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Author(s):
Y. Ohkouchi, S. Sasaki, S. Takamura, T. Kato,
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Title:
Effective Emission and Ionization Rate Coefficients of Atomic Carbons in Plasmas
Date of publication:
June 1993
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Key words:
carbon atoms, ionizing plasmas, excitation, ionization, line emissions.
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Abstract:
Effective emission and ionization rate coefficients of carbon atoms taking into account the density effects in plasmas are studied using a collisional radiative model including 31 sub-levels up to the principal quantum number n = 4. Atomic processes such as electron impact ionization, excitation, deexcitation and spontaneous emission, which are the dominant processes for carbon atoms generated from the wall material in fusion devices, are considered in our calculations. In a relatively high density plasma with electron density above 10^13 cm^-3, the effective ionization rate coefficient increases about by a factor of four compared with that in a low density plasma at low temperatures of ~10 eV because of the increase of ionization from the excited states. Effective emission rate coefficients for several lines, which are useful for plasma diagnostics, are also presented.
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