Conditions for up-down asymmetry in the core of tokamak equilibria

Paulo Rodrigues, Nuno F. Loureiro, Justin Ball, Felix I. Parra

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


A local magnetic equilibrium solution is sought around the magnetic axis in order to identify the key parameters defining the magnetic-surface's up-down asymmetry in the core of tokamak plasmas. The asymmetry is found to be determined essentially by the ratio of the toroidal current density flowing on axis to the fraction of the external field's odd perturbation that manages to propagate from the plasma boundary into the core. The predictions are tested and illustrated with experimentally relevant numerical equilibria. Hollow current-density distributions, and hence reverse magnetic shear, are seen to be crucial to bring into the core asymmetry values that are usually found only near the plasma edge.

Original languageEnglish (US)
Article number093003
JournalNuclear Fusion
Issue number9
StatePublished - Jul 30 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics


  • intrinsic rotation
  • reversed magnetic-shear configurations
  • up-down asymmetric equilibria


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