Journal ArticleDOI
Reconstruction of current profile parameters and plasma shapes in tokamaks
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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
Identification of noncircular plasma equilibria using a neural network approach
TL;DR: A technique using a single hidden layer backpropagation neural network is described to establish a nonlinear mapping between a set of magnetic flux measurements and some shaping parameters of a noncircular plasma.
Journal ArticleDOI
Explicit calculations of homoclinic tangles in tokamaks
TL;DR: In this paper, the structure of homoclinic tangles corresponding to the primary separatrix of a poloidally diverted tokamak has been studied and its properties are described.
Journal ArticleDOI
Progress towards high performance plasmas in the National Spherical Torus Experiment (NSTX)
Stanley Kaye,M.G. Bell,R. E. Bell,S. Bernabei,J.M. Bialek,T. M. Biewer,W. Blanchard,J.A. Boedo,C.E. Bush,Mark D. Carter,Wonho Choe,Neal Crocker,D. S. Darrow,W. Davis,L. F. Delgado-Aparicio,S. J. Diem,J.R. Ferron,A. R. Field,J. Foley,E.D. Fredrickson,D.A. Gates,T. Gibney,R. W. Harvey,R. Hatcher,William Heidbrink,K. W. Hill,J. C. Hosea,Thomas Jarboe,David Johnson,Robert Kaita,C.E. Kessel,S. Kubota,H.W. Kugel,J. Lawson,B.P. LeBlanc,K. C. Lee,Fred Levinton,Rajesh Maingi,J. Manickam,R.J. Maqueda,R. Marsala,D. Mastrovito,T. K. Mau,S. S. Medley,Jonathan Menard,H. F. Meyer,D. R. Mikkelsen,D. Mueller,Tobin Munsat,B. A. Nelson,C. Neumeyer,Nobuhiro Nishino,Masayuki Ono,Hyeon K. Park,W. Park,S.F. Paul,T. Peebles,M. Peng,C. K. Phillips,A. Pigarov,R. I. Pinsker,Abhay K. Ram,S. Ramakrishnan,R. Raman,David A Rasmussen,M. H. Redi,M.E. Rensink,G. Rewoldt,J. Robinson,P. Roney,A. L. Roquemore,E. Ruskov,P.M. Ryan,Steven Sabbagh,H. Schneider,C.H. Skinner,David R. Smith,Aaron Sontag,Vlad Soukhanovskii,T. Stevenson,D.P. Stotler,B. Stratton,Dan Stutman,D.W. Swain,E. J. Synakowski,Yuichi Takase,G. Taylor,Kevin Tritz,A. von Halle,M. R. Wade,Roscoe White,John B Wilgen,M. Williams,James R. Wilson,W. Zhu,Stewart Zweben,R.J. Akers,Peter Beiersdorfer,Riccardo Betti,T.S. Bigelow,Manfred Bitter,P.T. Bonoli,Clarisse Bourdelle,Choong-Seock Chang,J. Chrzanowski,Calvin Domier,L. Dudek,P. C. Efthimion,Michael Finkenthal,E. Fredd,Guoyong Fu,Alan H. Glasser,Robert James Goldston,N. L. Greenough,Larry R. Grisham,Nikolai Gorelenkov,Luca Guazzotto,R.J. Hawryluk,J.T. Hogan,Wayne A Houlberg,D.A. Humphreys,F. Jaeger,M. Kalish,Sergei Krasheninnikov,L.L. Lao,J. Lawrence,J.A. Leuer,D. W. Liu,Neville C. Luhmann,E. Mazzucato,G. Oliaro,D. Pacella,R. Parsells,M.J. Schaffer,I.B. Semenov,Ker-Chung Shaing,Michael A. Shapiro,K. Shinohara,P. Sichta,Xian-Zhu Tang,R. Vero,D. Walker,William R. Wampler +142 more
TL;DR: The National Spherical Torus Experiment (NSTX) as mentioned in this paper has been used to understand basic toroidal confinement physics at low aspect ratio and high βT in order to advance the spherical torus (ST) concept.
Journal ArticleDOI
Magnetohydrodynamic stability in a levitated dipole
TL;DR: In this article, the ideal magnetohydrodynamic (MHD) requirements for stability against interchange and high-n ballooning modes are derived at arbitrary beta for a fusion grade laboratory plasma confined by a levitated dipole.
Journal ArticleDOI
BOUT++: Recent and current developments
Ben Dudson,A. Allen,G. Breyiannis,Eric Brugger,James Buchanan,Luke Easy,Sean Farley,Ilon Joseph,Minwoo Kim,Alistair McGann,John Omotani,Maxim Umansky,Nick Walkden,T. Y. Xia,X. Q. Xu +14 more
TL;DR: Algorithms and tools which have been developed to enable creation of inputs from analytic expressions and experimental data, and for processing and visualisation of output results are presented, including a new tool Hypnotoad for the creation of meshes from experimental equilibria.
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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