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Title
Japanese: 
English:Optical Measurements of High-Density Helicon Plasma by Using a High-Speed Camera and Monochromators 
Author
Japanese: 早稲田 真平, 藤墳 弘昌, 篠原 俊二郎, 桑原大介, 酒田 まりえ, 赤塚洋.  
English: Simpei WASEDA, Hiroaki FUJITSUKA, Shunjiro SHINOHARA, Daisuke Kuwahara, Marie SAKATA, HIROSHI AKATSUKA.  
Language English 
Journal/Book name
Japanese: 
English:Plasma and Fusion Research 
Volume, Number, Page Vol. 9    no. S2   
Published date July 29, 2014 
Publisher
Japanese:一般社団法人 プラズマ・核融合学会 
English:Japan Society of Plasma Science and Nuclear Fusion Research 
Conference name
Japanese: 
English:The 23rd International Toki Conference on Large-scale Simulation and Fusion Science 
Conference site
Japanese:土岐市 
English:Toki 
Official URL http://www.jspf.or.jp/PFR/PFR_articles/pfr2014S2/pfr2014_09-3406125.html
 
DOI https://doi.org/10.1585/pfr.9.3406125
Abstract Electric propulsion is an established high-efficiency method in deep space explorers. However, most of the applied methods feature electrodes in direct contact with the plasma, thus its lifetime is limited by the electrodes’ erosion. We developed electrodeless electric propulsion systems in order to overcome this problem, and performed optical measurements to estimate the high-density helicon plasma performance of the systems. The electron and neutral particle density profiles were measured by a high-speed camera, and the velocity of the singly-charged Ar ions was determined by a high-resolution monochromator. Additionally, a preliminary experiment of a spectroscopic method using an intensity ratio based on a collisional radiative model with a CCD monochromator was performed. The plasma parameters were in good agreement with the results obtained by an electrostatic probe, and the non-invasive optical measurements presented here can constitute an effective tool for evaluating an electric propulsion system.

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