Stable sustainment of plasmas with electron internal transport barrier by ECH in the LHD. (20th December 2017)

• Record Type: Journal Article
• Authors: Yoshimura, Y; Kasahara, H; Tokitani, M; Sakamoto, R; Ueda, Y; Marushchenko, N B; Seki, R; Kubo, S; Shimozuma, T; Igami, H; Takahashi, H; Tsujimura, T I; Makino, R; Kobayashi, S; Ito, S; Mizuno, Y; Okada, K; Akiyama, T; Tanaka, K; Tokuzawa, T; Yamada, I; Yamada, H; Mutoh, T; Takeiri, Y
• Other Names: collab.
• Is Part Of: Plasma physics and controlled fusion. Volume 60:Number 2(2018:Feb.)
• Publication Date: 2017-12-20
• Subjects: long pulse discharge -- electron cyclotron heating -- internal transport barrier -- LHD; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/1361-6587/aa9950
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: The long pulse experiments in the Large Helical Device has made progress in sustainment of improved confinement states. It was found that steady-state sustainment of the plasmas with improved confinement at the core region, that is, electron internal transport barrier (e-ITB), was achieved with no significant difficulty. Sustainment of a plasma having e-ITB with the line average electron density n e_ave of 1.1 × 10 19 m −3 and the central electron temperature T e0 of ∼3.5 keV for longer than 5 min only with 340 kW ECH power was successfully demonstrated.