title: High time resolved electron temperature measurements by using the multi-pass Thomson scattering system in GAMMA 10/PDX.
abstract: High time resolved electron temperature measurements are useful for fluctuation study. A multi-pass Thomson scattering (MPTS) system is proposed for the improvement of both increasing the TS signal intensity and time resolution. The MPTS system in GAMMA 10/PDX has been constructed for enhancing the Thomson scattered signals for the improvement of measurement accuracy. The MPTS system has a polarization-based configuration with an image relaying system. We optimized the image relaying optics for improving the multi-pass laser confinement and obtaining the stable MPTS signals over ten passing TS signals. The integrated MPTS signals increased about five times larger than that in the single pass system. Finally, time dependent electron temperatures were obtained in MHz sampling.
authors.affiliation: Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yoshikawa
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan.
authors.forename: Ryo
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: Koichi
authors.initials: K
authors.lastname: Ohta
authors.affiliation: Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Chikatsu
authors.affiliation: Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: Yoriko
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: Junko
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: Mizuki
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: Yousuke
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: Tsuyoshi
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: Makoto
authors.initials: M
authors.lastname: Ichimura
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan.
authors.forename: Ichihiro
authors.initials: I
authors.lastname: Yamada
authors.affiliation: National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan.
authors.forename: Hisamichi
authors.initials: H
authors.lastname: Funaba
authors.affiliation: Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Minami