Plasma and Fusion Research

Volume 10, 1202088 (2015)

Rapid Communications

Preliminary Measurements of Low Frequency Fluctuations by a Microwave Interferometer System and a Fast Camera in Pilot-PSI Device

Masayuki YOSHIKAWA, Hennie Van Der MEIDEN¹⁾, Richard AL¹⁾, Kirill BYSTROV¹⁾, Jordy VERNIMMEN¹⁾, Junko KOHAGURA, Yoriko SHIMA, Xiaolong WANG, Makoto ICHIMURA, Mizuki SAKAMOTO and Yousuke NAKASHIMA

: Plasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
1): FOM Institute DIFFER - Dutch Institute for Fundamental Energy Research, Partner in the Trilateral Euregio Cluster, the Netherlands

(Received 15 June 2015 / Accepted 12 October 2015 / Published 28 December 2015)

Abstract

Pilot-PSI is a magnetized linear plasma device designed for investigating the plasma-surface interactions at ITER-relevant parameters. A frequency-multiplied microwave interferometer system was installed on the Pilot-PSI device for preliminary measurements in the divertor-relevant plasma. We report measurements of the electron line integrated density and its fluctuations. The Hα line emission was monitored using a fast visible camera and was compared with the interferometer data. Both diagnostics measured similar fluctuation frequencies. This suggests that the fluctuations of ions and electrons are well coupled in Pilot-PSI, at least in the plasma regime that was investigated.

Keywords

electron line integrated density, density fluctuation, microwave interferometer, Pilot-PSI

DOI: 10.1585/pfr.10.1202088

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This paper may be cited as follows:

Masayuki YOSHIKAWA, Hennie Van Der MEIDEN, Richard AL, Kirill BYSTROV, Jordy VERNIMMEN, Junko KOHAGURA, Yoriko SHIMA, Xiaolong WANG, Makoto ICHIMURA, Mizuki SAKAMOTO and Yousuke NAKASHIMA, Plasma Fusion Res. 10, 1202088 (2015).