Resolving Apparent Differences between Heat and Density Pulse-Propagation in Jet and Text

TitleResolving Apparent Differences between Heat and Density Pulse-Propagation in Jet and Text
Publication TypeJournal Article
Year of Publication1991
AuthorsA.C.C. Sips, G.MD Hogeweij, A.E Costley, J. Orourke, N.JL Cardozo, J.CM Dehaas
JournalNuclear Fusion
Volume31
Number8
Pagination1545-1550
Date PublishedAug
ISBN Number0029-5515
Abstract

Sawtooth induced heat and density pulse measurements reported in the literature for the JET and TEXT experiments are discussed. In JET the heat pulse travels ten times faster than the density pulse, but in TEXT both pulses travel at the same speed. The measurements are analysed using coupled transport equations for energy and particles. It is shown that the different behaviour of the density pulse in the two experiments can be attributed to differences in the off-diagonal elements of the transport matrix. If the perturbed fluxes of heat and particles are expressed as linear combinations of the thermodynamic forces del p and del T (rather than del n and del T), the corresponding transport matrices are remarkably similar. However, minor differences in this transport matrix between JET and TEXT account for the qualitative difference in the density pulses.

DOI10.1088/0029-5515/31/8/014
PID

19547e46ce640a1902d4a9b7e95f8d7a

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