Measurement Of Electron Temperature Profile And Fluctuation With Ece Radiometer System In Heliotron J

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. (C) 2020 The Japan Society of Plasma Science and Nuclear Fusion Research