15-19 April 2018
Paradise Point Resort & Spa
America/Los_Angeles timezone

8.56 Microwave frequency comb Doppler reflectometer applying fast digital data acquisition system in LHD

17 Apr 2018, 16:00
1d 2h
Paradise Point Resort & Spa

Paradise Point Resort & Spa

1404 Vacation Rd, San Diego, CA 92109

Speakers

Tokihiko Tokuzawa (National Institute for Fusion Science) Hayato Tsuchiya (National Institute for Fusion Science) Shigeru Inagaki (Kyushu University) Katsumi Ida (National Institute for Fusion Science) Hiroshi Yamada (National Institute for Fusion Science) Akira Ejiri (The University of Tokyo) Kiyomasa Watanabe (National Institute for Fusion Science) Kazuki Oguri (Nagoya University) Tsuyoshi Akiyama (National Institute for Fusion Science) Kenji Tanaka (National Institute for Fusion Science) Ichihiro Yamada (National Institute for Fusion Science) LHD Experiment Group (National Institute for Fusion Science)

Description

As for studying the behavior of the turbulence affecting transport, the multi-scale turbulence interaction is receiving much attention at present. For this aim, higher spatial and temporal resolution diagnostics have been developed and applied in several devices [1]. In LHD, such the precise spatio-temporal behavior of turbulence flow velocity and intensity has been measured by the multi-channel microwave frequency comb Doppler reflectometer system [2, 3]. Recently, we succeeded in increasing the radial observation points of this Doppler reflectometer system up from 8 to 20 (or especially up to 60). The high sampling rate of 40 GS/s is utilized for the digital signal processing. The detail of the system and some topical results will be presented and the application technique will be discussed.
[1] T. Tokuzawa, Nuclear Fusion 57 (2017) 025001.
[2] T. Tokuzawa et al., Plasma Fusion Res. 9 (2014) 1402149.
[3] T. Tokuzawa et al., Phys. of Plasmas 21 (2014) 055904.
The present study was supported in part by KAKENHI (Nos. 17K18773, 17H01368, 15H02335, and 15H02336), by a budgetary Grant-in-Aid from the NIFS LHD project under the auspices of the NIFS Collaboration Research Program, and by Collaborative Research Program of RIAM of Kyushu University.

Primary author

Tokihiko Tokuzawa (National Institute for Fusion Science)

Co-authors

Hayato Tsuchiya (National Institute for Fusion Science) Shigeru Inagaki (Kyushu University) Katsumi Ida (National Institute for Fusion Science) Hiroshi Yamada (National Institute for Fusion Science) Akira Ejiri (The University of Tokyo) Kiyomasa Watanabe (National Institute for Fusion Science) Kazuki Oguri (Nagoya University) Tsuyoshi Akiyama (National Institute for Fusion Science) Kenji Tanaka (National Institute for Fusion Science) Ichihiro Yamada (National Institute for Fusion Science) LHD Experiment Group (National Institute for Fusion Science)

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