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It is shown that simple functional dependencies of transport coefficients on plasma parameters can result in a transition in the particle and energy confinement near the edge of a tokamak where particle sources and convection are important. This is illustrated using cylindrical classical diffusion coefficients. The transition may be to a second steady state or to a regime where there is no steady solution, for instance, in which the density rises continuously. In practice such a density rise would be curtailed by high radiated power or by instabilities. Many experimental observations of L- to H-mode transitions in tokamaks coincide with the non-steady solution rather than a bifurcation to a second steady state.

Additional information

Authors: WARD D J, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(93)77 EN (1993)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199311632 / Last updated on: 1994-11-28
Original language: en
Available languages: en