[Table of Contents]

Plasma and Fusion Research

Volume 8, 1205169 (2013)

Rapid Communications

Polarization-Controlled Multi-Pass Thomson Scattering System in the Tandem Mirror GAMMA 10
Masayuki YOSHIKAWA, Ryo YASUHARA1), Seito SAKAMOTO, Ryo SEKIGUCHI, Yoriko SHIMA, Junko KOHAGURA, Mizuki SAKAMOTO, Yousuke NAKASHIMA, Tsuyoshi IMAI, Makoto ICHIMURA, Ichihiro YAMADA1), Hisamichi FUNABA1), Kazuo KAWAHATA1) and Takashi MINAMI2)
Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
2)
Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
(Received 20 August 2013 / Accepted 5 November 2013 / Published 27 December 2013)

Abstract

An effective method to increase Thomson scattering (TS) signals is required in low-density plasmas. Multi-pass TS has the advantage of enhancing scattered signals. We constructed a double-pass TS system for a polarization-based system modelled on the GAMMA 10 TS system. In the second step, we have developed the multi-pass TS system based on the former double-pass TS system. In order to evaluate the effectiveness of the polarization-based configuration, the multi-pass system was installed in the GAMMA 10 TS system, which is capable of multi-pass scattering. We undertook Rayleigh scattering experiments. The integrated scattering signal was magnified to be approximately three times as large by using the multi-pass system with 6 passes.

Keywords

Thomson scattering, multi-pass, polarization-controlled, tandem mirror GAMMA 10

DOI: 10.1585/pfr.8.1205169

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This paper may be cited as follows:

Masayuki YOSHIKAWA, Ryo YASUHARA, Seito SAKAMOTO, Ryo SEKIGUCHI, Yoriko SHIMA, Junko KOHAGURA, Mizuki SAKAMOTO, Yousuke NAKASHIMA, Tsuyoshi IMAI, Makoto ICHIMURA, Ichihiro YAMADA, Hisamichi FUNABA, Kazuo KAWAHATA and Takashi MINAMI, Plasma Fusion Res. 8, 1205169 (2013).