Locked modes and magnetic field errors in the Madison Symmetric Torus

A. F. Almagri, S. Assadi, S. C. Prager, J. S. Sarff, D. W. Kerst

Research output: Contribution to journalArticlepeer-review

78 Scopus citations


In the Madison Symmetric Torus (MST) reversed-field pinch [Fusion Technol. 19, 131 (1991)] magnetic oscillations become stationary (locked) in the lab frame as a result of a process involving interactions between the modes, sawteeth, and field errors. Several helical modes become phase locked to each other to form a rotating localized disturbance, the disturbance locks to an impulsive field error generated at a sawtooth crash, the error fields grow monotonically after locking (perhaps due to an unstable interaction between the modes and field error), and over tens of milliseconds of growth confinement degrades and the discharge eventually terminates. Field error control has been partially successful in eliminating locking.

Original languageEnglish (US)
Pages (from-to)4080-4085
Number of pages6
JournalPhysics of Fluids B
Issue number12
StatePublished - 1992

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • General Physics and Astronomy
  • Fluid Flow and Transfer Processes


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