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
Numerical simulations of NBI fast ion loss with RMPs on the EAST tokamak
TL;DR: In this article, fast ion losses in the presence of resonant magnetic perturbations (RMPs) on the EAST tokamak were simulated by using the Monte Carlo orbit-following code GYCAVA.
Journal ArticleDOI
Setting the H-mode pedestal structure: Variations of particle source location using gas puff and pellet fueling
Andrew Nelson,Andrew Nelson,Florian Laggner,R. J. Groebner,Brian Grierson,Olivier Izacard,David Eldon,Morgan Shafer,Anthony Leonard,Daisuke Shiraki,Aaron Sontag,Egemen Kolemen +11 more
TL;DR: In this paper, the effect of gas and pellet fuel on the H-mode pedestal structure was examined in DIII-D by comparing controlled pellet and gas-fueled discharges across a fueling scan.
Journal ArticleDOI
Experimental and modeling uncertainties in the validation of lower hybrid current drive
Francesca Poli,P.T. Bonoli,M. Chilenski,Robert Mumgaard,Syun'ichi Shiraiwa,G.M. Wallace,R. Andre,L. F. Delgado-Aparicio,S. D. Scott,James R. Wilson,R. W. Harvey,Yu. V. Petrov,Matthew Reinke,Ian Faust,Robert Granetz,Jerry Hughes,J. E. Rice +16 more
TL;DR: In this paper, the authors discuss sources of uncertainty in the validation of lower hybrid wave current drive simulations against experiments, by evolving self-consistently the magnetic equilibrium and the heating and current drive profiles, calculated with a combined toroidal ray tracing code and 3D Fokker-Planck solver.
Journal ArticleDOI
A metadata catalog for organization and systemization of fusion simulation data
TL;DR: An approach to managing simulation data through creation of a comprehensive metadata catalog, currently under development, is described, intended to document all past and current simulation activities; to enable global data location and to facilitate data access, analysis and visualization through uniform provision of metadata.
Journal ArticleDOI
Bayesian electron density inference from JET lithium beam emission spectra using Gaussian processes
TL;DR: In this paper, a Bayesian model to infer edge electron density profiles was developed for the JET lithium beam emission spectroscopy (Li-BES) system, measuring Li I (2p-2s) line radiation using 26 channels with si...
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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