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

Abstract

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.

Authors:
 [1];  [1];  [1];  [2];  [1];  [3];  [1];  [3];  [1];  [1];  [1];  [1];  [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Auburn Univ., AL (United States)
  3. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1261367
Alternate Identifier(s):
OSTI ID: 1243361
Grant/Contract Number:  
AC05-00OR22725; FC0205ER54814
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 3; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

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., and Parker, E. Three dimensional equilibrium solutions for a current-carrying reversed-field pinch plasma with a close-fitting conducting shell. United States: N. p., 2016. Web. doi:10.1063/1.4944670.
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. Three dimensional equilibrium solutions for a current-carrying reversed-field pinch plasma with a close-fitting conducting shell. United States. doi:10.1063/1.4944670.
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., and Parker, E. Fri . "Three dimensional equilibrium solutions for a current-carrying reversed-field pinch plasma with a close-fitting conducting shell". United States. doi:10.1063/1.4944670. https://www.osti.gov/servlets/purl/1261367.
@article{osti_1261367,
title = {Three dimensional equilibrium solutions for a current-carrying reversed-field pinch plasma with a close-fitting conducting shell},
author = {Koliner, J. J. and Boguski, J. and Anderson, J. K. and Hanson, J. D. and Chapman, B. E. and Brower, D. L. and Den Hartog, D. J. and Ding, W. X. and Duff, J. R. and Goetz, J. A. and McGarry, M. and Morton, L. A. and Parker, E.},
abstractNote = {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.},
doi = {10.1063/1.4944670},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 3,
volume = 23,
place = {United States},
year = {2016},
month = {3}
}

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