Experimental signatures of critically balanced turbulence in MAST

Y. C. Ghim, A. Schekochihin, A. R. Field, I. G. Abel, M. Barnes, G. Colyer, S. C. Cowley, F. I. Parra, D. Dunai, S. Zoletnik

Research output: Article

23 Citations (Scopus)

Abstract

Beam emission spectroscopy (BES) measurements of ion-scale density fluctuations in the MAST tokamak are used to show that the turbulence correlation time, the drift time associated with ion temperature or density gradients, the particle (ion) streaming time along the magnetic field, and the magnetic drift time are consistently comparable, suggesting a "critically balanced" turbulence determined by the local equilibrium. The resulting scalings of the poloidal and radial correlation lengths are derived and tested. The nonlinear time inferred from the density fluctuations is longer than the other times; its ratio to the correlation time scales as ν*i-0. 8±0.1, where ν*i=ion  ⠀Šcollision   rate/streaming   rate. This is consistent with turbulent decorrelation being controlled by a zonal component, invisible to the BES, with an amplitude exceeding those of the drift waves by ∼ν*i-0.8. Published by the American Physical Society.

Original languageEnglish
Article number145002
JournalPhysical Review Letters
Volume110
Issue number14
DOIs
Publication statusPublished - ápr. 1 2013

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turbulence
signatures
collision rates
ions
ion temperature
spectroscopy
temperature gradients
scaling
gradients
magnetic fields

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Ghim, Y. C., Schekochihin, A., Field, A. R., Abel, I. G., Barnes, M., Colyer, G., ... Zoletnik, S. (2013). Experimental signatures of critically balanced turbulence in MAST. Physical Review Letters, 110(14), [145002]. https://doi.org/10.1103/PhysRevLett.110.145002

Experimental signatures of critically balanced turbulence in MAST. / Ghim, Y. C.; Schekochihin, A.; Field, A. R.; Abel, I. G.; Barnes, M.; Colyer, G.; Cowley, S. C.; Parra, F. I.; Dunai, D.; Zoletnik, S.

In: Physical Review Letters, Vol. 110, No. 14, 145002, 01.04.2013.

Research output: Article

Ghim, YC, Schekochihin, A, Field, AR, Abel, IG, Barnes, M, Colyer, G, Cowley, SC, Parra, FI, Dunai, D & Zoletnik, S 2013, 'Experimental signatures of critically balanced turbulence in MAST', Physical Review Letters, vol. 110, no. 14, 145002. https://doi.org/10.1103/PhysRevLett.110.145002
Ghim YC, Schekochihin A, Field AR, Abel IG, Barnes M, Colyer G et al. Experimental signatures of critically balanced turbulence in MAST. Physical Review Letters. 2013 ápr. 1;110(14). 145002. https://doi.org/10.1103/PhysRevLett.110.145002
Ghim, Y. C. ; Schekochihin, A. ; Field, A. R. ; Abel, I. G. ; Barnes, M. ; Colyer, G. ; Cowley, S. C. ; Parra, F. I. ; Dunai, D. ; Zoletnik, S. / Experimental signatures of critically balanced turbulence in MAST. In: Physical Review Letters. 2013 ; Vol. 110, No. 14.
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