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
Accurate measurements of the pitch-angle scattering of beam ions
TL;DR: In this paper, the pitch-angle scattering rate of a dilute population of 75 keV deuterium ions is measured in a well-diagnosed, relatively quiet, magnetically-confined deutium plasma.
Journal ArticleDOI
Magnetic diagnostics for equilibrium reconstruction and realtime plasma control in NSTX-Upgrade.
S.P. Gerhardt,Keith Erickson,Robert Kaita,J. Lawson,Robert Mozulay,D. Mueller,W. Que,Nabidur Rahman,H. Schneider,Gustav Smalley,Kelsey Tresemer +10 more
TL;DR: pects of magnetic diagnostics for realtime control in National Spherical Torus Experiment-Upgrade (NSTX-U) are described and an improved algorithm for estimating the plasma vertical velocity for feedback control is presented.
Journal ArticleDOI
Real time measurement of plasma macroscopic parameters on RFX-mod using a limited set of sensors
TL;DR: In this paper, a method to estimate the plasma boundary and global parameters such as βp+li/2 and the edge safety factor q95 is described, which is based on poloidal flux extrapolation in the vacuum region between the plasma and the magnetic measurements, and it is efficient and accurate even if a limited set of sensors is used.
Journal ArticleDOI
Local dependence of ion temperature gradient on magnetic configuration, rotational shear and turbulent heat flux in MAST
Young-chul Ghim,A. R. Field,Alexander Schekochihin,Edmund Highcock,Clive Michael,Clive Michael +5 more
TL;DR: In this paper, experimental data from the Mega Amp Spherical Tokamak (MAST) is used to show that the inverse gradient scale length of the ion temperature has its strongest local correlation with the rotational shear and the pitch angle of the magnetic field.
Journal ArticleDOI
Energetic ion loss detector on the Alcator C-Mod tokamak.
D. C. Pace,Robert Granetz,R.F. Vieira,A. Bader,J. Bosco,D. S. Darrow,C.L. Fiore,J. H. Irby,R.R. Parker,William M. Parkin,Matthew Reinke,J.L. Terry,S.M. Wolfe,S.J. Wukitch,Stewart Zweben +14 more
TL;DR: A scintillator-based energetic ion loss detector has been successfully commissioned on the Alcator C-Mod tokamak and the probe geometry and installation location are determined based on modeling of expected lost ions.
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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