[Table of Contents]

Plasma and Fusion Research

Volume 5, S1019 (2010)

Regular Articles

Maximum Entropy Analysis of the 2D Density Turbulence Measured by MIR in TPE-RX
Zhongbing SHI, Yoshio NAGAYAMA1), Soichiro YAMAGUCHI2), Daisuke KUWAHARA3), Tomokazu YOSHINAGA1), Shoji SUGITO1), Yoichi HIRANO4), Haruhisa KOGUCHI4), Satoru KIYAMA4), Hajime SAKAKITA4), Kiyoyuki YAMBE4) and Clive MICHAEL5)
The Graduate University for Advanced Studies, Toki 509-5292, Japan
1)
National Institute for Fusion Science, Toki 509-5292, Japan
2)
Kansai University, Suita 564-8680, Japan
3)
Department of Energy Science, Tokyo Institute of Technology, Tokyo 152-8550, Japan
4)
Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan
5)
UKAEA, Abingdon, Oxfordshire OX14 3DB, United Kingdom
(Received 9 January 2009 / Accepted 22 May 2009 / Published 26 March 2010)

Abstract

Two-dimensional (2D) turbulence measurement by using microwave imaging reflectometry (MIR) has been performed in the reversed field pinch (RFP) plasma in TPE-RX. In this work, the maximum entropy method (MEM) is used to estimate the 2D k-spectrum. The turbulences between the pulsed poloidal current drive (PPCD) and the high Θ plasmas are studied. The m = 1 modes are dominant in PPCD plasma, while in high Θ plasma the k spectrum expands to the high k range and the turbulence propagates in the electron drift direction. The preliminary result shows that PPCD plasma switches off the turbulence, and the high Θ plasma has strong turbulence.

Keywords

turbulence, microwave imaging reflectometry, maximum entropy method

DOI: 10.1585/pfr.5.S1019

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This paper may be cited as follows:

Zhongbing SHI, Yoshio NAGAYAMA, Soichiro YAMAGUCHI, Daisuke KUWAHARA, Tomokazu YOSHINAGA, Shoji SUGITO, Yoichi HIRANO, Haruhisa KOGUCHI, Satoru KIYAMA, Hajime SAKAKITA, Kiyoyuki YAMBE and Clive MICHAEL, Plasma Fusion Res. 5, S1019 (2010).