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
Feedback control of the safety factor profile evolution during formation of an advanced tokamak discharge
J.R. Ferron,P. Gohil,C. M. Greenfield,John Lohr,T.C. Luce,M. A. Makowski,Didier Mazon,M. Murakami,C.C. Petty,P. A. Politzer,M. R. Wade +10 more
TL;DR: Active feedback control for regulation of the safety factor (q) profile at the start of the high stored energy phase of an advanced tokamak discharge has been demonstrated in the DIII-D tokak as discussed by the authors.
Journal ArticleDOI
High spatial sampling global mode structure measurements via multichannel reflectometry in NSTX
Neal Crocker,W. A. Peebles,S. Kubota,J. Zhang,R.E. Bell,E.D. Fredrickson,Nikolai Gorelenkov,B.P. LeBlanc,Jonathan Menard,Mario Podesta,S.A. Sabbagh,Kevin Tritz,Howard Yuh +12 more
TL;DR: In this article, the GAE and CAE structures have been measured for the first time in the core of an NSTX high-power (6?MW) beam-heated H-mode plasma.
Journal ArticleDOI
A model for H mode pedestal width scaling using the International Pedestal Database
M. Sugihara,Yu. Igitkhanov,G. Janeschitz,Amanda Hubbard,Y. Kamada,J. Lingertat,T. H. Osborne,W. Suttrop +7 more
TL;DR: In this article, a new model for the H-mode pedestal (edge) width is proposed based on turbulence suppression by the combined effects of magnetic and E × B shear, and the resultant scaling of the pedestal width includes the toroidal Larmor radius and the magnetic shear.
Journal ArticleDOI
The International Multi-Tokamak Profile Database
D. Boucher,J. W. Connor,Wayne A Houlberg,M.F. Turner,G. Bracco,A. Chudnovskiy,J.G. Cordey,Martin Greenwald,G. T. Hoang,G. M. D. Hogeweij,Stanley Kaye,J.E. Kinsey,D. R. Mikkelsen,J. Ongena,D.R. Schissel,Hiroshi Shirai,J. Stober,P.M. Stubberfield,R. E. Waltz,Jan Weiland +19 more
TL;DR: An international multi-tokamak profile database has been assembled, constituting a representative set of reference tokamak discharges for the purpose of testing local transport models against well documented data, to describe the structure of the database and the discharges contributing to it so that all can take full advantage of this resource.
Journal ArticleDOI
Detailed comparison of simulated and measured plasma profiles in the scrape-off layer and edge plasma of DIII-D
TL;DR: In this paper, the results of detailed comparisons between experimental measurements of the scrape-off layer and divertor plasmas and simulations using the UEDGE code for a DIII-D discharge are reported.
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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