Electron cyclotron beam measurement system in the Large Helical Device

S Kamio; H Takahashi; S Kubo; T Shimozuma; Y Yoshimura; H Igami; S Ito; S Kobayashi; Y Mizuno; K Okada; M Osakabe; T Mutoh

doi:10.1063/1.4893432

Electron cyclotron beam measurement system in the Large Helical Device

Rev Sci Instrum. 2014 Nov;85(11):11E822. doi: 10.1063/1.4893432.

Authors

S Kamio¹, H Takahashi¹, S Kubo¹, T Shimozuma¹, Y Yoshimura¹, H Igami¹, S Ito¹, S Kobayashi¹, Y Mizuno¹, K Okada¹, M Osakabe¹, T Mutoh¹

Affiliation

¹ National Institute for Fusion Science, Toki 509-5292, Japan.

PMID: 25430387
DOI: 10.1063/1.4893432

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.