Physics
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jqsrt..17..139d&link_type=abstract
Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 17, Feb. 1977, p. 139-147. ERDA-supported research.
Physics
10
Ion Distribution, Plasma Temperature, Radiative Recombination, Tokamak Devices, Ferric Ions, Impurities, Reactor Technology
Scientific paper
Calculations are presented for the rates of radiative energy loss from Tokamak plasmas arising from radiation processes involving collisions between electrons and multiply-charged Fe impurity ions. The distribution of ionization states is determined from the steady-state corona model. The inclusion of dielectronic recombination raises the temperature at which each ion has its maximum equilibrium abundance. For certain nonhydrogenic ions, the dielectronic recombination rates obtained from previous calculations are found to be overestimated due to the neglect of autoionization into an excited state of the recombining ion. Electron-impact excitation of resonance line radiation in the far-ultraviolet and X-ray regions is the dominant radiative cooling mechanism at temperatures where ions with bound electrons are abundant. However, the radiation emitted during dielectronic recombination can be more important than direct recombination radiation and bremsstrahlung.
Blaha M.
Davis Jared
Jacobs Verne L.
Kepple Paul C.
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