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Mode-Content Analysis and Field Reconstruction of Propagating Waves in Corrugated Waveguides of an ECH System

Takashi SHIMOZUMA, Hiroshi IDEI¹⁾, Michael A. SHAPIRO²⁾, Richard J. TEMKIN²⁾, Shin KUBO, Hiroe IGAMI, Yasuo YOSHIMURA, Hiromi TAKAHASHI, Satoshi ITO, Sakuji KOBAYASHI, Yoshinori MIZUNO, Yasuyuki TAKITA and Takashi MUTOH

National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan

1)

Research Institute for Applied Mechanics Kyushu University, Kasuga, Fukuoka 816-8580, Japan

2)

Plasma Science and Fusion Center Massachusetts Institute of Technology, Cambridge, MA02139, USA

(Received 9 January 2009 / Accepted 11 May 2009 / Published 26 March 2010)

Abstract

A new method is proposed to analyze the mode content of high power electromagnetic waves that are propagating through corrugated waveguides in the electron cyclotron resonance heating (ECH) systems for nuclear fusion devices. The method was applied to the 168 GHz transmission line of the ECH system in the Large Helical Device (LHD) to evaluate the waveguide alignment. The mode content of the propagating waves could be accurately analyzed using this method. Furthermore, the wave field in the waveguide was reconstructed using the mode content information obtained for each mode.

Copyright (c) 2010 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

ECH, gyrotron, corrugated waveguide, mode analysis, phase retrieval

DOI: 10.1585/pfr.5.S1029

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References

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This paper may be cited as follows:

Takashi SHIMOZUMA, Hiroshi IDEI, Michael A. SHAPIRO, Richard J. TEMKIN, Shin KUBO, Hiroe IGAMI, Yasuo YOSHIMURA, Hiromi TAKAHASHI, Satoshi ITO, Sakuji KOBAYASHI, Yoshinori MIZUNO, Yasuyuki TAKITA and Takashi MUTOH, Plasma Fusion Res. 5, S1029 (2010).