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Abstract

Complex, non-linear systems generally exhibit phenomena which can be described, at least phenomenologically, as phase transition. Tokamak plasmas are no exception and the transition from the neo-Alcator to auxiliary heating phases is a good example of such behaviour. The loss rate in the auxiliary heating phase and the critical beta in the ohmic heating data are consistent with resistive MHD processes. However, the transition so sharp that local transport must be regulated by some global mechanism. This mechanics must reflect the dominance in tokamak plasmas of an unobserved phase transition associated with the shape of the electron temperature or current density profiles. A concerted experimental attack on the transition between the confinement phases would surely yield some insights into transport processes.

Additional information

Authors: THOMAS P R JET JOINT UNDERTAKING, ABINGDON (UK), JET JOINT UNDERTAKING, ABINGDON (UK)
Bibliographic Reference: 13TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA HEATING, SCHLIERSEE (GERMANY), APRIL 14-18, 1986 PP. 5-8 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK) MENTIONING REPORT JET-P(86)15, 1986
Record Number: 1989125011400 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en