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 toroidicity-induced Alfvén eigenmode structure in DIII-D: Implications of soft x-ray and beam-ion loss data
E. M. Carolipio,William Heidbrink,Chio-Zong Cheng,Ming-Sheng Chu,Guoyong Fu,A. Jaun,Donald A. Spong,A. D. Turnbull,Roscoe White +8 more
TL;DR: In this paper, the internal structure of the toroidicity-induced Alfven eigenmode (TAE) was studied by comparing soft x-ray profile and beam ion loss data taken during TAE activity in the DIII-D tokamak.
Journal ArticleDOI
Equilibrium reconstruction in the START tokamak
L. Appel,M. K. Bevir,M. J. Walsh +2 more
TL;DR: In this paper, a model of flux diffusion through the vessel wall is developed, and a method for obtaining plasma equilibrium reconstructions based on the EFIT code is presented for obtaining a relatively sparse set of magnetic signals to within a fractional error of ±10%.
Journal ArticleDOI
X-ray observations of helium-like scandium from the Alcator C-Mod tokamak
TL;DR: In this paper, scandium has been injected into the Alcator C-Mod tokamak and the X-ray wavelengths of Delta n = 1 transitions to the ground state in Sc19+ and Sc18+ have been accurately determined.
Electron Heated Internal Transport Barriers in JET
G. M. D. Hogeweij,Y. Baranov,C. D. Challis,G. D. Conway,F. Crisanti,M. de Baar,N. C. Hawkes,Frederic Imbeaux,X. Litaudon,J. Mailloux,F.G. Rimini,S. E. Sharapov,Brentley Stratton,Robert Wolf,K-D. Zastrow +14 more
Journal ArticleDOI
Effect of cross-field drifts on flows in the main scrape-off-layer of DIII-D L-mode plasmas
M. Groth,J.A. Boedo,N.H. Brooks,R.C. Isler,A.W. Leonard,G.D. Porter,J.G. Watkins,W.P. West,Brad D Bray,M.E. Fenstermacher,R. J. Groebner,R.A. Moyer,D.L. Rudakov,J.H. Yu,Lei Zeng +14 more
TL;DR: In this paper, the UEDGE code has been used to understand the influence of pumping at the high field side (HFS) divertor plate, and a poloidal dependence in the radial transport coefficient.
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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