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
Suppression of vertical instability in elongated current-carrying plasmas by applying stellarator rotational transforma)
M.C. ArchMiller,Mark Cianciosa,David Ennis,James D. Hanson,Gregory Hartwell,J.D. Hebert,J. L. Herfindal,S. F. Knowlton,X. Ma,David Maurer,Mihir Pandya,Peter Traverso +11 more
TL;DR: In this paper, the passive stability of vertically elongated current-carrying toroidal plasmas has been investigated in the Compact Toroidal Hybrid, a stellarator/tokamak hybrid device.
Journal ArticleDOI
An analysis of controlled detachment by seeding various impurity species in high performance scenarios on DIII-D and EAST
David Eldon,Huiqian Wang,L. Wang,J. Barr,S. Ding,A.M. Garofalo,Xianzu Gong,Houyang Guo,Aaro Järvinen,Kedong Li,Joseph McClenaghan,Adam McLean,Cameron Samuell,J.G. Watkins,David Weisberg,Q.P. Yuan +15 more
TL;DR: In this paper, the authors compare the performance of nitrogen seeding and feedback control with a single Langmuir probe and show that the latter is the most straightforward sensor to use for accessing detachment onset, while the latter offers more precise control of degree of detachment.
Journal ArticleDOI
'Beam-emission spectroscopy' diagnostics also measure edge fast-ion light
TL;DR: In this article, the authors detect passive fast ion Dα (FIDA) light from fast ions that charge exchange in the high neutral density region at the edge of the plasma make appreciable contributions to the beam emission spectroscopy (BES) signals.
Journal ArticleDOI
Observation of the intrinsic rotation in KSTAR Ohmic L-mode plasmas
D.H. Na,Yong-Su Na,Sang-Gu Lee,C. Angioni,SeongMoo Yang,Hyun-Seok Kim,T.S. Hahm,Won-Ha Ko,Hogun Jhang,Wonjae Lee,Kstar Team +10 more
TL;DR: In this article, two types of experiments were carried out to conduct an intrinsic rotation study in KSTAR Ohmic L-mode plasmas, and the first was a density ramp-up experiment without neutral beam injection and the second was an experiment with beam blip technique.
Journal ArticleDOI
Scaling of plasma parameters in the SOL and divertor for Alcator C-Mod
TL;DR: In this article, a fast scanning Langmuir probe and an array of divertor-Langmuir probes are used to characterize the cross-field heat transport ( χ ⊥ ) and to compare plasma conditions upstream along a magnetic flux tube to conditions 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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