RECONSTRUCTION OF CURRENT-DENSITY DISTRIBUTIONS IN THE CDX-U TOKAMAK

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Magnetic diagnostics are used to reconstruct current density profiles in noninductively driven plasmas in the CDX-U tokamak. The boundary magnetic fields are measured by 32 pickup coils and three flux loops attached at different poloidal positions inside the CDX-U vessel; in addition, internal magnetic probes are also used. Significant eddy currents are measured on the thick aluminum vessel and accounted for in the analysis. Two-dimensional current density distributions and magnetic flux contours are reconstructed from these measurements using a least-square-error technique. A finite element description of plasma currents is useful for general magnetic geometries which evolve from open field lines to closed flux surfaces. By increasing the number of elements, a converged current density distribution is obtained.
Publisher
AMER INST PHYSICS
Issue Date
1992-10
Language
English
Article Type
Article; Proceedings Paper
Citation

REVIEW OF SCIENTIFIC INSTRUMENTS, v.63, no.10, pp.4747 - 4749

ISSN
0034-6748
DOI
10.1063/1.1143628
URI
http://hdl.handle.net/10203/61212
Appears in Collection
RIMS Journal Papers
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