Extension of the operational regime in high-temperature plasmas and the dynamic-transport characteristics in the LHD

作者：Takahashi H^*; Osakabe M; Nagaoka K; Murakami S; Yamada I; Takeiri Y; Yokoyama M; Lee H; Ida K; Seki R; Suzuki C; Yoshinuma M; Ido T; Shimizu A; Goto M; Morita S; Shimozuma T; Kubo S; Satake S; Matsuoka S; Tamura N; Tsuchiya H; Tanaka K; Nunami M; Wakasa A; Tsumori K; Ikeda K; Nakano H; Kisaki M; Yoshimura Y; Nishiura M; Igami H; Seki T; Kasahara H; Saito K; Kumazawa R; Muto S; Narihara K; Mutoh T; Kaneko O

来源：Nuclear Fusion, 2013, 53(7): 073034.

DOI：10.1088/0029-5515/53/7/073034

A central ion temperature of 7 keV in a neutral beam injection (NBI)-heated plasma and a central-electron temperature of 20 keV in an electron cyclotron resonance heating plasma were achieved in the Large Helical Device (LHD) using an upgraded heating system with a newly installed perpendicular-NB injector and gyrotrons. The values of T-i and T-e significantly exceeded 5.6 and 15 keV, obtained in previous experiments, respectively. High-T-i plasma was obtained using a carbon pellet injection and the kinetic-energy confinement improved by a factor of 1.5. Transport analysis of the high-T-i plasmas showed that the ion-thermal diffusivity and the viscosity were reduced after the pellet injection. Dynamic-transport analysis is applied and the transition to the ion-internal-transport barrier and back transition are discussed.

• 出版日期2013-7