Plasma Confinement and Behavior of Plasmas in the Minimum-B Region of the GAMMA 10 Tandem Mirro

Yousuke NAKASHIMA; Kiyoshi YATSU; Khairul ISLAM; Daisuke SATO; Atsushi WADA; Kameo ISHII; Akiyosi ITAKURA; Makoto ICHIMURA; Isao KATANUMA; Ken KAJIWARA; Shigeyuki KUBOTA; Junko KOHAGURA; Shinji KOBAYASHI; Teruo SAITO; Takeshi SASUGA; Yoshinori TATEMATSU; Teruo TAMANO; Teruji CHO; Tokihiko TOKUZAWA; Yuki NISHIZAWA; Minoru HAMADA; Ryuta BABA; Mafumi HIRATA; Leonid BRUSKIN; Hitoshi HOJO; Atsushi MASE; Ryutaro MINAMI; Masayuki YOSHIKAWA

doi:10.1585/jspf.75.1211

Yousuke NAKASHIMA, Kiyoshi YATSU, Khairul ISLAM, Daisuke SATO, Atsushi WADA, Kameo ISHII, Akiyosi ITAKURA, Makoto ICHIMURA, Isao KATANUMA, Ken KAJIWARA, Shigeyuki KUBOTA, Junko KOHAGURA, Shinji KOBAYASHI, Teruo SAITO, Takeshi SASUGA, Yoshinori TATEMATSU, Teruo TAMANO, Teruji CHO, Tokihiko TOKUZAWA, Yuki NISHIZAWA, Minoru HAMADA, Ryuta BABA, Mafumi HIRATA, Leonid BRUSKIN, Hitoshi HOJO, Atsushi MASE, Ryutaro MINAMI, Masayuki YOSHIKAWA

Author information

Yousuke NAKASHIMA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Kiyoshi YATSU
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Khairul ISLAM
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Daisuke SATO
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Atsushi WADA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Kameo ISHII
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Akiyosi ITAKURA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Makoto ICHIMURA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Isao KATANUMA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Ken KAJIWARA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Shigeyuki KUBOTA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Junko KOHAGURA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Shinji KOBAYASHI
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Teruo SAITO
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Takeshi SASUGA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Yoshinori TATEMATSU
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Teruo TAMANO
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Teruji CHO
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Tokihiko TOKUZAWA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Yuki NISHIZAWA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Minoru HAMADA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Ryuta BABA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Mafumi HIRATA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Leonid BRUSKIN
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Hitoshi HOJO
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Atsushi MASE
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Ryutaro MINAMI
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan
Masayuki YOSHIKAWA
Plasma Research Center,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan

Keywords: tandem mirror, GAMMA 10, potential confinement, conductiong plate, minimum-B field, edge plasma, Langmuir probe

JOURNAL FREE ACCESS

1999 Volume 75 Issue 10 Pages 1211-1218

DOI https://doi.org/10.1585/jspf.75.1211

Details

Abstract

Recent results of the plasma confinement and the behavior of the edge plasma in the minimum-B regions of the GAMMA 10 tandem mirror are described. In this experiment conducting plates are newly installed in the anchor-cells in order to improve the performance of plasma confinement. The conducting plates are fixed closely to the plasma surface where the cross-section of the plasma is flatly e]elongated in the anchor transition region. After conditioning the conducting plates, basic characteristics on the conducting plates are investigated. A fairly good symmetry between the two plates facing each other is found in the drain current and in the floating potential. The axial profiles of these measured data also show a symmetry with respect to the central-cell mid plane. The dependence of the resistance connecting the plates to the machine ground shows that the floating condition of the plates provides the better property of particle confinement. As the result of optimization of the heating and gas puffing systems a s significant improvement of the plasma parameters is observed during potential formation. According to the increase of plug ECRH power, the central-cell line density and the diamagnetism increase and both parameters are nearly doubled at the ECRH power of 140kW under the floating condition of the conducting plates.

Corresponding author

Register with J-STAGE for free!