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The determination of transport coefficients from the evolution of transient perturbations is an area of active research in tokamak physics. Recently, considerable effort has been devoted to the simultaneous measurement of electron density and temperature perturbations and to the analysis of these perturbations in terms of coupled transport equations. Analytic solutions of these equations are of interest because they can provide physical insights which are not afforded by numerical simulations and because they can reduce the computer time required to analyse data. A common feature of the analytic and semi-analytic techniques which have been published is that the solution is restricted to spatial (or temporal) regions in which the perturbed sources vanish. In this report the evolution of perturbations in the presence of non-vanishing harmonic perturbations of the particle and heat sources is considered. The solution is elaborated and the validity of far-field approximations for the analysis of modulation experiments is discussed.

Additional information

Authors: O'ROURKE J, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(92)40 EN (1992) 12 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199211287 / Last updated on: 1994-11-29
Original language: en
Available languages: en
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