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
Prompt non-resonant neutral beam-ion loss induced by Alfvén eigenmodes in the DIII-D tokamak
X. Chen,William Heidbrink,G. J. Kramer,M. A. Van Zeeland,Max E Austin,R. K. Fisher,Raffi Nazikian,David Pace,C.C. Petty +8 more
TL;DR: In this paper, the radial displacement of fast-ion displacement caused by toroidicity-induced and reversed shear Alfv?n eigenmodes (TAE/RSAEs) has been observed in DIII-D discharges.
Journal ArticleDOI
A magnetic diagnostic code for 3D fusion equilibria
TL;DR: In this paper, a synthetic magnetic diagnostics code for fusion equilibria is presented, which is validated against a vacuum shot on the Large Helical Device (LHD) where the vertical field was ramped.
Journal ArticleDOI
An Alfvén eigenmode similarity experiment
TL;DR: In this paper, the major radius dependence of Alfven mode stability is studied by creating plasmas with similar minor radius, shape, magnetic field (0.5 T), density (ne3×1019 m−3), electron temperature (1.0 keV) and beam ion population (near-tangential 80 keV deuterium injection) on both NSTX and DIII-D.
Journal ArticleDOI
Nuclear fusion: bringing a star down to Earth
TL;DR: In this paper, the authors describe how such a plasma can be confined on Earth, and discuss the similarities and differences with fusion in stars, focusing on the magnetic confinement technique and in particular the method used in a tokamak.
Journal ArticleDOI
HIS-TORIC: extending core ICRF wave simulation to include realistic SOL plasmas
TL;DR: In this article, a hybrid integration of scrape-off-layer (SOL) plasma and an ion cyclotron range of frequency (ICRF) antenna structure is presented.
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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