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

Journal Article · Sat Nov 15 04:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4892159· OSTI ID:22308664

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

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1. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
2. Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 (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 diagnostic 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.

• OSTI ID: 22308664
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 85; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
AXIAL SYMMETRY
CONTAINERS
COPPER
EDDY CURRENTS
EQUILIBRIUM
LIMITING VALUES
LITHIUM
MAGNETIC PROBES
PLASMA
SIGNALS
SPHERICAL CONFIGURATION
STAINLESS STEELS
TEMPERATURE RANGE 0400-1000 K
TOKAMAK DEVICES