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
Initial measurements of the DIII-D off-axis neutral beams
William Heidbrink,M. A. Van Zeeland,Brian Grierson,Christopher Muscatello,Jin Myung Park,C.C. Petty,Ron Prater,Y. B. Zhu +7 more
TL;DR: In this article, two neutral-beam sources on the DIII-D tokamak were modified to allow injection below the midplane to validate off-axis beam performance, the various beams are injected sequentially into low-power plasmas that are optimized for accurate neutron, neutral-particle, fast-ion D-alpha and fast ion pressure measurements.
Journal ArticleDOI
Plasma Startup Design of Fully Superconducting Tokamaks EAST and KSTAR With Implications for ITER
J.A. Leuer,N.W. Eidietis,J.R. Ferron,D.A. Humphreys,A.W. Hyatt,G.L. Jackson,Robert D. Johnson,B.G. Penaflor,D.A. Piglowski,M.L. Walker,A.S. Welander,S.W. Yoon,Sang-hee Hahn,Yeong-Kook Oh,B. J. Xiao,Hu Wang,Q.P. Yuan,D. Mueller +17 more
TL;DR: An overview of the generic modeling environment and plasma control tools developed and validated within the DIII-D experimental program and applied through an international collaborative program to successfully address the unique constraints associated with the startup of these next-generation tokamaks are provided.
Journal ArticleDOI
Quiescence near the X-point of MAST measured by high speed visible imaging
Nick Walkden,James Harrison,S. A. Silburn,T. Farley,S. S. Henderson,A. Kirk,Fulvio Militello,A. J. Thornton +7 more
TL;DR: In this paper, the quiescent X-point region (QXR) was found to be ubiquitous across a significant operational space in MAST including L-mode and H-mode discharges across maximal ranges of 9. 8 × 10 19 m − 2 in line integrated density, 0. 36MA in plasma current, 0. 11T in toroidal magnetic field and 3. 2MW in NBI power.
Journal ArticleDOI
The effect of neutrals in the new SAS divertor at DIII-D as modelled by SOLPS
TL;DR: In this paper, the Small Angle Slot (SAS) divertor was used to control the neutral recycling flux to facilitate power dissipation in a steady-state tokamak.
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