Search Results - "Prager, S. C."

MOMENTUM TRANSPORT FROM CURRENT-DRIVEN RECONNECTION IN ASTROPHYSICAL DISKS by EBRAHIMI, F, PRAGER, S. C

“…Current-driven reconnection is investigated as a possible mechanism for angular momentum transport in astrophysical disks. A theoretical and computational…”
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Saturation of Magnetorotational Instability Through Magnetic Field Generation by Ebrahimi, F, Prager, S. C, Schnack, D. D

“…The saturation mechanism of magnetorotational instability (MRI) is examined through analytical quasi-linear theory and through nonlinear computation of a…”
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Measurement of the hall dynamo effect during magnetic reconnection in a high-temperature plasma by DING, W. X, BREWER, D. L, CRAIG, D, DENG, B. H, FIKSEL, G, MIRNOV, V, PRAGER, S. C, SARFF, J. S, SVIDZINSKI, V

“…The fluctuation-induced Hall electromotive force, [deltaJ x deltaB]/nee, is experimentally measured in the high-temperature interior of a reversed-field pinch…”
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Magnetic-fluctuation-induced particle transport and density relaxation in a high-temperature plasma by Ding, W X, Brower, D L, Fiksel, G, Den Hartog, D J, Prager, S C, Sarff, J S

“…The first direct measurement of magnetic-fluctuation-induced particle flux in the core of a high-temperature plasma is reported. Transport occurs due to…”
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Electron heat transport measured in a stochastic magnetic field by Biewer, T M, Forest, C B, Anderson, J K, Fiksel, G, Hudson, B, Prager, S C, Sarff, J S, Wright, J C, Brower, D L, Ding, W X, Terry, S D

“…New profile measurements have allowed the electron thermal diffusivity profile to be estimated from power balance in the Madison Symmetric Torus where magnetic…”
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Observation of weak impact of a stochastic magnetic field on fast-ion confinement by Fiksel, G, Hudson, B, Den Hartog, D J, Magee, R M, O'Connell, R, Prager, S C, Beklemishev, A D, Davydenko, V I, Ivanov, A A, Tsidulko, Yu A

“…Fast ions are observed to be very well confined in the Madison Symmetric Torus reversed field pinch despite the presence of stochastic magnetic field. The…”
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Nonambipolar magnetic-fluctuation-induced particle transport and plasma flow in the MST reversed-field pinch by Ding, W X, Brower, D L, Craig, D, Deng, B H, Prager, S C, Sarff, J S, Svidzinski, V

“…First direct measurements of nonambipolar magnetic fluctuation-induced charge transport in the interior of a high-temperature plasma are reported. Global…”
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Cause of sudden magnetic reconnection in a laboratory plasma by Choi, S, Craig, D, Ebrahimi, F, Prager, S C

“…The cause for sudden reconnection in reversed field pinch plasmas is determined experimentally for two cases: large reconnection events (the sawtooth crash)…”
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Observation of velocity-independent electron transport in the reversed field pinch by O'Connell, R, Den Hartog, D J, Forest, C B, Anderson, J K, Biewer, T M, Chapman, B E, Craig, D, Fiksel, G, Prager, S C, Sarff, J S, Terry, S D, Harvey, R W

“…Confinement of runaway electrons has been observed for the first time in a reversed field pinch during improved-confinement plasmas in the Madison Symmetric…”
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Measurement of the current-density profile and plasma dynamics in the reversed-field pinch by Brower, D L, Ding, W X, Terry, S D, Anderson, J K, Biewer, T M, Chapman, B E, Craig, D, Forest, C B, Prager, S C, Sarff, J S

“…First measurements of the current-density profile in the core of a high-temperature reversed-field pinch are presented. The current-density profile is observed…”
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Spectroscopic observation of fluctuation-induced dynamo in the edge of the reversed-field pinch by Fontana, P W, Den Hartog, D J, Fiksel, G, Prager, S C

“…The fluctuation-induced dynamo <v x b> has been investigated by direct measurement of v and b in the edge of a reversed-field pinch and is found to be…”
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Oscillating-field current-drive experiments in a reversed field pinch by McCollam, K J, Blair, A P, Prager, S C, Sarff, J S

“…Oscillating-field current drive (OFCD) is a steady-state magnetic helicity injection method to drive net toroidal current in a plasma by applying oscillating…”
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Measurement of internal magnetic field fluctuations in a reversed-field pinch by Faraday rotation by Ding, W X, Brower, D L, Terry, S D, Craig, D, Prager, S C, Sarff, J S, Wright, J C

“…Magnetic field fluctuations (and the associated current perturbation) have been measured in the core of a high-temperature reversed-field pinch using a newly…”
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On the physics of improved confinement during pulsed poloidal current drive in MST reversed-field pinch by SVIDZINSKI, V. A, PRAGER, S. C

“…Reduction of core-resonant magnetic fluctuations and improved confinement in the Madison Symmetric Torus reversed-field pinch (MST RFP) have been routinely…”
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Experimental observation of anisotropic magnetic turbulence in a reversed field pinch plasma by Ren, Y, Almagri, A F, Fiksel, G, Prager, S C, Sarff, J S, Terry, P W

“…In this Letter we report an experimental study of fully developed anisotropic magnetic turbulence in a laboratory plasma. The turbulence has broad (narrow)…”
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Reduced edge instability and improved confinement in the MST reversed-field pinch by Chapman, B E, Anderson, J K, Biewer, T M, Brower, D L, Castillo, S, Chattopadhyay, P K, Chiang, C S, Craig, D, Den Hartog, D J, Fiksel, G, Fontana, P W, Forest, C B, Gerhardt, S, Hansen, A K, Holly, D, Jiang, Y, Lanier, N E, Prager, S C, Reardon, J C, Sarff, J S

“…Improved confinement has been achieved in the MST through control of the poloidal electric field, but it is now known that the improvement has been limited by…”
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Fluctuation and transport reduction in a reversed field pinch by inductive poloidal current drive by Sarff, JS, Hokin, SA, Ji, H, Prager, SC, Sovinec, CR

“…An auxiliary poloidal inductive electric field applied to a reserved field pinch plasma reduces the current density gradient, slows the growth of [ital m]=1…”
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Measurement of the current sheet during magnetic reconnection in a toroidal plasma by Crocker, N A, Fiksel, G, Prager, S C, Sarff, J S

“…The current and magnetic-field fluctuations associated with magnetic-field-line reconnection have been measured in the reversed field pinch plasma…”
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Time-resolved observation of discrete and continuous magnetohydrodynamic dynamo in the reversed-field pinch edge by Ji, H, Almagri, AF, Prager, SC, Sarff, JS

“…We report the first experimental verification of the magnetohydrodynamic (MHD) dynamo in the reversed-field pinch (RFP). A burst of MHD dynamo electric field…”
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Measurement of nonlinear mode coupling of tearing fluctuations by ASSADI, S, PRAGER, S. C, SIDIKMAN, K. L

“…Three-wave nonlinear coupling of spatial Fourier modes is measured in the MST reversed field pinch by applying bispectral analysis to magnetic fluctuations…”
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