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The entropy concept for the collective magnetic equilibria is applied to the description of the states of a tokamak subject to ohmic and auxiliary heating. The condition for the existence of steady-state plasma states with vanishing entropy production implies, on one hand, the resilience of specific current density profiles and, on the other, severe restrictions on the scaling of the confinement time with power and current. These restrictions are consistent with the Goldston scaling and with the existence of a heat pinch.

Additional information

Authors: MINARDI E, JET Joint Undertaking, Abingdon, Oxon. (GB);LAMPIS G, Istituto di Fisica del Plasma, Milano (IT)
Bibliographic Reference: Report: JET-R(89)10 EN (1989)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199010095 / Last updated on: 1994-12-01
Original language: en
Available languages: en