Aachen PK 2003 – scientific programme
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P: Plasmaphysik
P 17: Poster III
P 17.33: Poster
Thursday, March 20, 2003, 17:30–19:15, Foyer
Measurements of the highly ionized stages of Argon on TEXTOR — •Oleksandr Marchuk1, Guenter Bertschinger1, Wolfgang Biel1, Hans-Joachim Kunze2, Farid Goryaev3, and Aleksandr Urnov3 — 1Insitutut für Plasma Physik, Forschungszentrum Jülich, Jülich D-52425, Germany — 2Institut für Experimentalphysik V, Ruhr-Universität Bochum, Bochum D-44780, Germany — 3P.N. Lebedev Physics Institut of RAS, Leninskii prospect 53, Moscow 119991, Russia
X-ray spectroscopy was used to measure the distribution of highly-ionized Ar atoms in ohmic and NBI heated discharges at the fusion experiment TEXTOR. The relative abundancies of H-, He-, Li-, Be-like Ar ions were obtained for different plasmas in the tokamak.
The high resolution of the spectrometer and the component structure of He-like spectra provide the important information needed to investigate the distribution of ionization stages. Complete modeling of the spectra includes atomic collision processes involving in spectra formation. The integration along the line of sight and transport code simulation substantially increase the quality of the obtained results. The values for central plasma parameters provided by the fitting procedure occurred to be in a good agreement with measurements by other diagnostics, indicating the consistency of the model. The relative position of the spectrometer with respect to different beam sources was shown to play an important role in the interpretations of results. The values of measured ionic abundancies were compared with calculated ones for coronal equilibrium and with the results of modeling by transport codes.