Experimental tests of linear and nonlinear three-dimensional equilibrium models in DIII-D

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.

doi:10.1063/1.4923017

Title: Experimental tests of linear and nonlinear three-dimensional equilibrium models in DIII-D

Journal Article · Wed Jul 01 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4923017· OSTI ID:1295127

King, Josh D. ^[1]; Strait, Edward J. ^[2];

^[3]; Ferraro, Nathaniel M. ^[2]; Logan, Nikolas C. ^[3]; Haskey, Shaun R. ^[4]; Park, Jong -Kyu ^[3]; Hanson, Jeremy M. ^[5]; Lanctot, Matthew J. ^[2]; Liu, Yueqiang ^[6]; Nazikian, Raffi ^[3]; Okabayashi, Michio ^[3]; Paz-Soldan, Carlos A. ^[2]; Shiraki, Daisuke ^[7];

^[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)

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.

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Research Organization:: 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 Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC05-00OR22725; FC02-04ER54698; AC05-06OR23100; AC02-09CH11466; FG02-04ER54761; AC05-00OR22725.; AC05-00OR23100; FC02-04ER5469

OSTI ID:: 1295127

Alternate ID(s):: OSTI ID: 1228332; OSTI ID: 1254754; OSTI ID: 1459669

Journal Information:: Physics of Plasmas, Vol. 22, Issue 7; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 38 works

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