Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
Regular Articles
Maximum Entropy Analysis of the 2D Density Turbulence Measured by MIR in TPE-RX
Zhongbing SHI, Yoshio NAGAYAMA, Soichiro YAMAGUCHI, Daisuke KUWAHARA, Tomokazu YOSHINAGA, Shoji SUGITO, Yoichi HIRANO, Haruhisa KOGUCHI, Satoru KIYAMA, Hajime SAKAKITA, Kiyoyuki YAMBE, Clive MICHAEL
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Keywords: turbulence, microwave imaging reflectometry, maximum entropy method
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2010 Volume 5 Pages S1019

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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.

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© 2010 by The Japan Society of Plasma Science and Nuclear Fusion Research
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