MEASUREMENT OF IMPURITY INFLUXES IN JET BY VISIBLE AND VUV SPECTROSCOPY
Impurity influxes from walls and carbon limiters in JET are derived from the intensities of lines in the visible spectrum. Excitation rate coefficients are calculated by an atomic physics code and metastable state populations are assessed experimentally. During occasional plasma discharges limited by the inner wall protection plates, influx studies are made using VUV resonance lines, the excitation rate coefficients of which are known reliably. Both data sets yield consistent results for the population of metastable states in C II and C III, and the fluxes from C II, C III, and of O II, O III, respectively. Information on the spreading of ions along field lines and on boundary temperature changes is obtained from the VUV spectra.
Bibliographic Reference: 27TH ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS, SAN DIEGO (USA), NOV. 4-8, 1985 PAPER 3P3, PROCEEDINGS P. 1414
Record Number: 1989124128500 / Last updated on: 1987-01-01
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