Progress of divertor simulation research toward the realization of detached plasma using a large tandem mirror device

Nakashima, Yosuke*; Takeda, Hisahito*; Ichimura, Kazuya*; Hosoi, Katsuhiro*; Oki, Kensuke*; Sakamoto, Mizuki*; Hirata, Mafumi*; Ichimura, Makoto*; Ikezoe, Ryuya*; Imai, Tsuyoshi*; Iwamoto, Miki*; Hosoda, Yasunari*; Katanuma, Isao*; Kariya, Tsuyoshi*; Kigure, Satoshi*; Kohagura, Junko*; Minami, Ryutaro*; Numakura, Tomoharu*; Takahashi, Shigehito*; Yoshikawa, Masayuki*; Asakura, Nobuyuki; Fukumoto, Masakatsu; Hatayama, Akiyoshi*; Hirooka, Yoshihiko*; Kado, Shinichiro*; Kubo, Hirotaka; Masuzaki, Suguru*; Matsuura, Hiroto*; Nagata, Shinji*; Nishino, Nobuhiro*; Ono, Noriyasu*; Sagara, Akio*; Shikama, Tatsuo*; Shoji, Mamoru*; Tonegawa, Akira*; Ueda, Yoshio*

A divertor simulation experimental module (D-module) with a V-shaped divertor target is installed in the west end-sell in GAMMA 10 large tandem mirror device, and a hydrogen plasma irradiation experiment to the target have been started to investigate radiation cooling mechanism on the target. A gas injection system is installed in the D-module and Langmuir probe and calorie meter array are mounted on the target plate. During the plasma irradiation, the highest electron density of 2.4 10 m and a significant reduction of the electron temperature from a few tens of eV to 2 eV are achieved on the target plate by hydrogen and noble gas injection into the D-module.