Test of tokamak low-mode-high-mode transition theory in stellarators

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Abstract

The tokamak L-H (low-mode-high mode) transition theory can be tested in stellarators in a controlled manner by making use of the two or more local maxima in poloidal viscosity in these devices. Depending on the relative magnitudes of the toroidal and helical components of the magnetic-field spectrum, the local maxima, and thus transition, can occur either at a critical poloidal ExB Mach number Mp of the order of unity, similar to that of a tokamak, or at an Mp of the order of |m-nq|/m, similar to that of a helically symmetric torus. Here, E(B) is the electric (magnetic) field strength, m (n) is the poloidal (toroidal) mode number of the helical component of the |B| spectrum, and q is the safety factor. Possible limitations on the test due to the effects of the charge-exchange momentum loss are discussed.

Original languageEnglish
Pages (from-to)3841-3843
Number of pages3
JournalPhysics of Fluids B
Volume5
Issue number11
DOIs
Publication statusPublished - 1993 Jan 1

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

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