H
H.E. St. John
Researcher at General Atomics
Publications - 66
Citations - 5606
H.E. St. John is an academic researcher from General Atomics. The author has contributed to research in topics: Tokamak & DIII-D. The author has an hindex of 34, co-authored 66 publications receiving 5236 citations.
Papers
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Journal ArticleDOI
Reconstruction of current profile parameters and plasma shapes in tokamaks
TL;DR: 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.
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Equilibrium analysis of current profiles in tokamaks
TL;DR: In this paper, an efficient method is given for self-consistent reconstruction of the tokamak current profiles and their associated magnetic topology using the magnetohydrodynamic (MHD) equilibrium constraint from external magnetic measurements, kinetic profile measurements, internal poloidal magnetic field measurements, and topological information from soft X-ray (SXR) measurements.
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Real time equilibrium reconstruction for tokamak discharge control
TL;DR: In this article, a real-time solution for the spatial distribution of poloidal flux and toroidal current density is presented, which is consistent with plasma force balance, allowing accurate evaluation of parameters such as discharge shape and safety factor profile.
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MHD Equilibrium Reconstruction in the DIII-D Tokamak
L. L. Lao,H.E. St. John,Q. Peng,J.R. Ferron,E. J. Strait,T. S. Taylor,W. H. Meyer,Chuanguo Zhang,K. I. You +8 more
TL;DR: In this paper, the development of axisymmetric magnetohydrodynamic equilibrium reconstruction to support plasma operation and data analysis in the DIII-D tokamak is discussed.
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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.