Observation of helical sawtooth oscillations in a tokamak

N. S. Brickhouse, T. H. Osborne, R. N. Dexter, S. C. Prager

Research output: Contribution to journalArticlepeer-review


In the Tokapole II tokamak [Nucl. Fusion 19, 1509 (1979)] the three-dimensional structure of the rapid sawtooth crash that accompanies internal disruptions has been observed. The sawtooth crash is helical, i.e., the decrease in soft x-ray intensity occurs along a q = 1 helical contour, in accord with the standard reconnection model. The poloidally asymmetric radial expansion of the crash inward from the q = 1 surface provides a measure of the reconnection time consistent with single helicity reconnection from a growing, nonrotating magnetic island.

Original languageEnglish (US)
Pages (from-to)3429-3431
Number of pages3
JournalPhysics of Fluids
Issue number11
StatePublished - 1985

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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