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
Fast equilibrium reconstruction for tokamak discharge control based on GPU
TL;DR: A parallel code named P-EFIT which could complete an equilibrium reconstruction iteration in 220 µs and static test and simulation-test proves the feasibility of using P- EFIT for real-time reconstruction with a 65 × 65 grid.
Journal ArticleDOI
Stable ellipticity-induced Alfvén eigenmodes in the Joint European Torus
TL;DR: In this paper, Rebut et al. showed that the frequency of the modes (240−290 kHz) falls in the gap in the magnetohydrodynamic (MHD) continuum that is produced by ellipticity.
Journal ArticleDOI
Onset of tearing modes in plasma termination on JET: the role of temperature hollowing and edge cooling
G. Pucella,P. Buratti,E. Giovannozzi,E. Alessi,Fulvio Auriemma,D. Brunetti,Diogo R. Ferreira,M. Baruzzo,D. Frigione,L. Garzotti,E. Joffrin,E. Lerche,P. J. Lomas,S. Nowak,L. Piron,F.G. Rimini,Carlo Sozzi,D. Van Eester,Jet Contributors +18 more
TL;DR: In this paper, the onset of tearing modes in the termination phase of plasma pulses on JET is investigated and two parameters are defined to highlight changes in the shape of the temperature profile that can lead to MHD instabilities and an empirical stability diagram is introduced into the space of the two new parameters.
Journal ArticleDOI
Equilibrium and stability studies of oblate field-reversed configurations in the Magnetic Reconnection Experiment
S. P. Gerhardt,Elena Belova,M. Inomoto,M. Inomoto,Masaaki Yamada,Hantao Ji,Y. Ren,Aleksey Kuritsyn +7 more
TL;DR: Yamada et al. as discussed by the authors studied the equilibrium and stability of oblate field-reversed configurations (FRCs) and developed a code to calculate equilibria for these plasmas.
Journal ArticleDOI
Transition to subcritical turbulence in a tokamak plasma
F. van Wyk,Edmund Hood Highcock,Alexander Schekochihin,Colin Roach,A. R. Field,William Dorland +5 more
TL;DR: In this paper, the authors investigated the stability of the inner core of the Mega-Ampere Spherical Tokamak (MAST) and showed that the system is stable to small perturbations, but, given a large enough initial perturbation, it transitions to a turbulent state.
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