S. T. A. Kumar
University of Wisconsin-Madison
29 Papers
165 Citations
S. T. A. Kumar is an academic researcher from University of Wisconsin-Madison. The author has contributed to research in topics: Ion & Madison Symmetric Torus. The author has an hindex of 9, co-authored 25 publications.
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Papers
Anisotropic Ion Heating and Tail Generation during Tearing Mode Magnetic Reconnection in a High-Temperature Plasma
Richard Magee,D.J. Den Hartog,S. T. A. Kumar,A. F. Almagri,B. E. Chapman,G. Fiksel,Vladimir Mirnov,Ephrem Mezonlin,J. B. Titus +8 more
TL;DR: Measurements of ion energy distributions in a magnetically confined high-temperature plasma show that magnetic reconnection results in both anisotropic ion heating and the generation of suprathermal ions, which may offer insight into the energization process.
High resolution charge-exchange spectroscopic measurements of aluminum impurity ions in a high temperature plasma
S. T. A. Kumar,D.J. Den Hartog,B. E. Chapman,M. G. O'Mullane,Mark Nornberg,Darren Craig,S. Eilerman,Gennady Fiksel,Eli Parke,J.A. Reusch +9 more
TL;DR: In this paper, the experimental emission spectrum is fitted with a model which includes fine structure in the atomic transition and the densities of these two ionization states, calculated from charge exchange emission brightness, are used in combination with a collisional radiative model to estimate the abundance of all other charge states of aluminum in the plasma and the contribution of aluminum to the effective ionic charge of the plasma.
Determination of radial electric field from Pfirsch–Schlüter flows in the HSX stellarator
S. T. A. Kumar,Joseph Talmadge,T. J. Dobbins,F.S.B. Anderson,Konstantin Likin,David G. Anderson +5 more
TL;DR: In this article, the impurity ion parallel flow is observed in the HSX stellarator using charge exchange recombination spectroscopy (CHERS) and the asymmetry of the flow is used to calculate the magnitude and direction of the radial electric field (E r), as well as the mean flow, using computed magnetic geometry factors.
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Statistical analysis of variations in impurity ion heating at reconnection events in the Madison Symmetric Torus
TL;DR: In this article, the connection between impurity ion heating and other physical processes in the plasma is evaluated by studying variations in the amount of ion heating at reconnection events in the Madison Symmetric Torus (MST).
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Classical impurity ion confinement in a toroidal magnetized fusion plasma.
S. T. A. Kumar,D.J. Den Hartog,K.J. Caspary,R. M. Magee,Vladimir Mirnov,B. E. Chapman,Darren Craig,Gennady Fiksel,J. S. Sarff +8 more
TL;DR: High-resolution measurements of impurity ion dynamics provide first-time evidence of classical ion confinement in a toroidal, magnetically confined plasma.
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