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
Plasma density limits during Ohmic L mode and ELMing H mode operation in DIII-D
TL;DR: In this paper, the density limits in Ohmic and L mode discharges were determined over a wide range of parameters: BT = 0.8-2.1 T, Ip = 1.5-1.9 MA, an elongation of 1.09 to 1.4; the density limit showed little dependence on either BT or plasma elongation.
Journal ArticleDOI
Formation and sustainment of a low‐aspect ratio tokamak by coaxial helicity injection
TL;DR: In this article, a low-aspect-ratio tokamak with toroidal currents, Ip, up to 250 kA was constructed using coaxial helicity injection.
Journal ArticleDOI
Numerical Transport Codes
J. Ongena,M. Evrard,D.C. McCune +2 more
TL;DR: The relevant equations that are used in these codes are established, and on the basis of these equations, the necessary calculations needed to resolve them are pointed out.
Journal ArticleDOI
ASDEX upgrade MHD equilibria reconstruction on distributed workstations
Wolf-Dieter Schneider,Patrick J. McCarthy,K. Lackner,O. Gruber,K. Behler,P. Martin,R. Merkel +6 more
TL;DR: In this paper, an interpretive equilibrium code CLISTE is proposed for the calculation of MHD equilibria on an intershot timescale, parallelized by the use of a Message Passing Interface (MPI).
Journal ArticleDOI
RF-Plasma Edge Interactions and their Impact on ICRF Antenna Performance in Alcator C-Mod
S.J. Wukitch,Bruce Lipschultz,Earl Marmar,Yu-Ming Lin,A. Parisot,Matthew Reinke,John Rice,J.L. Terry +7 more
TL;DR: In this article, the authors investigated the compatibility of high power ion cyclotron range of frequencies antenna with high performance plasmas and all high-Z plasma facing components, to provide operational information for future devices such as ITER.
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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