Plasma and Fusion Research
Volume 10, 3401057 (2015)
Regular Articles
- Tokyo University of Agriculture and Technology, 2-24-16 Naka-Cho, Koganei, Tokyo 184-8588, Japan
- 1)
- Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8550, Japan
- 2)
- Kyushu University, 6-1 Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan
Abstract
A particle flow velocity measurement is important to realize a behavior of exhausted plasma in an electric thruster. Laser-induced fluorescence (LIF) method provides flow velocities of ions and neutral particles through measuring velocity distribution functions of them. In addition, LIF method has some advantages, shown as follows; 1) high-spatial resolution, 2) absolute measurement of flow velocity, 3) direction-selectivity of velocity distribution functions. We have developed Ar I and Ar II LIF measuring system to observe spatial profiles of velocity distribution functions of both neutral particles and ions in an experimental device of the helicon plasma thruster, having permanent magnets as the applied magnetic field. Flow velocity of the neutral particle in the axial direction was subsonic, and ion velocity was related with a gradient of the magnetic field.
Keywords
high-density helicon plasma, laser-induced fluorescence, RF plasma, electric thruster, flow velocity
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This paper may be cited as follows:
Daisuke KUWAHARA, Yuriko TANIDA, Masaki WATANABE, Naoto TESHIGAHARA, Yukihiko YAMAGATA and Shunjiro SHINOHARA, Plasma Fusion Res. 10, 3401057 (2015).