Large helical device

Kaneko, O.

doi:10.1016/b978-0-08-100315-2.00015-5

Cited by 1 publication

(1 citation statement)

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“…When some frequency components of the microwave launch simultaneously, each frequency component reflects back at each corresponding different cut-off position and gives the radial profile. For these reasons, we have developed a multi-channel microwave reflectometer system in the Large Helical Device (LHD) [5]. In particular, this system uses a frequency comb as a source.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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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.

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Section: Introductionmentioning

confidence: 99%