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Title
Japanese: 
English:Determination of Electron Density and its Temperature using Collisional Radiative (CR) Model for Argon Gas in High-Density Helicon Source 
Author
Japanese: 堀田大貴, 桑原大介, 篠原俊二郎, 赤塚洋.  
English: Hirotaka Horita, Daisuke Kuwahara, Shunjiro Shinohara, Hiroshi Akatsuka.  
Language English 
Journal/Book name
Japanese: 
English:Bulletin of the American Physical Society 
Volume, Number, Page        
Published date Nov. 5, 2018 
Publisher
Japanese:米国物理学会 
English:The American Physical Society 
Conference name
Japanese: 
English:60th Annual Meeting of the APS Division of Plasma Physics 
Conference site
Japanese:ポートランド 
English:Portland 
Official URL http://meetings.aps.org/Meeting/DPP18/Session/JP11.115
 
Abstract To explore a deep space for a long-time period, a spacecraft must have a long-lifetime and highly efficient thruster. We have proposed an electrodeless plasma propulsion system using a high-density (~1013 cm-3) helicon plasma [1]. To characterize this thruster, we need to measure plasma parameters, e.g., an electron density (ne) and its temperature (Te). A probe method, which is a general measurement, is useful, but it disturbs a plasma flow. To determine these parameters without any disturbance to a plasma, we have been developing a spectral measurement method using a Collisional Radiative (CR) model for the argon atoms [2,3]. This method needs many parameters, e.g., cross-section, diffusion coefficients, and various assumptions. In this study, improvement of some parameters and calculation results compared with probe experiments, will be presented. [1] S. Shinohara, H. Nishida, T. Tanikawa, T. Hada, I. Funaki, IEEE Trans. Plasma Sci., 42 (2014) 1245. [2] J. Vlček, J. Phys. D: Appl. Phys., 22 (1989) 623. [3] H. Akatsuka, Phys. Plasmas, 16 (2009) 043502.

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