Development of divertor simulation research in the GAMMA 10/PDX tandem mirror

Nakashima, Yosuke*; Sakamoto, Mizuki*; Yoshikawa, Masayuki*; Oki, Kensuke*; Takeda, Hisahito*; Ichimura, Kazuya*; Hosoi, Katsuhiro*; Hirata, Mafumi*; Ichimura, Makoto*; Ikezoe, Ryuya*; Imai, Tsuyoshi*; Kariya, Tsuyoshi*; Katanuma, Isao*; Kohagura, Junko*; Minami, Ryutaro*; Numakura, Tomoharu*; Wang, X.*; Iwamoto, Miki*; Hosoda, Yasunari*; 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*

In the large tandem mirror device GAMMA 10/PDX, a divertor simulation experimental module (D-module) with a V-shaped divertor target have been installed in the end-mirror. A massive gas injection of hydrogen and noble gases (argon and xenon) into the D-module during hydrogen plasma irradiation onto the target was performed, and plasma detachment from the target was investigated. Electron temperature measured by Langmuir probe array on the target was significantly reduced from a few tens of eV to 3 eV, and particle flux was also reduced. A bright H emission in the upstream region of the D-module and strong reduction near the target were observed by a two-dimensional image of H emission in the target observed with a high-speed camera. Molecular activated recombination (MAR) process is expected to contribute to the reduction of the electron temperature and the particle flux.