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Validation of the Digital Correlation ECE Measurement Technique using Low-Frequency Fluctuation in LHD

Hayato TSUCHIYA, Shigeru INAGAKI¹⁾, Tokihiko TOKUZAWA, Naoki TAMURA, Yoshio NAGAYAMA and LHD Experiment Group

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

1)

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

(Received 30 November 2015 / Accepted 14 March 2016 / Published 10 June 2016)

Abstract

We have proposed and developed a digital correlation ECE (DCECE) measurement method using a high-speed sampling digitizer. This is the first report of the validation of the DCECE using actual data of plasma. The experiment was conducted in the 18th cycle experiments in the large helical device (2014 fiscal year) and a several kHz electron temperature fluctuation was detected in the high ion temperature plasma. The results were compared to the conventional radiometer type ECE measurement. Moreover, it was found that the correlation profile depends on the analytical parameters of the IF conversion.

Copyright (c) 2016 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

ECE, direct sampling technique, correlation ECE, mesoscale phenomena, LHD

DOI: 10.1585/pfr.11.2402072

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References

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