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

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; Osamu WATANABE

doi:10.1585/pfr.6.1202133

Rapid Communications

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

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, Osamu WATANABE

Author information

Junichi HIRATSUKA
The University of Tokyo, Kashiwa 277-8561, Japan
Akira EJIRI
The University of Tokyo, Kashiwa 277-8561, Japan
Makoto HASEGAWA
Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
Yoshihiko NAGASHIMA
Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
Yuichi TAKASE
The University of Tokyo, Kashiwa 277-8561, Japan
Hiroshi TOJO
Japan Atomic Energy Agency, 801-1 Mukoyama, Naka-shi, Ibaraki 311-0193, Japan
Takashi YAMAGUCHI
The University of Tokyo, Kashiwa 277-8561, Japan
Takanori AMBO
The University of Tokyo, Kashiwa 277-8561, Japan
Hidetoshi KAKUDA
The University of Tokyo, Kashiwa 277-8561, Japan
Takuya SAKAMOTO
The University of Tokyo, Kashiwa 277-8561, Japan
Ryota SHINO
The University of Tokyo, Kashiwa 277-8561, Japan
Masateru SONEHARA
The University of Tokyo, Kashiwa 277-8561, Japan
Takuma WAKATSUKI
The University of Tokyo, Kashiwa 277-8561, Japan
Osamu WATANABE
The University of Tokyo, Kashiwa 277-8561, Japan

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

JOURNAL FREE ACCESS

2011 Volume 6 Pages 1202133

DOI https://doi.org/10.1585/pfr.6.1202133

Details

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.

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