 1 to achieve similar agreement. These tests are carried out near ITER baseline parameters, providing a validated basis on which to exploit 3D fields for plasma control development. Scans of the applied poloidal spectrum and edge safety factor confirm that low-pressure, n = 1 non-axisymmetric tokamak equilibria are determined by a single, dominant, stable eigenmode. However, at higher beta, near the ideal kinkmode stability limit in the absence of a conducting wall, the qualitative features of the 3D structure are observed to vary in a way that is not captured by ideal MHD.},
doi = {10.1063/1.4923017},
journal = {Physics of Plasmas},
number = 7,
volume = 22,
place = {United States},
year = {Wed Jul 01 00:00:00 EDT 2015},
month = {Wed Jul 01 00:00:00 EDT 2015}
}
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