title: First results of electron temperature measurements by the use of multi-pass Thomson scattering system in GAMMA 10.
abstract: A multi-pass Thomson scattering (TS) has the advantage of enhancing scattered signals. We constructed a multi-pass TS system for a polarisation-based system and an image relaying system modelled on the GAMMA 10 TS system. We undertook Raman scattering experiments both for the multi-pass setting and for checking the optical components. Moreover, we applied the system to the electron temperature measurements in the GAMMA 10 plasma for the first time. The integrated scattering signal was magnified by approximately three times by using the multi-pass TS system with four passes. The electron temperature measurement accuracy is improved by using this multi-pass system.
authors.affiliation: Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yoshikawa
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Yasuhara
authors.affiliation: Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Nagasu
authors.affiliation: Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Shimamura
authors.affiliation: Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Shima
authors.affiliation: Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Kohagura
authors.affiliation: Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Sakamoto
authors.affiliation: Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nakashima
authors.affiliation: Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Imai
authors.affiliation: Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Ichimura
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan.
authors.forename: I
authors.initials: I
authors.lastname: Yamada
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Funaba
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kawahata
authors.affiliation: Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Minami