Dependence of intrinsic rotation reversals on collisionality in MAST

J. C. Hillesheim, F. I. Parra, M. Barnes, N. A. Crocker, H. Meyer, W. A. Peebles, R. Scannell, A. Thornton

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Tokamak plasmas rotate even without external injection of momentum. A Doppler backscattering system installed at MAST has allowed this intrinsic rotation to be studied in ohmic L-mode and H-mode plasmas, including the first observation of intrinsic rotation reversals in a spherical tokamak. Experimental results are compared to a novel 1D model, which captures the collisionality dependence of the radial transport of toroidal angular momentum due to the effect of neoclassical flows on turbulent fluctuations. The model is able to accurately reproduce the change in sign of core toroidal rotation, using experimental density and temperature profiles from shots with rotation reversals as inputs and no free parameters fit to experimental data.

Original languageEnglish (US)
Article number032003
JournalNuclear Fusion
Volume55
Issue number3
DOIs
StatePublished - Mar 1 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Keywords

  • intrinsic rotation
  • reversals
  • tokamaks

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