Physics – General Physics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phrva..19.1770h&link_type=abstract
Physical Review A - General Physics, 3rd Series, vol. 19, Apr. 1979, p. 1770-1779.
Physics
General Physics
43
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.
Bitter Martin
Campbell Lachlan
Cowan Robert D.
Fraenkel B.
Greenberger A.
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