Observation of the inward propagation of spontaneous toroidal flow from the plasma boundary in LHD

K. Kamiya, K. Ida, K. Itoh, Sanae Itoh, M. Yoshinuma, M. Yokoyama, S. Kubo, H. Tsuchiya, N. Tamura, S. Masuzaki, C. Suzuki, T. Akiyama

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Abstract

Spontaneous generation of toroidal flow from the separatrix and its inward radial propagation in association with the change in the electron temperature gradient have been observed near the plasma boundary in the modulated electron cyclotron heating (MECH) experiment in the Large Helical Device. The observations presented in this paper provide strongly the supports of the hypothesis for the conversion of the poloidal flow to the toroidal one at the plasma peripheral region, exhibiting a clear delay response on MECH in the time derivation of the toroidal flow (V ø ≡ ∂ V ø / ∂ t) to the poloidal one (V θ ≡ ∂ V θ / ∂ t) at a normalized radius of ρ ≈ 0.97. The ratio of order unity for | V ø / V θ | during a conversion phase from poloidal flow into toroidal one is consistent with that predicted by a quasi-stationary theoretical model based on the turbulent instability, regardless of its sign and spatial structure. The present work demonstrates a new dynamic response in the plasma momentum transport and represents a significant confirmation of its non-local nature.

Original languageEnglish
Article number102309
JournalPhysics of Plasmas
Volume23
Issue number10
DOIs
Publication statusPublished - Oct 1 2016

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electron cyclotron heating
propagation
dynamic response
unity
temperature gradients
derivation
electron energy
momentum
radii

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Kamiya, K., Ida, K., Itoh, K., Itoh, S., Yoshinuma, M., Yokoyama, M., ... Akiyama, T. (2016). Observation of the inward propagation of spontaneous toroidal flow from the plasma boundary in LHD. Physics of Plasmas, 23(10), [102309]. https://doi.org/10.1063/1.4965908

Observation of the inward propagation of spontaneous toroidal flow from the plasma boundary in LHD. / Kamiya, K.; Ida, K.; Itoh, K.; Itoh, Sanae; Yoshinuma, M.; Yokoyama, M.; Kubo, S.; Tsuchiya, H.; Tamura, N.; Masuzaki, S.; Suzuki, C.; Akiyama, T.

In: Physics of Plasmas, Vol. 23, No. 10, 102309, 01.10.2016.

Research output: Contribution to journalArticle

Kamiya, K, Ida, K, Itoh, K, Itoh, S, Yoshinuma, M, Yokoyama, M, Kubo, S, Tsuchiya, H, Tamura, N, Masuzaki, S, Suzuki, C & Akiyama, T 2016, 'Observation of the inward propagation of spontaneous toroidal flow from the plasma boundary in LHD', Physics of Plasmas, vol. 23, no. 10, 102309. https://doi.org/10.1063/1.4965908
Kamiya, K. ; Ida, K. ; Itoh, K. ; Itoh, Sanae ; Yoshinuma, M. ; Yokoyama, M. ; Kubo, S. ; Tsuchiya, H. ; Tamura, N. ; Masuzaki, S. ; Suzuki, C. ; Akiyama, T. / Observation of the inward propagation of spontaneous toroidal flow from the plasma boundary in LHD. In: Physics of Plasmas. 2016 ; Vol. 23, No. 10.
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