[Table of Contents]

Plasma and Fusion Research

Volume 2, S1048 (2007)

Regular Articles

A Multi-Reflection Type Visible-Laser Interferometer for High Density Plasma Measurements
Kunihiko HATTORI, You NOGUCHI, Akira ANDO and Masaaki INUTAKE
Department of Electrical Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
(Received 2 December 2006 / Accepted 11 April 2007 / Published 20 November 2007)

Abstract

In order to measure a high density plasma more than 1020 m-3 in the vicinity of a magneto-plasma-dynamic arcjet (MPDA), a visible-laser interferometer is fabricated using a He-Ne laser (λ = 632.8 nm). As it doesn't have enough phase shift when the light passes through the MPDA plasma once, we adopt a multi-reflection optical system in this interferometer to improve the phase sensitivity. We measured a plasma density by the interferometer and estimated the maximum value of line-integrated density of 4 × 1019 m-2 . These experimental results are consistent with that of electrostatic probe measurement in the downstream region.

Keywords

laser interferometer, multi-reflection, magnet-plasma-dynamic arcjet, high density plasma, electron density measurement

DOI: 10.1585/pfr.2.S1048

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References

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This paper may be cited as follows:

Kunihiko HATTORI, You NOGUCHI, Akira ANDO and Masaaki INUTAKE, Plasma Fusion Res. 2, S1048 (2007).