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Article overview
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Equilibrium reconstruction with 3D eddy currents in the Lithium Tokamak eXperiment | | C. Hansen
; D. P. Boyle
; J. C. Schmitt
; R. Majeski
; | | Date: |
20 Jan 2017 | | 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 vacuum vessel and first
wall structures. To account for this effect, reconstructions are performed with
additional toroidal current sources in these conducting regions. The source
distributions are fixed poloidally, but their scale 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. An accompanying field
perturbation produced by 3D eddy currents on the plasma surface with primarily
n=2, m=1 character is also predicted for these equilibria. | | Source: | arXiv, 1701.5851 | | Services: | Forum | Review | PDF | Favorites | |
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