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Design and Installation of a New Electron Cyclotron Emission Diagnostic Antenna in LHD

Hayato TSUCHIYA, Yoshio NAGAYAMA, Kazuo KAWAHATA, Shigeru INAGAKI¹⁾, Shin KUBO and LHD Experiment Group

National Institute for Fusion Science, Toki 509-5292, Japan

1)

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

(Received 22 December 2010 / Accepted 19 May 2011 / Published 11 August 2011)

Abstract

A new electron cyclotron emission (ECE) antenna was designed and installed outside of torus, when the heating and diagnostics systems were reconfigured in LHD. Its design is based on Gaussian beam optics and consists of two plane and two concave mirrors. The mirror surfaces are defined using the concept of constant phase to improve matching to the corrugated waveguide. The new ECE antenna was used in a 2010 experiment to measure the electron temperature profile and its fluctuations.

Copyright (c) 2011 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

ECE, electron temperature, constant phase mirror, Gaussian beam, LHD

DOI: 10.1585/pfr.6.2402114

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References

• [1] Y. Nagayama, K. Kawahata, A. England, Y. Ito et al., Rev. Sci. Instrum. 70, 1021 (1999).
• [2] S. Kubo et al., Fusion Eng. Des. 26, 319 (1995).
• [3] P.F. Goldsmith, Quasioptical Systems (Wiley, New York, 1997).
• [4] M. Bornatici et al., Plasma. Phys. 23, 1127 (1981).
• [5] M. Sato et al., Rev. Sci. Instrum. 75, 3819 (2004).

This paper may be cited as follows:

Hayato TSUCHIYA, Yoshio NAGAYAMA, Kazuo KAWAHATA, Shigeru INAGAKI, Shin KUBO and LHD Experiment Group, Plasma Fusion Res. 6, 2402114 (2011).