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ECCD Experiments Using the Upgraded Launching System in Heliotron J
Author(s) -
Nagasaki K.,
Sakamoto K.,
Minami K.,
Yoshino H.,
Mizuuchi T.,
Okada H.,
Hanatani K.,
Minami T.,
Masuda K.,
Kobayashi S.,
Yamamoto S.,
Konoshima S.,
Nakamura Y.,
Ohshima S.,
Mukai K.,
Kishi S.,
Lee H. Y.,
Takabatake Y.,
Motojima G.,
Yoshimura Y.,
Fernández A.,
Cappa Á.,
Blackwell B.,
Sano F.
Publication year - 2010
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.200900018
Subject(s) - cyclotron , physics , current (fluid) , electron , optics , perpendicular , computational physics , atomic physics , gaussian beam , beam (structure) , nuclear physics , geometry , mathematics , thermodynamics
Electron cyclotron current drive (ECCD) experiments have been made in Heliotron J by using an upgraded EC launching system. A focused Gaussian beam is injected with the parallel refractive index, N || , ranging from ‐0.05 to 0.6. Ray tracing calculation shows that the EC power is more localized than that in the previous launching system. In the initial ECCD experiment, the EC injection angle has been successfully scanned as designed. Comparison between perpendicular and oblique launching experiments shows that for standard configuration, the EC current of 1 kA is driven at N || ∼ 0.3 in the Fisch‐Boozer direction, and the bootstrap current flows up to 1 kA. A large increase in electron cyclotron emission (ECE) signals has been observed when the EC current was driven (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)