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Development of 2D Laser-Induced Fluorescence (LIF) System in High-Density Helicon Plasma

Naoto TESHIGAHARA, Shunjiro SHINOHARA, Yukihiko YAMAGATA¹⁾, Daisuke KUWAHARA and Masaki WATANABE

Tokyo University of Agriculture and Technology, 2-24-16 Naka-Cho, Koganei, Tokyo 184-8588, Japan

1)

Kyushu University, 6-1 Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan

(Received 18 November 2013 / Accepted 11 March 2014 / Published 10 June 2014)

Abstract

Lifetimes of most electric propulsion devices are limited owing to electrode erosion and contamination by plasmas. To overcome this problem, a Helicon Electrodeless Advanced Thruster (HEAT) was proposed by our research team. This scheme employs a high-density (∼ 10¹³ cm⁻³) helicon plasma accelerated by the Lorentz force, which is produced by various acceleration methods. For feasibility of this method, a Laser-Induced Fluorescence (LIF) system was developed. The LIF is a powerful tool for plasma diagnostics because it is a non-invasive method that allows high spatial resolution. Using the LIF, it is possible to deduce velocity distribution functions of different particles (ions, atoms, and molecules). In this paper, we report the details of our novel 2D LIF system as well as some preliminary experimental results. Argon ion velocity distributions at different axial and radial locations were obtained using the novel 2D system. Ion velocity was greatest (∼ 2.8 km/s) at z = −24 cm among all the points measured along the z-axis. Velocity values were approximately 2.7 and 3.2 km/s for radial positions of r = 0 and 3 cm, respectively. Ion temperature values were approximately 0.56 and 0.61 eV at r = 0 and 3 cm, respectively.

Copyright (c) 2014 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

helicon plasma, electrodeless, high-density, laser induced fluorescence, two dimensional measurements

DOI: 10.1585/pfr.9.3406055

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References

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This paper may be cited as follows:

Naoto TESHIGAHARA, Shunjiro SHINOHARA, Yukihiko YAMAGATA, Daisuke KUWAHARA and Masaki WATANABE, Plasma Fusion Res. 9, 3406055 (2014).