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Abstract

Simple considerations allow to derive a transport coefficient X-ePC that we regard as being "genuinely PC". In comparison, coefficients derived are to be considered as "quasi-PC". A particular choice of X-ePC has been successfully tested in the simulation of JET discharges. Our analysis shows that the success of X-eCMG = X-ePC in simulating ohmic discharges in completely different devices can be explained by: 1) the underlying "canonical profile" is close to reality and no strong change of alpha is needed in different cases: 2) a "hidden" scaling is introduced in computations using X-eCMG when the boundary value of T-e is changed. This aspect has always been disregarded in the past. Choices other than (2), possibly less optimistic, are however possible for the "canonical profile", leading to other expressions for X-ePC. In the absence of a quantitative theory and of more detailed experimental observations on PC, our analysis and results are to be considered only as indications that transport models can be modified to introduced the constraint of PC. This must and can be done taking into account appropriate models for the central and the boundary plasma region.

Additional information

Authors: TARONI A, JET JOINT UNDERTAKING, ABINGDON (UK);TIBONE F 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. 17-20 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK) MENTIONING REPORT JET-P(86)15, 1986
Record Number: 1989125010500 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en