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
Magnetohydrodynamics modelling of H-mode plasma response to external resonant magnetic perturbations
TL;DR: In this paper, the response of an H-mode plasma to Resonant Magnetic Perturbations (RMPs) generated by so-called "I-coils" in DIII-D experiments on type I edge localized modes suppression is modelled using the nonlinear reduced magnetohydrodynamics (with zero-β, i.e. zero plasma temperature, in the version used here) code JOREK in X-point geometry.
Journal ArticleDOI
Fast wave and electron cyclotron current drive in the DIII-D tokamak
C.C. Petty,R.I. Pinsker,Max E Austin,F.W. Baity,S. C. Chiu,J.S. deGrassie,Cary Forest,Richard Goulding,R. W. Harvey,D.J. Hoffman,R.A. James,T.C. Luce,Miklos Porkolab,R. Prater +13 more
TL;DR: In this article, a non-inductive current drive from directional fast Alfven and electron cyclotron waves was measured in the DIII-D tokamak in order to demonstrate these forms of radiofrequency (RF) current drive and to compare the measured efficiencies with theoretical expectations.
Journal ArticleDOI
EAST equilibrium current profile reconstruction using polarimeter-interferometer internal measurement constraints
Jinping Qian,L.L. Lao,Hulin Liu,Weixing Ding,Long Zeng,Zhengping Luo,Qilong Ren,Y. Huang,Jianguo Huang,D. L. Brower,Kazuaki Hanada,Dehong Chen,Youwen Sun,B. Shen,Xianzu Gong,B.J. Xiao,B. N. Wan +16 more
TL;DR: In this article, the first equilibrium reconstruction of EAST current density profile based on internal Faraday rotation measurements provided by the POlarimeter-INTerferometer (POINT) diagnostic is demonstrated using the EFIT equilibrium reconstruction code.
Journal ArticleDOI
The relationships between edge localized modes suppression, pedestal profiles and lithium wall coatings in NSTX
TL;DR: In this article, Liptonite wall coatings suppressed edge localized modes (ELMs), gradually but not quite monotonically, in the National Spherical Torus Experiment (NSTX), where ELMs were only suppressed when lithium caused the density pedestal to widen and shift inward.
Confinement and stability of VH-mode discharges in the DIII-D tokamak
T. S. Taylor,T.H. Osborne,K. H. Burrell,T. N. Carlstrom,Vincent Chan,Chu,J.C. DeBoo,E. J. Doyle,C. M. Greenfield,R. J. Groebner,C.L. Hsieh,G.L. Jackson,R. A. James,L.L. Lao,E. A. Lazarus,S. I. Lippman,T.W. Petrie,Curtis L. Rettig,H.E. St. John,D.P. Schissel,R.D. Stambaugh,E. J. Strait,A. D. Turnbull,W.P. West,J. Winter,D. Wroblewski +25 more
TL;DR: In this paper, a regime of very high confinement (VH-mode) has been observed in neutral beam-heated deuterium discharges in the DIII-D tokamak with thermal energy confinement times up to [approx]3.
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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