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Abstract

A clear understanding of heat transport in a tokamak has continued to elude scientists for many years. One problem is the apparent insensitivity of the electron temperature profile in some experiments to changes in the heating profile. Various concepts have been put forward to explain this apparent insensitivity, such as profile consistency and resiliency and inward heat flows (pinches). More recently, it has been suggested that the variables that describe local transport are not just gradients of temperature and density but also some other, thus far unidentified, variable. In this paper an example of a pulse in which the temperature profile responds strongly to the heating profile is presented. Transport analysis of the pulse shows that a model, in which the heat flux is a function of the temperature gradient and other local parameters, would give an adequate description of the data for both negative and positive heat flux q, and no large non-diffusive flow terms would be required.

Additional information

Authors: CORDEY J G, JET Joint Undertaking, Abingdon, Oxon. (GB);BALET B, JET Joint Undertaking, Abingdon, Oxon. (GB);MUIR D, JET Joint Undertaking, Abingdon, Oxon. (GB);SCHMIDT G, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(92)04 (1992) 8 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199210751 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en