Multifield measurement of magnetic fluctuation-induced particle flux in a high-temperature toroidal plasma

Magnetic fluctuation-induced particle transport is explored in the high-temperature, high-beta interior of the Madison symmetric torus (MST) reversed-field pinch by performing a multifield measurement of the correlated product of magnetic and density fluctuations associated with global resistive tea...

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Bibliographic Details
Published in:Nuclear fusion 2016-12, Vol.56 (12), p.126020
Main Authors: Lin, L., Ding, W.X., Brower, D.L.
Format: Article
Language:English
Subjects:
fluctuations
magnetic
Physics
transport
turbulence
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Summary:Magnetic fluctuation-induced particle transport is explored in the high-temperature, high-beta interior of the Madison symmetric torus (MST) reversed-field pinch by performing a multifield measurement of the correlated product of magnetic and density fluctuations associated with global resistive tearing modes. Local density fluctuations are obtained by inverting the line-integrated interferometry data after resolving the mode helicity through correlation techniques. The local magnetic and current density fluctuations are then reconstructed using a parameterized fit of Faraday-effect polarimetry measurements. Reconstructed 2D images of density and current density perturbations in a poloidal cross section exhibit significantly different spatial structure. Combined with their relative phase, the magnetic-fluctuation-induced particle transport flux and its spatial distribution are resolved. The convective magnetic fluctuation-induced particle flux profile is measured for both standard and high-performance plasmas in MST with tokamak-like confinement, showing large reduction in the flux during improved confinement.
ISSN:0029-5515
1741-4326
DOI:10.1088/0029-5515/56/12/126020