Observations of high-beta toroidal plasmas

J. H. Halle, A. G. Kellman, R. S. Post, S. C. Prager, E. J. Strait, M. C. Zarnstorff

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


A wide range of magnetohydrodynamically stable high-β plasmas is produced in the University of Wisconsin Levitated Toroidal Octupole. Near the single-fluid regime we obtain, in the bad-curvature region, β=nk(Te+Ti)8πB28%, twice the theoretical single-fluid ballooning instability limit of 4%. We also obtain stable plasmas at β=35%, nine times the theoretical limit, in a regime in which finite-ion-gyroradius (e.g., gyroviscosity) effects are important. Experimental spatial profiles of the equilibrium diamagnetism are compared with theory.

Original languageEnglish (US)
Pages (from-to)1394-1397
Number of pages4
JournalPhysical review letters
Issue number21
StatePublished - 1981

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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