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
Recent results from DIII-D and their implications for next generation tokamaks
J L Luxon,G. Bramson,K. H. Burrell,N.H. Brooks,D Buchenauer,R. W. Callis,T. N. Carlstrom,C Challis,M S Chu,S Coda,A P Colleraine,J.C. DeBoo,B De Gentile,J C M De Haas,E J Doyle,J.R. Ferron,R L Freeman,T Fukuda,A Futch,A Fyaretdinov,G Giruzzi,P. Gohil,Yu. A. Gorelov,C. M. Greenfield,R. J. Groebner,William Heidbrink,D. N. Hill,R.-M. Hong,W. Howl,C. L. Hsieh,G.L. Jackson,R. A. James,S Janz,T Jensen,R Jong,Y Kamada,A.G. Kellman,J.S. Kim,H Kubo,Taina Kurki-Suonio,L.L. Lao,R.J. La Haye,E. A. Lazarus,T. Lehecka,S I Lippmann,B Lloyd,John Lohr,T.C. Luce,N C Luhmann,M.A. Mahdavi,H Matsumoto,G Matthews,M Mayberry,B Mills,C.P. Moeller,T.H. Osborne,D O Overskei,W. A. Peebles,P.I. Petersen,T.W. Petrie,C Petty,Rolf Philipona,J.C. Phillips,R. I. Pinsker,P.A. Politzer,M Porkolab,G.D. Porter,R. Prater,M.E. Rensink,J Rodriguez,G Sager,M.J. Schaffer,D.P. Schissel,J. T. Scoville,R. P. Seraydarian,T. C. Simonen,R. T. Snider,B. W. Stallard,R.D. Stambaugh,H.E. St. John,R. E. Stockdale,E. J. Strait,P L Taylor,T. S. Taylor,P K Trost,V Trukhin,J Wight,J Winter,D. Wroblewski +88 more
TL;DR: In this paper, the DIII-D tokamak has provided significant contributions to the understanding of many of the elements of tokak physics and the application of this understanding to the design of next generation devices including ITER and CIT.
Journal ArticleDOI
Particle transport studies for single-null divertor discharges in DIII-D
TL;DR: Doyle et al. as discussed by the authors investigated the particle confinement for beam-heated single-null discharges in the open divertor configuration of Doublet III-D (DIII-D) and found that particle confinement time in the quiescent Hmode phase is only about a factor of 2 larger than during the L−mode phase.
Journal ArticleDOI
Partially detached radiative divertor with active divertor pumping
TL;DR: In this paper, the deuterium-fuelled radiative diverters, operating in the partially detached divertor (PDD) regime, are shown to be compatible with active particle exhaust conditions.
Journal ArticleDOI
Ohmic flux consumption during initial operation of the NSTX spherical torus
Jonathan Menard,B.P. LeBlanc,S.A. Sabbagh,M.G. Bell,R.E. Bell,E.D. Fredrickson,David Gates,Stephen Jardin,David Johnson,S.M. Kaye,H.W. Kugel,Rajesh Maingi,Ricardo Maqueda,D. Mueller,M. Ono,F. Paoletti,S.F. Paul,C.H. Skinner,Dan Stutman +18 more
TL;DR: In this paper, the authors quantify and optimize the ohmic current drive efficiency in an MA-class ST device and achieve sustainable ramp rates in excess of 5 MA/s during the current rise phase, while faster ramps generate significant MHD activity.
Journal ArticleDOI
Plasma Shape Control: A General Approach and Its Application to Alcator C-Mod
TL;DR: In this paper, a general approach to plasma shape control and its application to the Alcator C-Mod tokamak is described, which is linear in the magnetic measurements but is entirely algorithmic, requiring no fitting of databases.
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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