Journal ArticleDOI
Reconstruction of current profile parameters and plasma shapes in tokamaks
Reads0
Chats0
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
More filters
Journal ArticleDOI
An assessment of ion temperature measurements in the boundary of the Alcator C-Mod tokamak and implications for ion fluid heat flux limiters
Dan Brunner,Brian LaBombard,Randy Michael Churchill,Jerry Hughes,Bruce Lipschultz,R. Ochoukov,T.D. Rognlien,Christian Theiler,J.R. Walk,Maxim Umansky,D Whyte +10 more
TL;DR: In this article, a comparison of ion temperature measurements in the boundary of the Alcator C-Mod tokamak from three different diagnostics: charge exchange recombination spectroscopy (CXRS), an ion sensitive probe (ISP), and a retarding field analyzer (RFA) is presented.
ReportDOI
The taming of the Grid : virtual application services.
TL;DR: This report develops a view of the Grid based on the application service provider (ASP) model, focusing on real-time, deadline-bound execution as the quality of service derived by a client, and describes an architecture implementing these ideas.
Journal ArticleDOI
Predictive transport simulations of real-time profile control in JET advanced tokamak plasmas
Tuomas Tala,L. Laborde,Didier Mazon,D. Moreau,G. Corrigan,F. Crisanti,Xavier Garbet,D. Heading,E. Joffrin,X. Litaudon,Vassili Parail,A. Salmi +11 more
TL;DR: Moreau et al. as mentioned in this paper used a real-time control (RTC) technique to control the q-profile and the strength and location of the internal transport barrier (ITB).
Journal ArticleDOI
Effects of LHRF on toroidal rotation in Alcator C-Mod plasmas
John Rice,Y. Podpaly,Matthew Reinke,C. Gao,Syun'ichi Shiraiwa,J.L. Terry,Christian Theiler,G.M. Wallace,P.T. Bonoli,Dan Brunner,Randy Michael Churchill,Istvan Cziegler,L. F. Delgado-Aparicio,Patrick Diamond,Ian Faust,Nathaniel J. Fisch,Robert Granetz,Martin Greenwald,Amanda Hubbard,Jerry Hughes,Ian H. Hutchinson,J. H. Irby,Jungpyo Lee,Yu-Ming Lin,Earl Marmar,Robert Mumgaard,R.R. Parker,S. D. Scott,J.R. Walk,S.M. Wolfe,S.J. Wukitch +30 more
TL;DR: In this article, lower hybrid range of frequencies (LHRF) was used to induce both co-and counter-current directed changes in toroidal rotation in Alcator C-Mod plasmas, depending on the target plasma current, electron density, confinement regime and magnetic shear.
Journal ArticleDOI
A new type of MHD activity in JET ICRF-only discharges with high fast-ion energy contents
TL;DR: In this article, the stability of sawtooth stabilization at very high fast-ion energy contents has been addressed in discharges carried out in the JET tokamak with ion cyclotron resonance frequency (ICRF) heating and varying plasma density, controlled by deuterium gas puffs.
References
More filters
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.
Related Papers (5)
Plasma Physics and Controlled Nuclear Fusion Research
Neoclassical conductivity and bootstrap current formulas for general axisymmetric equilibria and arbitrary collisionality regime
Suppression of large edge-localized modes in high-confinement DIII-D plasmas with a stochastic magnetic boundary.
Todd Evans,R.A. Moyer,P R Thomas,J.G. Watkins,T.H. Osborne,Jose Boedo,E. J. Doyle,Max E. Fenstermacher,K.H. Finken,R. J. Groebner,M. Groth,J. H. Harris,R.J. La Haye,C.J. Lasnier,Suguru Masuzaki,Nobuyoshi Ohyabu,D. G. Pretty,T. L. Rhodes,H. Reimerdes,D.L. Rudakov,M.J. Schaffer,G. Wang,Lei Zeng +22 more