To explore a deep space for a long-time period, a spacecraft must have a long-lifetime and high efficiency thruster. We have proposed an electrodeless plasma propulsion system using a high-density (~10^{13} cm^{-3})
helicon plasma. To characterize this thruster, we need to measure plasma parameters, e.g., an electron density
and its temperature. To determine these parameters without any disturbance to in a plasma, we have been developing a spectroscopic measurement method using a Collisional Radiative (CR) model. This method needs many parameters, e.g., cross-section, diffusion, and various assumptions. In this study, improvement of some parameters and calculation results will be presented.
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