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
ELM studies on DIII-D and a comparison with ASDEX results
H. Zohm,T.H. Osborne,K. H. Burrell,Ming-Sheng Chu,E. J. Doyle,P. Gohil,D. N. Hill,L.L. Lao,A.W. Leonard,T. S. Taylor,A. D. Turnbull +10 more
TL;DR: In this article, three different types (types I, II and III) of edge localized modes (ELMs) were observed in DIII-D discharges, whereas only one type of ELM has been found in ASDEX.
Journal ArticleDOI
Microturbulence in DIII-D tokamak pedestal. I. Electrostatic instabilities
TL;DR: In this article, gyrokinetic simulations of electrostatic driftwave instabilities in a tokamak edge have been carried out to study the turbulent transport in the pedestal of an H-mode plasma.
Journal ArticleDOI
Impurity reduction during puff and pump experiments on DIII-D
M.J. Schaffer,Dennis Whyte,N.H. Brooks,J.W. Cuthbertson,J. Kim,S.I. Lippmann,M.A. Mahdavi,R. Maingi,R. D. Wood +8 more
TL;DR: In this article, a large amount of deuterium gas was continuously puffed at the scrape-off layer and exhausted from the DIII-D pump divertor ('puff and pump' technique).
Journal ArticleDOI
Modulation of prompt fast-ion loss by applied n = 2 fields in the DIII-D tokamak
M. A. Van Zeeland,Nathaniel Ferraro,William Heidbrink,G. J. Kramer,David Pace,X. Chen,Todd Evans,R. K. Fisher,M. Garcia-Munoz,Jeremy Hanson,M.J. Lanctot,L.L. Lao,R.A. Moyer,Raffi Nazikian,D.M. Orlov +14 more
TL;DR: In this paper, the authors used M3D-C1 calculations of the perturbed kinetic profiles and fields to model the acceleration of the fast-ion loss signal with respect to the internal coil (I-coil) currents.
Journal ArticleDOI
Limits to the H-mode pedestal pressure gradient in DIII-D
R. J. Groebner,P. B. Snyder,T.H. Osborne,A.W. Leonard,T. L. Rhodes,Lei Zeng,Ezekial A Unterberg,Zheng Yan,George McKee,C.J. Lasnier,J.A. Boedo,J.G. Watkins +11 more
TL;DR: In this article, the authors measured the spatial and temporal evolution of the total pedestal pressure profile during the pedestal evolution between successive edge localized modes (ELMs) of type-I ELMing H-mode discharges in DIII-D.
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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