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Schlossberg DJ, Bodner GM, Bongard MW, Burke MG, Fonck RJ, Perry JM, Reusch JA. Noninductively Driven Tokamak Plasmas at Near-Unity Toroidal Beta. PHYSICAL REVIEW LETTERS 2017; 119:035001. [PMID: 28777627 DOI: 10.1103/physrevlett.119.035001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2017] [Indexed: 06/07/2023]
Abstract
Access to and characterization of sustained, toroidally confined plasmas with a very high plasma-to-magnetic pressure ratio (β_{t}), low internal inductance, high elongation, and nonsolenoidal current drive is a central goal of present tokamak plasma research. Stable access to this desirable parameter space is demonstrated in plasmas with ultralow aspect ratio and high elongation. Local helicity injection provides nonsolenoidal sustainment, low internal inductance, and ion heating. Equilibrium analyses indicate β_{t} up to ∼100% with a minimum |B| well spanning up to ∼50% of the plasma volume.
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Affiliation(s)
- D J Schlossberg
- Department of Engineering Physics, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706, USA
| | - G M Bodner
- Department of Engineering Physics, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706, USA
| | - M W Bongard
- Department of Engineering Physics, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706, USA
| | - M G Burke
- Department of Engineering Physics, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706, USA
| | - R J Fonck
- Department of Engineering Physics, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706, USA
| | - J M Perry
- Department of Engineering Physics, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706, USA
| | - J A Reusch
- Department of Engineering Physics, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706, USA
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Affiliation(s)
- C. M. Greenfield
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
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Turnbull AD, Brennan DP, Chu MS, Lao LL, Snyder PB. Theory and Simulation Basis for Magnetohydrodynamic Stability in DIII-D. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst05-a1046] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- A. D. Turnbull
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | - D. P. Brennan
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | - M. S. Chu
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | - L. L. Lao
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | - P. B. Snyder
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
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Strait EJ, Fredrickson ED, Moret JM, Takechi M. Chapter 2: Magnetic Diagnostics. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst08-a1674] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- E. J. Strait
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608
| | | | - J.-M. Moret
- CRPP-EPFL, Centre de Recherches en Physique des Plasmas Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, Switzerland
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Abstract
The NSTAB equilibrium and stability code and the TRAN Monte Carlo transport code furnish a simple but effective numerical simulation of essential features of present tokamak and stellarator experiments. When the mesh size is comparable to the island width, an accurate radial difference scheme in conservation form captures magnetic islands successfully despite a nested surface hypothesis imposed by the mathematics. Three-dimensional asymmetries in bifurcated numerical solutions of the axially symmetric tokamak problem are relevant to the observation of unstable neoclassical tearing modes and edge localized modes in experiments. Islands in compact stellarators with quasiaxial symmetry are easier to control, so these configurations will become good candidates for magnetic fusion if difficulties with safety and stability are encountered in the International Thermonuclear Experimental Reactor (ITER) project.
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Garabedian PR. Three-dimensional equilibria in axially symmetric tokamaks. Proc Natl Acad Sci U S A 2006; 103:19232-6. [PMID: 17159158 PMCID: PMC1748209 DOI: 10.1073/pnas.0609569103] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The NSTAB and TRAN computer codes have been developed to study equilibrium, stability, and transport in fusion plasmas with three-dimensional (3D) geometry. The numerical method that is applied calculates islands in tokamaks like the Doublet III-D at General Atomic and the International Thermonuclear Experimental Reactor. When bifurcated 3D solutions are used in Monte Carlo computations of the energy confinement time, a realistic simulation of transport is obtained. The significance of finding many 3D magnetohydrodynamic equilibria in axially symmetric tokamaks needs attention because their cumulative effect may contribute to the prompt loss of alpha particles or to crashes and disruptions that are observed. The 3D theory predicts good performance for stellarators.
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Affiliation(s)
- Paul R Garabedian
- Courant Institute of Mathematical Sciences, New York University, New York, NY 10012, USA.
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Kellman AG. Advanced Control Techniques and High Performance Discharges on DIII-D. FUSION SCIENCE AND TECHNOLOGY 2005. [DOI: 10.13182/fst05-a715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- A. G. Kellman
- General Atomics, P.O. Box 85608, San Diego California 92186–5608
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Hender T, Bond A, Edwards J, Karditsas P, McClements K, Mustoe J, Sherwood D, Voss G, Wilson H. Spherical tokamak power plant design issues. FUSION ENGINEERING AND DESIGN 2000. [DOI: 10.1016/s0920-3796(00)00169-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Cheng E, Peng Y, Cerbone R, Fogarty P, Galambos JD, Mogahed E, Nelson B, Simnad M, Sviatoslavsky I, Tillack M. Study of a spherical tokamak based volumetric neutron source. FUSION ENGINEERING AND DESIGN 1998. [DOI: 10.1016/s0920-3796(97)00096-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Mazzucato E, Batha SH, Beer M, Bell M, Bell RE, Budny RV, Bush C, Hahm TS, Hammett GW, Levinton FM, Nazikian R, Park H, Rewoldt G, Schmidt GL, Synakowski EJ, Tang WM, Taylor G, Zarnstorff MC. Turbulent Fluctuations in TFTR Configurations with Reversed Magnetic Shear. PHYSICAL REVIEW LETTERS 1996; 77:3145-3148. [PMID: 10062145 DOI: 10.1103/physrevlett.77.3145] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Strait EJ, Lao LL, Mauel ME, Rice BW, Taylor TS, Burrell KH, Chu MS, Lazarus EA, Osborne TH, Thompson SJ, Turnbull AD. Enhanced confinement and stability in DIII-D discharges with reversed magnetic shear. PHYSICAL REVIEW LETTERS 1995; 75:4421-4424. [PMID: 10059904 DOI: 10.1103/physrevlett.75.4421] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Levinton FM, Zarnstorff MC, Batha SH, Bell M, Bell RE, Budny RV, Bush C, Chang Z, Fredrickson E, Janos A, Manickam J, Ramsey A, Sabbagh SA, Schmidt GL, Synakowski EJ, Taylor G. Improved confinement with reversed magnetic shear in TFTR. PHYSICAL REVIEW LETTERS 1995; 75:4417-4420. [PMID: 10059903 DOI: 10.1103/physrevlett.75.4417] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Turnbull AD, Taylor TS, Lin-Liu YR. High Beta and Enhanced Confinement in a Second Stable Core VH-Mode Advanced Tokamak. PHYSICAL REVIEW LETTERS 1995; 74:718-721. [PMID: 10058830 DOI: 10.1103/physrevlett.74.718] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Simonen T, Jackson G, Lazarus E, Mahdavi M, Petrie T, Politzer P, Taylor T, The DIII-D Team. Recent DIII-D high power heating and current drive experiments. FUSION ENGINEERING AND DESIGN 1995. [DOI: 10.1016/0920-3796(94)00166-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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