Installation of New Electron Cyclotron Emission Imaging in LHD

Hayato TSUCHIYA; Daisuke KUWAHARA; Tokihiko TOKUZAWA; Yoshio NAGAYAMA; Yuki TAKEMURA; LHD Experiment Group

doi:10.1585/pfr.13.3402063

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Installation of New Electron Cyclotron Emission Imaging in LHD

Hayato TSUCHIYA, Daisuke KUWAHARA, Tokihiko TOKUZAWA, Yoshio NAGAYAMA, Yuki TAKEMURA, LHD Experiment Group

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Keywords: ECEI, LHD, multi horn antenna array, microwave optics

JOURNAL FREE ACCESS

2018 Volume 13 Pages 3402063

DOI https://doi.org/10.1585/pfr.13.3402063

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Abstract

A new electron cyclotron emission imaging antenna was designed and installed outside the torus on LHD. To improve the signal quality, we developed a local oscillator integrated antenna array (LIA), in which each channel has an internal local oscillation supply from a frequency-multiplier-integrated circuit. The labyrinth structure of the optical system comprises five mirrors to protect the LIA from plasma neutron emission. The initial results were obtained from the 2017 LHD experimental campaign. The MHD fluctuations and their fluctuation profiles were observed.

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