title: Electron cyclotron beam measurement system in the Large Helical Device.
abstract: In order to evaluate the electron cyclotron (EC) heating power inside the Large Helical Device vacuum vessel and to investigate the physics of the interaction between the EC beam and the plasma, a direct measurement system for the EC beam transmitted through the plasma column was developed. The system consists of an EC beam target plate, which is made of isotropic graphite and faces against the EC beam through the plasma, and an IR camera for measuring the target plate temperature increase by the transmitted EC beam. This system is applicable to the high magnetic field (up to 2.75 T) and plasma density (up to 0.8 × 10(19) m(-3)). This system successfully evaluated the transmitted EC beam profile and the refraction.
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kamio
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Takahashi
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kubo
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Shimozuma
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Yoshimura
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Igami
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Ito
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kobayashi
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Mizuno
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Okada
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Osakabe
authors.affiliation: National Institute for Fusion Science, Toki 509-5292, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Mutoh