Determination of Fe charge-state distributions in the Princeton large torus by Bragg crystal X-ray spectroscopy

Physics – General Physics

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Charge Distribution, Iron, Metal Ions, Tokamak Devices, X Ray Spectroscopy, Electron Energy, Impurities, Ionization Cross Sections, X Ray Spectra

Scientific paper

A curved-crystal Bragg X-ray spectrometer was used to measure K-alpha or 1s-2p radiation from highly stripped Fe XVIII-Fe XXV impurity ions in the Princeton large torus tokamak. The distribution of Fe charge states in the center of the discharge was inferred from a comparison of the measured X-ray spectrum with theory. The shape of the spectrum depends strongly on electron temperature in the range 800-1500 eV. Within the factor of 2 uncertainty in L-shell ionization cross sections, measured intensities agree with theory, indicating that ion lifetime in the center of the plasma is approximately equal to or greater than the equilibration time.

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