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Title: | Collisional-Radiative Model of Quasi-Stationary Helium Plasma and Its Application to the Plasma in Positive Column |
Authors: | OGATA, Yoshiro FUKUDA, Kuniya |
Issue Date: | 31-Jul-1973 |
Publisher: | Faculty of Engineering, Kyoto University |
Journal title: | Memoirs of the Faculty of Engineering, Kyoto University |
Volume: | 35 |
Issue: | 2 |
Start page: | 177 |
End page: | 199 |
Abstract: | The collisional-radiative model is applied to a quasi-stationary helium plasma and the collisional-radiative and population coefficients are calculated, provided that the level system of helium atom is composed of the ground level¹S, the four lowest excited levels, 2³S, 2¹S, 2³P and 2¹P, and higher hydrogenic levels. The ranges of plasma parameters are 8 × 10³Tₑ1.28×10⁵ °K and 10⁵nₑ10⁹ cm⁻³, and the results are compared with the data by Drawin et al. Next, the model is applied to a positive-column helium plasma and the plasma balance equation in the case of ambipolar diffusion is simultaneously solved with a set of rate equations for excited helium levels which includes the diffusion of atoms in metastable states. The results give the relation among the filling gas pressure in a discharge tube, plasma parameters and population densities of the excited levels. The atomic processes of ionization, excitation and deexcitation in the plasma are analyzed in detail. |
URI: | http://hdl.handle.net/2433/280915 |
Appears in Collections: | Vol.35 Part 2 |

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