Journal ArticleDOI
Reconstruction of current profile parameters and plasma shapes in tokamaks
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
Equilibrium analysis of current profiles in tokamaks
TL;DR: In this paper, an efficient method is given for self-consistent reconstruction of the tokamak current profiles and their associated magnetic topology using the magnetohydrodynamic (MHD) equilibrium constraint from external magnetic measurements, kinetic profile measurements, internal poloidal magnetic field measurements, and topological information from soft X-ray (SXR) measurements.
Journal ArticleDOI
First results from Alcator‐C‐MOD*
Ian H. Hutchinson,R. L. Boivin,F. Bombarda,Paul Bonoli,S. Fairfax,C.L. Fiore,John Goetz,S. Golovato,Robert Granetz,Martin Greenwald,S. Horne,Amanda Hubbard,J. H. Irby,Brian LaBombard,Bruce Lipschultz,E.S. Marmar,G.M. McCracken,M. Porkolab,J. E. Rice,J. A. Snipes,Yuichi Takase,J. L. Terry,S.M. Wolfe,C. Christensen,D. T. Garnier,M. Graf,T. Hsu,T. Luke,Mark May,A. Niemczewski,G. Tinios,J. Schachter,J. Urbahn +32 more
TL;DR: Early operation of the Alcator C-MOD tokamak [I.H. Hutchinson et al., 1990] is surveyed and the edge plasma shows a wealth of marfe-like phenomena, including a transition to detachment from the divertor plates with accompanying radiative divertor regions.
Journal ArticleDOI
Numerical studies of edge localized instabilities in tokamaks
TL;DR: In this paper, a new computational tool, edge localized instabilities in tokamaks equilibria (ELITE), has been developed to help our understanding of short wavelength instabilities close to the edge of tokak plasmas.
Journal ArticleDOI
Transport by intermittent convection in the boundary of the DIII-D tokamak
Jose Boedo,Dmitry Rudakov,R.A. Moyer,Sergei Krasheninnikov,Dennis Whyte,G. R. McKee,George Tynan,M.J. Schaffer,P.C. Stangeby,P. West,S.L. Allen,Todd Evans,R. J. Fonck,E. M. Hollmann,Anthony Leonard,A. Mahdavi,G. D. Porter,M. Tillack,G. Antar +18 more
TL;DR: Intermittent plasma objects (IPOs) featuring higher pressure than the surrounding plasma, and responsible for ∼50% of the E×BT radial transport, are observed in the scrape off layer (SOL) and edge of the DIII-D tokamak.
Journal ArticleDOI
Real time equilibrium reconstruction for tokamak discharge control
TL;DR: In this article, a real-time solution for the spatial distribution of poloidal flux and toroidal current density is presented, which is consistent with plasma force balance, allowing accurate evaluation of parameters such as discharge shape and safety factor profile.
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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