Journal ArticleDOI
Reconstruction of current profile parameters and plasma shapes in tokamaks
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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
Measurement of the plasma radial electric field by the motional Stark effect diagnostic on JET plasmas
S. Reyes Cortes,N. C. Hawkes,Ph. Lotte,C. Fenzi,B. Stratton,J. Hobirk,R. De Angelis,F. Orsitto,C. A. F. Varandas +8 more
TL;DR: In this paper, the motional Stark effect (MSE) polarimeter is used to measure the radial electric field (Er) in order to estimate the direction of the magnetic field.
Book ChapterDOI
Agreement-Based Interactions for Experimental Science
TL;DR: The design, implementation and application of an agreement-based infrastructure are described and its use in the virtual control room developed for the National Fusion Collaboratory is discussed.
Journal ArticleDOI
Energy conservation tests of a coupled kinetic plasma–kinetic neutral transport code
TL;DR: In this paper, an approach to coupling two kinetic particle codes for the simulation of neutral-plasma interactions in magnetic fusion devices is described, where the behavior of the neutral atoms and molecules is modeled with a Monte Carlo code.
Journal ArticleDOI
ECE for NTM control on ITER
TL;DR: In this paper, simulations are conducted for both ECE detected via the equatorial port plug and along the line-of-sight of the ECCD launchers, with settings chosen to meet the required accuracy.
Journal ArticleDOI
Cause and impact of low-frequency chirping modes in DIII-D hybrid discharges
D. Liu,William Heidbrink,Mario Podesta,Zhenzhen Ren,L. Bardoczi,E.D. Fredrickson,Guoyong Fu,C.C. Petty,Kathreen Thome,Francesca Turco,M. A. Van Zeeland +10 more
TL;DR: In this paper, the analysis of a recently compiled database of hybrid discharges suggests that the change of the fast-ion pressure especially the perpendicular pressure is the main factor responsible for the instability transition although the transition in some discharges can also be explained by a slight drop of the safety factor qmin.
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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