Plasma and Fusion Research

Volume 6, 1202133 (2011)

Rapid Communications

Development of a Double-Pass Thomson Scattering System in the TST-2 Spherical Tokamak

Junichi HIRATSUKA, Akira EJIRI, Makoto HASEGAWA¹⁾, Yoshihiko NAGASHIMA¹⁾, Yuichi TAKASE, Hiroshi TOJO²⁾, Takashi YAMAGUCHI, Takanori AMBO, Hidetoshi KAKUDA, Takuya SAKAMOTO, Ryota SHINO, Masateru SONEHARA, Takuma WAKATSUKI and Osamu WATANABE

: The University of Tokyo, Kashiwa 277-8561, Japan
1): Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
2): Japan Atomic Energy Agency, 801-1 Mukoyama, Naka-shi, Ibaraki 311-0193, Japan

(Received 14 July 2011 / Accepted 26 August 2011 / Published 16 September 2011)

Abstract

A double-pass Thomson scattering system, in which a laser pulse makes a round trip through the plasma, was constructed. Using the same optics and a fast detection unit, we can resolve backward and forward scattering pulses in the signal. Because these scatterings reflect velocity distribution along different directions, electron temperature anisotropy can be estimated from the double-pass Thomson scattering system.

Keywords

Thomson scattering, temperature anisotropy, forward-backward scattering, multi-pass, TST-2

DOI: 10.1585/pfr.6.1202133

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References

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[6] A. Ejiri et al., Plasma Fusion Res. 5, S2082 (2010).

This paper may be cited as follows:

Junichi HIRATSUKA, Akira EJIRI, Makoto HASEGAWA, Yoshihiko NAGASHIMA, Yuichi TAKASE, Hiroshi TOJO, Takashi YAMAGUCHI, Takanori AMBO, Hidetoshi KAKUDA, Takuya SAKAMOTO, Ryota SHINO, Masateru SONEHARA, Takuma WAKATSUKI and Osamu WATANABE, Plasma Fusion Res. 6, 1202133 (2011).