Plasma and Fusion Research

Volume 15, 2402064 (2020)

Regular Articles

Measurement of Radial Electric Field Using Doppler Reflectometer in High-Density Plasma of Heliotron J
Yasuto KONDO, Takeshi FUKUDA, Kazunobu NAGASAKI1), Hiroyuki OKADA1), Takashi MINAMI1), Shinichiro KADO1), Shinji KOBAYASHI1), Satoshi YAMAMOTO2), Shinsuke OHSHIMA1), Tohru MIZUUCHI1) and Takeshi TOMITA3)
Graduate School of Engineering, Osaka University, Suita 565-0871, Japan
1)
Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan
2)
National Institutes for Quantum and Radiological Science and Technology, Naka 311-0193, Japan
3)
Graduate School of Energy Science, Kyoto University, Uji 611-0011, Japan
(Received 26 December 2019 / Accepted 5 July 2020 / Published 1 September 2020)

Abstract

In this study, the radial electric field, Er, has been measured using a two-channel Doppler microwave reflectometer at high-density plasmas of the Heliotron J helical device. The experimental results show that Er grows negatively as the energy confinement is improved and the stored energy, Wp, is increased in a high-density plasma produced by neutral beam injection heating and high-intensity gas-puffing (HIGP). In a high-density plasma without HIGP, the Er radial structure in which the direction of the Er changes is measured.

Keywords

Doppler reflectometry, radial electric field, Heliotron J, high-intensity gas puff

DOI: 10.1585/pfr.15.2402064

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