Energies 2010, 3(3), 277-284; doi:10.3390/en3030277
Article

The DEMO Quasisymmetric Stellarator

Received: 12 January 2010; Accepted: 1 February 2010 / Published: 26 February 2010
(This article belongs to the Special Issue Nuclear Fusion)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: 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.
Keywords: computational science; magnetic fusion; plasma physics
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MDPI and ACS Style

Garabedian, P.R.; McFadden, G.B. The DEMO Quasisymmetric Stellarator. Energies 2010, 3, 277-284.

AMA Style

Garabedian PR, McFadden GB. The DEMO Quasisymmetric Stellarator. Energies. 2010; 3(3):277-284.

Chicago/Turabian Style

Garabedian, Paul R.; McFadden, Geoffrey B. 2010. "The DEMO Quasisymmetric Stellarator." Energies 3, no. 3: 277-284.

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