Developments of frequency comb microwave reflectometer for the interchange mode observations in LHD plasma

Lhd Experiment Group

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We have upgraded the multi-channel microwave reflectometer system which uses a frequency comb as a source and measure the distribution of the density fluctuation caused by magneto-hydro dynamics instability. The previous multi-channel system was composed of the Ka-band, and the U-band system has been developed. Currently, the U-band system has eight frequency channels, which are 43.0, 45.0, 47.0, 49.0, 51.0, 53.0, 55.0, and 57.0 GHz, in U-band. Before the installation to the Large Helical Device (LHD), several tests for understanding the system characteristics, which are the phase responsibility, the linearity of output signal, and others, have been carried out. The in situ calibration in LHD has been done for the cross reference. In the neutral beam injected plasma experiments, we can observe the density fluctuation of the interchange mode and obtain the radial distribution of fluctuation amplitude.

Original languageEnglish
Article numberC02009
JournalJournal of Instrumentation
Volume11
Issue number2
DOIs
Publication statusPublished - Feb 3 2016

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microwave reflectometers
Plasma devices
Reflectometers
Interchanges
Microwave
Plasma
Microwaves
Calibration
Plasmas
Fluctuations
Experiments
Hydrodynamic Instability
neutral beams
radial distribution
installing
linearity
Linearity
Observation
output
Output

All Science Journal Classification (ASJC) codes

  • Mathematical Physics
  • Instrumentation

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Developments of frequency comb microwave reflectometer for the interchange mode observations in LHD plasma. / Lhd Experiment Group.

In: Journal of Instrumentation, Vol. 11, No. 2, C02009, 03.02.2016.

Research output: Contribution to journalArticle

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AU - Yamada, I.

AU - Inagaki, S.

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