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Flow damping due to stochastization of the magnetic field

Author

Listed:
  • K. Ida

    (National Institute for Fusion Science)

  • M. Yoshinuma

    (National Institute for Fusion Science)

  • H. Tsuchiya

    (National Institute for Fusion Science)

  • T. Kobayashi

    (National Institute for Fusion Science)

  • C. Suzuki

    (National Institute for Fusion Science)

  • M. Yokoyama

    (National Institute for Fusion Science)

  • A. Shimizu

    (National Institute for Fusion Science)

  • K. Nagaoka

    (National Institute for Fusion Science)

  • S. Inagaki

    (Research Institute for Applied Mechanics, Kyushu University)

  • K. Itoh

    (National Institute for Fusion Science)

Abstract

The driving and damping mechanism of plasma flow is an important issue because flow shear has a significant impact on turbulence in a plasma, which determines the transport in the magnetized plasma. Here we report clear evidence of the flow damping due to stochastization of the magnetic field. Abrupt damping of the toroidal flow associated with a transition from a nested magnetic flux surface to a stochastic magnetic field is observed when the magnetic shear at the rational surface decreases to 0.5 in the large helical device. This flow damping and resulting profile flattening are much stronger than expected from the Rechester–Rosenbluth model. The toroidal flow shear shows a linear decay, while the ion temperature gradient shows an exponential decay. This observation suggests that the flow damping is due to the change in the non-diffusive term of momentum transport.

Suggested Citation

  • K. Ida & M. Yoshinuma & H. Tsuchiya & T. Kobayashi & C. Suzuki & M. Yokoyama & A. Shimizu & K. Nagaoka & S. Inagaki & K. Itoh, 2015. "Flow damping due to stochastization of the magnetic field," Nature Communications, Nature, vol. 6(1), pages 1-7, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms6816
    DOI: 10.1038/ncomms6816
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