Three dimensional equilibrium solutions for a current-carrying reversed-field pinch plasma with a close-fitting conducting shell

Koliner, J. J.; Boguski, J.; Anderson, J. K.; Hanson, J. D.; Chapman, B. E.; Brower, D. L.; Den Hartog, D. J.; Ding, W. X.; Duff, J. R.; Goetz, J. A.; McGarry, M.; Morton, L. A.; Parker, E.

doi:10.1063/1.4944670

Three dimensional equilibrium solutions for a current-carrying reversed-field pinch plasma with a close-fitting conducting shell

Journal Article · Fri Mar 25 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4944670· OSTI ID:1261367

Koliner, J. J. ^[1]; Boguski, J. ^[1]; Anderson, J. K. ^[1]; Hanson, J. D. ^[2]; Chapman, B. E. ^[1]; Brower, D. L. ^[3]; Den Hartog, D. J. ^[1]; Ding, W. X. ^[3]; Duff, J. R. ^[1]; Goetz, J. A. ^[1]; McGarry, M. ^[1]; Morton, L. A. ^[1]; Parker, E. ^[1]

Univ. of Wisconsin, Madison, WI (United States)
Auburn Univ., AL (United States)
Univ. of California, Los Angeles, CA (United States)

In order to characterize the Madison Symmetric Torus (MST) reversed-field pinch(RFP)plasmas that bifurcate to a helical equilibrium, the V3FIT equilibrium reconstruction code was modified to include a conducting boundary. RFPplasmas become helical at a high plasma current, which induces large eddy currents in MST's thick aluminum shell. The V3FIT conducting boundary accounts for the contribution from these eddy currents to external magnetic diagnostic coil signals. This implementation of V3FIT was benchmarked against MSTFit, a 2D Grad-Shafranov solver, for axisymmetric plasmas. The two codes both fit B measurement loops around the plasma minor diameter with qualitative agreement between each other and the measured field. Fits in the 3D case converge well, with q-profile and plasma shape agreement between two distinct toroidal locking phases. Greater than 60% of the measured n = 5 component of B at r = a is due to eddy currents in the shell, as calculated by the conducting boundary model.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725; FC02-05ER54814

OSTI ID:: 1261367

Alternate ID(s):: OSTI ID: 1243361
OSTI ID: 22599047

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 23; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (3)

Development of a non-parametric Gaussian process model in the three-dimensional equilibrium reconstruction code V3FIT Howell, Eric C.; Hanson, J. D. Journal of Plasma Physics, Vol. 86, Issue 1 https://doi.org/10.1017/s0022377819000813	journal	January 2020
Fast ion transport in the quasi-single helical reversed-field pinch Bonofiglo, P. J.; Anderson, J. K.; Gobbin, M. Physics of Plasmas, Vol. 26, Issue 2 https://doi.org/10.1063/1.5084059	journal	February 2019
3D equilibrium reconstruction with islands Cianciosa, M.; Hirshman, S. P.; Seal, S. K. Plasma Physics and Controlled Fusion, Vol. 60, Issue 4 https://doi.org/10.1088/1361-6587/aaaf90	journal	March 2018

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