Magnetic Diagnostics for Equilibrium Reconstructions with Eddy Currents on the Lithium Tokamak Experiment
Authors: J.C. Schmitt, J. Bialek, S. Lazerson, and R. Majeski
Abstract: The Lithium Tokamak eXperiment is a spherical tokamak with a close-fitting low-recycling wall composed of thin lithium layers evaporated onto a stainless steel-lined copper shell. Long-lived non-axisymmetric eddy currents are induced in the shell and vacuum vessel by transient plasma and coil currents and these eddy currents influence both the plasma and the magnetic diagnositc signals that are used as constraints for equilibrium reconstruction. A newly installed set of re-entrant magnetic diagnostics and internal saddle flux loops, compatible with high-temperatures and lithium environments, is discussed. Details of the axisymmetric (2D) and non-axisymmetric (3D) treatments of the eddy currents and the equilibrium reconstruction are presented.
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Presented at: The 20th Topical Conference on High-Temperature Plasma Diagnostics, Atlanta, Georgia, June, 2014.
Published in: RSI 85, 11E817 (2014) DOI: 10.1063/1.4892159
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