Plasma and Fusion Research

Volume 15, 2402038 (2020)

Regular Articles

Measurement of Electron Temperature Profile and Fluctuation with ECE Radiometer System in Heliotron J
Maoyuan LUO, Kazunobu NAGASAKI1), Gavin WEIR2), Hiroyuki OKADA1), Takashi MINAMI1), Shinichiro KADO1), Shinji KOBAYASHI1), Satoshi YAMAMOTO1,3), Shinsuke OHSHIMA1), Tohru MIZUUCHI1), Shigeru KONOSHIMA1), Yuji NAKAMURA and Akihiro ISHIZAWA
Graduate School of Energy Science, Kyoto University, Uji 611-0011, Japan
1)
Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan
2)
Max-Planck Institute for Plasma Physics, Greifswald, Germany
3)
Naka Fusion Institute, National Institute and Radiological Science and Technology, Naka 311-0193, Japan
(Received 6 January 2020 / Accepted 27 April 2020 / Published 2 July 2020)

Abstract

A multi-channel electron cyclotron emission (ECE) radiometer system is being developed in Heliotron J to measure electron temperature (Te) profile and evaluate Te fluctuation. The conventional ECE part of this system includes 16 channels and can measure electron temperature profile from 58 GHz to 74 GHz which covers from the core to the edge region, and the correlation ECE part is composed of CECE-RF and CECE-IF sides. The signals from these two sides share a same source of electron cyclotron emission and thus are possible to estimate electron temperature fluctuation through correlation analysis. An ECE profile has been obtained and compared with data from Thomson scattering system in an electron cyclotron heated plasma. Electron temperature fluctuation levels were estimated in an ECH plasma using a cross-correlation function and a complex coherence function.

Keywords

fusion plasma, electron cyclotron emission, correlation ECE, electron temperature fluctuation

DOI: 10.1585/pfr.15.2402038

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