Speaker
Dr
Tokihiko Tokuzawa
(National Institute for Fusion Science)
Description
As for studying the behavior of the turbulence affecting transport, the multi-scale interaction of turbulence between macro-, meso-, and micro-scale structures 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 several channel microwave Doppler reflectometer system [2, 3]. Recently, we succeeded in increasing the radial observation points of this Doppler reflectometer system up to 20 (or especially up to 60). The high sampling rate of 40 GS/s is utilized for the digital signal processing. tthe fine structure measurements by. 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. 15H02335, 15H02336, 17H01368, 26630474 and 25289342), 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. Additional support was provided by Japan/U.S. Cooperation in Fusion Research and Development.
Primary author
Dr
Tokihiko Tokuzawa
(National Institute for Fusion Science)
Co-authors
Dr
Akira Ejiri
(Tokyo Univ.)
Dr
Hiroshi Yamada
(National Institute for Fusion Science)
Dr
Katsumi Ida
(National Institute for Fusion Science)
Dr
Kenji Tanaka
(National Institute for Fusion Science)
Dr
Kiyomasa Watanabe
(National Institute for Fusion Science)
Dr
Shigeru Inagaki
(Kyushu Univ.)
