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Particle transport in magnetized plasmas is investigated with a fluid model of drift wave turbulence. An analytical calculation shows that magnetic field curvature and thermodiffusion drive an anomalous pinch. The curvature driven pinch velocity is consistent with the prediction of turbulence equipartition theory. The thermodiffusion flux is found to be directed inward for a small ratio of electron to ion pressure gradient, and it reverses its sign when increasing this ratio. Numerical simulations confirm that a turbulent particle pinch exists. It is mainly driven by curvature for equal ion and electron heat sources. The sign and relative weights of the curvature and thermodiffusion pinches are consistent with the analytical calculation.

Additional information

Authors: WEISEN H, Association Euratom-Confédération Suisse, CRPP, EPFL, Lausanne (CH);ANGIONI C, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Garching (DE);GARBET X, Association Euratom-CEA sur la Fusion, CEA Cadarache, St Paul-Lez-Durance (FR);GARZOTTI L, EURATOM-ENEA-CNR Association, Istituto Gas Ionizzati, Padova (IT);MANTICA P, Istituto di Fisica del Plasma CNR-EURATOM, Milano (IT);NORDMAN H, EFDA-JET, Culham Science Centre, Abingdon (GB);VALOVIC M, EURATOM/UKAEA, Culham Science Centre, Abingdon (GB)
Bibliographic Reference: An article published in: Physical Review Letters, 91, 035001 (18 July 2003)
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Record Number: 200316588 / Last updated on: 2003-08-21
Original language: en
Available languages: en