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Sawtooth induced heat and density pulse measurements reported in the literature for the JET and TEXT experiments are considered. Whereas in JET the heat pulse travels ten times faster than the density pulse, 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 related to pressure rather than particle flux, the corresponding transport matrices are remarkably similar. Minor differences in this transport matrix between TEXT and JET account for the qualitative difference in the density pulses.

Additional information

Authors: SIPS A C C ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB);HOGEWEIJ G M D, FOM-Instituut voor Plasmafysica, Rijnhuizen, Nieuwegein (NL);LOPES CARDOZO N J, FOM-Instituut voor Plasmafysica, Rijnhuizen, Nieuwegein (NL);DE HAAS J C M, General Atomics, San Diego (US)
Bibliographic Reference: Report: JET-P(91)01 EN (1991) 11 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199110566 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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