The DEMO Quasisymmetric Stellarator
The NSTAB nonlinear stability code solves differential equations in conservation form, and the TRAN Monte Carlo test particle code tracks guiding center orbits in a fixed background, to provide simulations of equilibrium, stability, and transport in tokamaks and stellarators. These codes are well co...
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| Format: | Article |
| Language: | English |
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MDPI AG
2010-02-01
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| Series: | Energies |
| Subjects: | |
| Online Access: | http://www.mdpi.com/1996-1073/3/3/277/ |
| _version_ | 1828153446134448128 |
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| author | Geoffrey B. McFadden Paul R. Garabedian |
| author_facet | Geoffrey B. McFadden Paul R. Garabedian |
| author_sort | Geoffrey B. McFadden |
| collection | DOAJ |
| description | The NSTAB nonlinear stability code solves differential equations in conservation form, and the TRAN Monte Carlo test particle code tracks guiding center orbits in a fixed background, to provide simulations of equilibrium, stability, and transport in tokamaks and stellarators. These codes are well correlated with experimental observations and have been validated by convergence studies. Bifurcated 3D solutions of the 2D tokamak problem have been calculated that model persistent disruptions, neoclassical tearing modes (NTMs) and edge localized modes (ELMs) occurring in the International Thermonuclear Experimental Reactor (ITER), which does not pass the NSTAB simulation test for nonlinear stability. So we have designed a quasiaxially symmetric (QAS) stellarator with similar proportions as a candidate for the demonstration (DEMO) fusion reactor that does pass the test [1]. The configuration has two field periods and an exceptionally accurate 2D symmetry that furnishes excellent thermal confinement and good control of the prompt loss of alpha particles. Robust coils are found from a filtered form of the Biot-Savart law based on a distribution of current over a control surface for the coils and the current in the plasma defined by the equilibrium calculation. Computational science has addressed the issues of equilibrium, stability, and transport, so it remains to develop an effective plan to construct the coils and build a diverter. |
| first_indexed | 2024-04-11T22:25:15Z |
| format | Article |
| id | doaj.art-0a55021cb9b446dfb86acfd78d91c3b9 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T22:25:15Z |
| publishDate | 2010-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-0a55021cb9b446dfb86acfd78d91c3b92022-12-22T03:59:43ZengMDPI AGEnergies1996-10732010-02-013327728410.3390/en3030277The DEMO Quasisymmetric StellaratorGeoffrey B. McFaddenPaul R. GarabedianThe NSTAB nonlinear stability code solves differential equations in conservation form, and the TRAN Monte Carlo test particle code tracks guiding center orbits in a fixed background, to provide simulations of equilibrium, stability, and transport in tokamaks and stellarators. These codes are well correlated with experimental observations and have been validated by convergence studies. Bifurcated 3D solutions of the 2D tokamak problem have been calculated that model persistent disruptions, neoclassical tearing modes (NTMs) and edge localized modes (ELMs) occurring in the International Thermonuclear Experimental Reactor (ITER), which does not pass the NSTAB simulation test for nonlinear stability. So we have designed a quasiaxially symmetric (QAS) stellarator with similar proportions as a candidate for the demonstration (DEMO) fusion reactor that does pass the test [1]. The configuration has two field periods and an exceptionally accurate 2D symmetry that furnishes excellent thermal confinement and good control of the prompt loss of alpha particles. Robust coils are found from a filtered form of the Biot-Savart law based on a distribution of current over a control surface for the coils and the current in the plasma defined by the equilibrium calculation. Computational science has addressed the issues of equilibrium, stability, and transport, so it remains to develop an effective plan to construct the coils and build a diverter.http://www.mdpi.com/1996-1073/3/3/277/computational sciencemagnetic fusionplasma physics |
| spellingShingle | Geoffrey B. McFadden Paul R. Garabedian The DEMO Quasisymmetric Stellarator Energies computational science magnetic fusion plasma physics |
| title | The DEMO Quasisymmetric Stellarator |
| title_full | The DEMO Quasisymmetric Stellarator |
| title_fullStr | The DEMO Quasisymmetric Stellarator |
| title_full_unstemmed | The DEMO Quasisymmetric Stellarator |
| title_short | The DEMO Quasisymmetric Stellarator |
| title_sort | demo quasisymmetric stellarator |
| topic | computational science magnetic fusion plasma physics |
| url | http://www.mdpi.com/1996-1073/3/3/277/ |
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