Equilibrium reconstruction with 3D eddy currents in the Lithium Tokamak eXperiment
Abstract
Axisymmetric free-boundary equilibrium reconstructions of tokamak plasmas in the Lithium Tokamak eXperiment (LTX) are performed using the PSI-Tri equilibrium code. Reconstructions in LTX are complicated by the presence of long-lived non-axisymmetric eddy currents generated by a vacuum vessel and first wall structures. To account for this effect, reconstructions are performed with additional toroidal current sources in these conducting regions. The eddy current sources are fixed in their poloidal distributions, but their magnitude is adjusted as part of the full reconstruction. Eddy distributions are computed by toroidally averaging currents, generated by coupling to vacuum field coils, from a simplified 3D filament model of important conducting structures. The full 3D eddy current fields are also used to enable the inclusion of local magnetic field measurements, which have strong 3D eddy current pick-up, as reconstruction constraints. Using this method, equilibrium reconstruction yields good agreement with all available diagnostic signals. Here, an accompanying field perturbation produced by 3D eddy currents on the plasma surface with a primarily n = 2, m = 1 character is also predicted for these equilibria.
- Authors:
-
[1];
[2];
- Univ. of Washington, Seattle, WA (United States); Columbia Univ., New York, NY (United States)
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Auburn Univ., AL (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Univ. of Washington, Seattle, WA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1358666
- Alternate Identifier(s):
- OSTI ID: 1361829; OSTI ID: 1608228
- Grant/Contract Number:
- SC0016256; AC02-09CH11466
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 24; Journal Issue: 4; 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; 97 MATHEMATICS AND COMPUTING
Citation Formats
Hansen, C., Boyle, D. P., Schmitt, J. C., and Majeski, R. Equilibrium reconstruction with 3D eddy currents in the Lithium Tokamak eXperiment. United States: N. p., 2017.
Web. doi:10.1063/1.4981214.
Hansen, C., Boyle, D. P., Schmitt, J. C., & Majeski, R. Equilibrium reconstruction with 3D eddy currents in the Lithium Tokamak eXperiment. United States. https://doi.org/10.1063/1.4981214
Hansen, C., Boyle, D. P., Schmitt, J. C., and Majeski, R. Tue .
"Equilibrium reconstruction with 3D eddy currents in the Lithium Tokamak eXperiment". United States. https://doi.org/10.1063/1.4981214. https://www.osti.gov/servlets/purl/1358666.
@article{osti_1358666,
title = {Equilibrium reconstruction with 3D eddy currents in the Lithium Tokamak eXperiment},
author = {Hansen, C. and Boyle, D. P. and Schmitt, J. C. and Majeski, R.},
abstractNote = {Axisymmetric free-boundary equilibrium reconstructions of tokamak plasmas in the Lithium Tokamak eXperiment (LTX) are performed using the PSI-Tri equilibrium code. Reconstructions in LTX are complicated by the presence of long-lived non-axisymmetric eddy currents generated by a vacuum vessel and first wall structures. To account for this effect, reconstructions are performed with additional toroidal current sources in these conducting regions. The eddy current sources are fixed in their poloidal distributions, but their magnitude is adjusted as part of the full reconstruction. Eddy distributions are computed by toroidally averaging currents, generated by coupling to vacuum field coils, from a simplified 3D filament model of important conducting structures. The full 3D eddy current fields are also used to enable the inclusion of local magnetic field measurements, which have strong 3D eddy current pick-up, as reconstruction constraints. Using this method, equilibrium reconstruction yields good agreement with all available diagnostic signals. Here, an accompanying field perturbation produced by 3D eddy currents on the plasma surface with a primarily n = 2, m = 1 character is also predicted for these equilibria.},
doi = {10.1063/1.4981214},
journal = {Physics of Plasmas},
number = 4,
volume = 24,
place = {United States},
year = {Tue Apr 18 00:00:00 EDT 2017},
month = {Tue Apr 18 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
Magnetic perturbation diagnostics in the high-temperature lithiated environment of LTX- β
journal, October 2018
- Hughes, P. E.; Majeski, R.; Kaita, R.
- Review of Scientific Instruments, Vol. 89, Issue 10