A Study of the Diffusion of Tracer Impurities in the Versator I Tokamak Plasma by Spectral Emmissions in the Vacuum Ultraviolet Range.
Abstract
Diffusion of impurity ions was studied by artificially injecting neon gas into the Versator I tokamak (n sub e about 2 x 10 to the 13th power/cu. cm., T sub e about 150 eV, toroidal magnetic field about 5.5 kG, pulse duration about 7 msec, plasma current about 5 kA). Small amounts of neon gas were injected into the tokamak by means of a pulsed piezo-electric valve. The absolute line intensity of vacuum ultraviolet radiation in the range of 400 to 1600 A, emitted from ions which had been 3 to 7 times ionized, was observed as a function of time, and along twenty-one chords across the plasma column. The local density of neon in the plasma in space and time was determined by use of Abel inversion. From this an experimental value for the flux rate of this impurity into the plasma was inferred. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1977
- Accession Number
- ADA054756
Entities
People
- George Patrick Lasche
Organizations
- Massachusetts Institute of Technology