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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Comparing simulation of plasma turbulence with experiment. II. Gyrokinetic simulations
David W. Ross,William Dorland +1 more
TL;DR: In this paper, the direct quantitative correspondence between theoretical predictions and the measured plasma fluctuations and transport is tested by performing nonlinear gyrokinetic simulations with the GS2 code, where the simulated turbulence is dominated by ion temperature gradient (ITG) modes, corrected by trappedelectron, passing-electron and impurity effects.
Journal ArticleDOI
Deep convolutional neural networks for multi-scale time-series classification and application to disruption prediction in fusion devices
TL;DR: Promising, initial disruption prediction results are obtained training a deep CNN with large receptive field, achieving an $F_1$-score of ~91% on individual time-slices using only the ECEi data.
Journal ArticleDOI
ELMs and the H-mode pedestal in NSTX
Rajesh Maingi,Steven Sabbagh,C.E. Bush,Eric Fredrickson,Jonathan Menard,Dan Stutman,Kevin Tritz,M.G. Bell,R. E. Bell,Jose Boedo,David Gates,David Johnson,Robert Kaita,Stanley Kaye,H.W. Kugel,B.P. LeBlanc,D. Mueller,R. Raman,A. L. Roquemore,Vlad Soukhanovskii,T. Stevenson +20 more
TL;DR: In this article, the behavior of ELMs in NBI-heated H-mode plasmas in NSTX was investigated and it was observed that the size of Type I ELMs, characterized by the change in plasma energy, decreases with increasing line-average density.
Journal ArticleDOI
Ion-scale turbulence in MAST: anomalous transport, subcritical transitions, and comparison to BES measurements
F. van Wyk,F. van Wyk,Edmund Hood Highcock,Edmund Hood Highcock,A. R. Field,Colin Roach,Alexander Schekochihin,Felix I. Parra,William Dorland,William Dorland +9 more
TL;DR: In this paper, the effect of varying the ion temperature gradient (ITG) and toroidal equilibrium scale sheared flow on ion-scale turbulence in the outer core of MAST was investigated by means of local gyrokinetic simulations.
Journal ArticleDOI
L-mode filament characteristics on MAST as a function of plasma current measured using visible imaging
TL;DR: In this article, the dependence of the average filament dynamics on plasma current was investigated and it was shown that the filament dynamics are consistent with the idea that the filaments are responsible for determining the particle profiles at the divertor.
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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