Absolute value measurement of ion-scale turbulence by two-dimensional phase contrast imaging in Large Helical Device

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  • Kinoshita, Toshiki
    Research Institute for Applied Mechanics, Kyushu University
  • Tanaka, K.
    National Institute for Fusion Science, National Institutes of Natural Sciences Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • Sakai, H.
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • Yanai, R.
    National Institute for Fusion Science, National Institutes of Natural Sciences
  • Nunami, M.
    National Institute for Fusion Science, National Institutes of Natural Sciences Graduate School of Science, Nagoya University
  • Michael, C.A.
    Department of Physics and Astronomy, University of California

Description

Absolute value measurements of turbulence amplitude in magnetically confined high-temperature plasmas can effectively explain turbulence-driven transport characteristics and their role in plasma confinements. Two-dimensional phase contrast imaging (2D-PCI) is a technique to evaluate the space-time spectrum of ion-scale electron density fluctuation. However, absolute value measurement of turbulence amplitude has not been conducted owing to the nonlinearity of the detector. In this study, the absolute measurement method proposed in the previous study is applied to turbulence measurement results in the large helical device. As a result, the localized turbulence amplitude at n_e = 1.5 × 10^<19> m^<-3> is approximately 3.5 × 10^<15> m^<-3>, which is 0.02% of the electron density. In addition, the evaluated poloidal wavenumber spectrum is almost consistent, within a certain error range, the spectrum being calculated using a nonlinear gyrokinetic simulation. This result is the first to the best of our knowledge to quantitatively evaluate turbulence amplitudes measured by 2D-PCI and compare with simulations.

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