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
The effect of divertor magnetic balance on H-mode performance in DIII-D
T.W. Petrie,C. M. Greenfield,R. J. Grobener,A.W. Hyatt,R.J. La Haye,Anthony Leonard,M.A. Mahdavi,T.H. Osborne,M.J. Schaffer,Daniel Thomas,W.P. West,S.L. Allen,Max E. Fenstermacher,C.J. Lasnier,G.D. Porter,N. S. Wolf,J.G. Watkins,T. L. Rhodes +17 more
TL;DR: In this paper, the magnetic balance of highly triangular (δ ≈ 0.8), unpumped H-mode plasmas was varied and changes in divertor heat loading and particle flux were observed when the magnetic configuration was varied from a balanced double-null divertor to a slightly unbalanced DN divertor.
Journal ArticleDOI
Observation of SOL current correlated with MHD activity in NBI heated DIII-D tokamak discharges
TL;DR: In this paper, the potential roles played by the scrape-off-layer current (SOLC) in MHD activity of tokamak plasmas, including effects on stability, were investigated.
Journal ArticleDOI
Observation of electric currents in diverted tokamak scrape-off layers
M.J. Schaffer,B. Leikind +1 more
TL;DR: In this article, a tile current array, consisting of resistors to sense current flowing from six divertor tiles into the metallic vacuum vessel, was installed in DIII-D. Data show that typically 1-2 kA circulates poloidally around the single-null divertor scrapeoff layer (SOL), a current of similar magnitude flows vertically in the outer SOL of double null plasmas and a much smaller current in the inner SOL.
Journal ArticleDOI
Equilibrium and stability studies for an iron core tokamak with a poloidal divertor
TL;DR: In this article, a study of plasma equilibrium and stability in a tokamak with an unsaturated iron core is presented, where a spool model is developed for the iron core and a simplified force balance code and a Grad-Shafranov solver are used to study the plasma equilibrium.
Journal ArticleDOI
SOLPS modeling of the effect on plasma detachment of closing the lower divertor in DIII-D
Chaofeng Sang,Chaofeng Sang,P.C. Stangeby,Houyang Guo,A.W. Leonard,B. Covele,L.L. Lao,Auna Moser,Daniel Thomas +8 more
TL;DR: In this article, the effect of tightly closing the lower divertor in DIII-D on the achievement of cold dissipative/detached divertor conditions was investigated, showing that the tightly closed divertor greatly improves trapping of recycling neutrals, thereby increasing radiative and charge exchange losses in the divertor and reducing the electron temperature.
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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