Quasi 3D ECE imaging system for study of MHD instabilities in KSTAR

G S Yun; W Lee; M J Choi; J Lee; M Kim; J Leem; Y Nam; G H Choe; H K Park; H Park; D S Woo; K W Kim; C W Domier; N C Luhmann Jr; N Ito; A Mase; S G Lee

doi:10.1063/1.4890401

Quasi 3D ECE imaging system for study of MHD instabilities in KSTAR

Rev Sci Instrum. 2014 Nov;85(11):11D820. doi: 10.1063/1.4890401.

Authors

G S Yun¹, W Lee², M J Choi¹, J Lee¹, M Kim¹, J Leem¹, Y Nam¹, G H Choe¹, H K Park², H Park³, D S Woo³, K W Kim³, C W Domier⁴, N C Luhmann Jr⁴, N Ito⁵, A Mase⁶, S G Lee⁷

Affiliations

¹ Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
² Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea.
³ School of Electrical Engineering, Kyungpook National University, Daegu 702-701, Korea.
⁴ Department of Electrical and Computer Engineering, University of California, Davis, California 95616, USA.
⁵ KASTEC, Kyushu University, Kasuga-shi, Fukuoka 812-8581, Japan.
⁶ Ube National College of Technology, Ube-shi, Yamaguchi 755-8555, Japan.
⁷ National Fusion Research Institute, Daejeon 305-333, Korea.

PMID: 25430233
DOI: 10.1063/1.4890401

Abstract

A second electron cyclotron emission imaging (ECEI) system has been installed on the KSTAR tokamak, toroidally separated by 1/16th of the torus from the first ECEI system. For the first time, the dynamical evolutions of MHD instabilities from the plasma core to the edge have been visualized in quasi-3D for a wide range of the KSTAR operation (B0 = 1.7∼3.5 T). This flexible diagnostic capability has been realized by substantial improvements in large-aperture quasi-optical microwave components including the development of broad-band polarization rotators for imaging of the fundamental ordinary ECE as well as the usual 2nd harmonic extraordinary ECE.