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
Observations of impurity toroidal rotation suppression with ITB formation in ICRF and ohmic H mode Alcator C-Mod plasmas
J. E. Rice,R. L. Boivin,P.T. Bonoli,John Goetz,Robert Granetz,Martin Greenwald,Ian H. Hutchinson,E.S. Marmar,G. Schilling,J. A. Snipes,S.M. Wolfe,S.J. Wukitch,C.L. Fiore,J. H. Irby,D. A. Mossessian,Miklos Porkolab +15 more
TL;DR: In this article, a scan of ICRF resonance location across the plasma has been performed in order to investigate possible influences on the toroidal rotation in Alcator C-Mod plasmas.
Journal ArticleDOI
Advanced techniques for neoclassical tearing mode control in DIII-D
TL;DR: In this article, two techniques were developed at DIII-D to tackle ITER-specific aspects of neoclassical tearing mode (NTM) control, namely, the relatively small size of the rotating islands, smaller than the electron cyclotron current drive (ECCD) deposition region, and the increased tendency of the islands, compared to present devices, to lock to the wall or to the residual error field, in a position not necessarily accessible to ECCD.
Journal ArticleDOI
Turbulent inward pinch of plasma confined by a levitated dipole magnet
A.C. Boxer,R.M. Bergmann,Jennifer Ellsworth,D. T. Garnier,Jay Kesner,Michael E. Mauel,Paul P. Woskov +6 more
TL;DR: In this paper, the authors found that turbulent fluctuations can actually increase the density of a plasma by driving diffusion against a density gradient, and they used a superconducting magnet to generate the confining field.
Journal ArticleDOI
Collective fast ion instability-induced losses in National Spherical Tokamak Experiment
E.D. Fredrickson,R.E. Bell,D. S. Darrow,Guoyong Fu,N. N. Gorelenkov,B.P. LeBlanc,S. S. Medley,J.E. Menard,Hae-Woong Park,A. L. Roquemore,William Heidbrink,S.A. Sabbagh,Dan Stutman,K. Tritz,Neal Crocker,S. Kubota,W. A. Peebles,K. C. Lee,Fred Levinton +18 more
TL;DR: A wide variety of fast ion driven instabilities are excited during neutral beam injection (NBI) in the National Spherical Torus Experiment (NSTX) [Nucl. Fusion 39, 2137 (1999)] and NSTX is comparable as discussed by the authors.
Journal ArticleDOI
V3FIT: a code for three-dimensional equilibrium reconstruction
James D. Hanson,S.P. Hirshman,S. F. Knowlton,Lang L. Lao,E. A. Lazarus,John Shields,John Shields +6 more
TL;DR: The V3FIT as discussed by the authors is a modular code that has the potential to be coupled with a variety of equilibrium solvers to compute the externally measured response to an arbitrary internal state of the plasma.
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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