Journal ArticleDOI
Reconstruction of current profile parameters and plasma shapes in tokamaks
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TLDR
In this paper, an efficient method is given to reconstruct the current profile parameters, the plasma shape, and a current profile consistent with the magnetohydrodynamic equilibrium constraint from external magnetic measurements, based on a Picard iteration approach.Abstract:
An efficient method is given to reconstruct the current profile parameters, the plasma shape, and a current profile consistent with the magnetohydrodynamic equilibrium constraint from external magnetic measurements, based on a Picard iteration approach which approximately conserves the measurements. Computational efforts are reduced by parametrizing the current profile linearly in terms of a number of physical parameters. Results of detailed comparative calculations and a sensitivity study are described. Illustrative calculations to reconstruct the current profiles and plasma shapes in ohmically and auxiliarily heated Doublet III plasmas are given which show many interesting features of the current profiles.read more
Citations
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Journal ArticleDOI
Gyrokinetic projection of the divertor heat-flux width from present tokamaks to ITER
Choong-Seock Chang,Seung-Hoe Ku,A. Loarte,V. Parail,F. Köchl,M. Romanelli,Rajesh Maingi,Joon-Wook Ahn,T.K. Gray,J. W. Hughes,Brian LaBombard,T. Leonard,M. A. Makowski,J. L. Terry +13 more
TL;DR: In this paper, the authors used the XGC1 edge gyrokinetic code for a high fidelity prediction for the width of the heat-flux to divertor plates in attached plasma condition.
Journal ArticleDOI
Particle distribution modification by low amplitude modes
TL;DR: In this article, the effects of pitch angle scattering and drag on a DIII-D deuterium beam distribution in the presence of low amplitude experimentally validated Toroidal Alfven and reversed shear Alfven eigenmodes are examined in detail.
Journal ArticleDOI
Theory of perturbed equilibria for solving the Grad–Shafranov equation
L. E. Zakharov,A. Pletzer +1 more
TL;DR: The theory of perturbed magnetohydrodynamic equilibria for different formulations of the tokamak equilibrium problem is presented in this article for numerical codes, and an explicit Newton scheme for solving the Grad-Shafranov equation subject to different constraints.
Journal ArticleDOI
Diagnostic systems on alcator C-mod
N. P. Basse,A. Dominguez,E.M. Edlund,C.L. Fiore,Robert Granetz,Amanda Hubbard,Jerry Hughes,Ian H. Hutchinson,J. H. Irby,Brian LaBombard,L. Lin,Yu-Ming Lin,Bruce Lipschultz,J. Liptac,E. S. Marmar,D. A. Mossessian,R.R. Parker,Miklos Porkolab,J.E. Rice,J. A. Snipes,Vincent Tang,J.L. Terry,S.M. Wolfe,S.J. Wukitch,K. Zhurovich,R. V. Bravenec,P. E. Phillips,W. L. Rowan,G. J. Kramer,G. Schilling,S. D. Scott,Stewart Zweben +31 more
TL;DR: An overview of the diagnostics installed on the Alcator C-Mod tokamak is presented in this article, where several advanced and novel diagnostics contribute to the investigation of C-mod plasmas, e.g., electron cyclotron emission, phase contrast imaging, gas puff imaging, probe measurements, and active magnetohydrodynamic antennas.
Journal ArticleDOI
Understanding disruptions in tokamaksa)
TL;DR: In this paper, the effect of plasma current sharing with the wall was introduced into theory, and the toroidal asymmetry of the plasma current measurements during vertical disruption event (VDE) on the Joint European Torus was explained.
References
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Journal ArticleDOI
Separation of β̄p and ℓi in tokamaks of non-circular cross-section
TL;DR: In this paper, integral relations for the average poloidal beta p and the plasma internal inductance li are derived from the magnetohydrodynamic (MHD) equilibrium equation for an axisymmetric torus.
Journal ArticleDOI
Computation of ideal MHD equilibria
TL;DR: In this paper, a review of two-and three-dimensional ideal MHD equilibrium codes, with particular emphasis on axisymmetric toroidal calculations, is presented. But this paper is restricted to the case of Tokyoamak geometry.
Journal ArticleDOI
An efficient technique for magnetic analysis of non-circular, high-beta tokamak equilibria
D.W. Swain,G.H. Neilson +1 more
TL;DR: In this paper, a method for determining plasma shape and global properties of high-beta non-circular tokamak equilibria (βp, β, q and li) from magnetic sensor data is described.
Journal ArticleDOI
Magnetic analysis of non-circular cross-section tokamaks
J.L. Luxon,B.B. Brown +1 more
TL;DR: In this paper, the MHD equilibrium configuration for circular and non-circular plasmas from measurements of the magnetic field and flux made outside the discharge was determined using least squares minimization techniques.
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