Magnetic diagnostics for equilibrium reconstructions with eddy currents on the lithium tokamak experimenta)

Journal Article · Sat Nov 01 04:00:00 EDT 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4892159· OSTI ID:1182283

Schmitt, J. C. ^[1]; Bialek, J. ^[2]; Lazerson, S. ^[1]; Majeski, R. ^[1]

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1. Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
2. Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY (United States)

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.

• Research Organization: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-09CH11466; AC05-00OR22725
• OSTI ID: 1182283
• Report Number(s): PPPL--5065
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 85; ISSN 0034-6748; ISSN RSINAK
• Publisher: Optical Society of America
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Eddy Currents
Equilibrium
Magnetics