Compact Torsatron configurations

Carreras, B. A.; Domínguez, N.; García, L.; Lynch, V. E.; Lyon, J. F.; Cary, J. R.; Hanson, Jim; Navarro, Albert

doi:10.2172/5972987

Cited by 4 publications

(2 citation statements)

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“…where V p (s) is the plasma volume within the flux surface labelled s: When a finite plasma pressure is introduced, the expression is modified into [61]: Moreover, the magnetic well term as defined in Mercier stability criterion is [64,65]:…”

Section: Ideal-mhd Stabilitymentioning

confidence: 99%

Physics-regularized neural network of the ideal-MHD solution operator in Wendelstein 7-X configurations

et al. 2023

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The computational cost of constructing 3D magnetohydrodynamic (MHD) equilibria is one of the limiting factors in stellarator research and design. Although data-driven approaches have been proposed to provide fast 3D MHD equilibria, the accuracy with which equilibrium properties are reconstructed is unknown. In this work, we describe an artificial neural network (NN) that quickly approximates the ideal-MHD solution operator in Wendelstein 7-X (W7-X) configurations. This model fulfils equilibrium symmetries by construction. The MHD force residual regularizes the solution of the NN to satisfy the ideal-MHD equations. The model predicts the equilibrium solution with high accuracy, and it faithfully reconstructs global equilibrium quantities and proxy functions used in stellarator optimization. We also optimize W7-X magnetic configurations, where desiderable configurations can be found in terms of fast particle confinement. This work demonstrates with which accuracy NN models can approximate the 3D ideal-MHD solution operator and reconstruct equilibrium properties of interest, and it suggests how they might be used to optimize stellarator magnetic configurations.

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Section: Ideal-mhd Stabilitymentioning

confidence: 99%

Physics-regularized neural network of the ideal-MHD solution operator in Wendelstein 7-X configurations

et al. 2023

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“…The problem is more severe in a device of small aspect ratio because of its larger loss cone region, although it is superior from an economical point of view. 2 The plasma potential is a key physics quantity affecting the loss cone structure by giving EϫB rotation to helically trapped particles.…”

Section: Introductionmentioning

confidence: 99%

Direct observation of potential profiles with a 200 keV heavy ion beam probe on the Compact Helical System

et al. 1997

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In this paper we present space potential profiles directly observed in a toroidal helical plasma of the Compact Helical System ͑CHS͒ ͓K. Matsuoka et al., Proceedings, 12th International Conference on Plasma Physics and Controlled Nuclear Fusion, Nice, 1988 ͑International Atomic Energy Agency, Vienna, 1989͒, Vol. 2, p. 411͔, using a 200 keV heavy ion beam probe. The potential profiles exhibit widely varied characteristics, including positive and negative polarities for electron cyclotron and neutral beam-heated plasmas, respectively. The behavior of high-energy particles in the CHS plasmas are deduced from loss cone diagrams evaluated from the observed potential profiles.

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Ideal magnetohydrodynamic theory for localized interchange modes in toroidal anisotropic plasmas

et al. 2016

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Ideal magnetohydrodynamic theory for localized interchange modes is developed for toroidal plasmas with anisotropic pressure. The work extends the existing theories of Johnson and Hastie [Phys. Fluids 31, 1609 (1988)], etc., to the low n mode case, where n is the toroidal mode number. Also, the plasma compressibility is included, so that the coupling of the parallel motion to perpendicular one, i.e., the so-called apparent mass effect, is investigated in the anisotropic pressure case. The singular layer equation is obtained, and the generalized Mercier's criterion is derived.

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Compact Torsatron configurations

Cited by 4 publications

References 0 publications

Physics-regularized neural network of the ideal-MHD solution operator in Wendelstein 7-X configurations

Physics-regularized neural network of the ideal-MHD solution operator in Wendelstein 7-X configurations

Direct observation of potential profiles with a 200 keV heavy ion beam probe on the Compact Helical System

Ideal magnetohydrodynamic theory for localized interchange modes in toroidal anisotropic plasmas

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