Construction and Plasma Initiation of the Tokamak-Helical Hybrid Device TOKASTAR-2

• Published in: Plasma and Fusion Research Vol. 5; p. S2037
• Main Authors: OKANO, Koki, Yamazaki, Kozo, ARIMOTO, Hideki, OISHI, Tetsutarou, BABA, Kazuhisa, HASEGAWA, Makoto, SHOJI, Tatsuo
• Format: Journal Article
• Language: English
• Published: The Japan Society of Plasma Science and Nuclear Fusion Research 2010
• Subjects: ECH (electron cyclotron heating) plasma; OH (ohmic heating) plasma; one-turn voltage; Plasma current; tokamak-stellarator; TOKASTAR; TOSCA code
• DOI: 10.1585/pfr.5.S2037
• ISSN: 1880-6821

TOKASTAR, a hybrid magnetic configuration between tokamak and stellarator, has been proposed for the study of magnetic confinement optimization. The construction of the small device named TOKASTAR-2 was started in April 2008, and completed in March 2009. As a preliminary experiment, spatial distribution of electron temperature (Te) and electron density (ne) are measured in a simple toroidal magnetic field configuration. Initial ECH plasmas with Te ∼ 10 eV, ne ∼ 1016 m−3 are confirmed. In the preliminary experiment of ohmic heating plasma production, plasma current (Ip) of 25 A is observed. The plasma equilibrium is calculated by the TOSCA code, and the magnetic flux surface and optimal vertical field coil currents are clarified for the future experiment.