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Abstract

In reversed-field pinches, two different mechanisms have been proposed to explain the dynamo process which drives the poloidal current needed to sustain the magnetic configuration: the kinetic dynamo theory and the magnetohydrodynamic (MHD) dynamo theory. Experimentally, they can be distinguished by the radial behavior of the electron distribution function. In this Letter the trajectory deflection of frozen hydrogen pellets has been used as a diagnostic of suprathermal electrons in the plasma. The classical Spitzer-Harm distortion of the electron distribution function consistent with the MHD dynamo electric field is found to give a better modeling of the pellet trajectory.

Additional information

Authors: GARZOTTI L, Association EURATOM-CEA sur la Fusion Controlee, C. E. Cadarache, 13108 Saint-Paul-lez-Durance, (FR);BARTIROMO R, Association EURATOM-CEA sur la Fusion Controlee, C. E. Cadarache, 13108 Saint-Paul-lez-Durance, (FR);INNOCENTE P, Association EURATOM-CEA sur la Fusion Controlee, C. E. Cadarache, 13108 Saint-Paul-lez-Durance, (FR);MARTINI S, Association EURATOM-CEA sur la Fusion Controlee, C. E. Cadarache, 13108 Saint-Paul-lez-Durance, (FR);PEGOURIE B, Consorzio RFX, Corso Stati Uniti 4, 35127 Padova (IT)
Bibliographic Reference: Article: Physical Review Letters, vol. 84 (2000) No 24, pp. 5532-5535
Record Number: 200012918 / Last updated on: 2000-12-18
Category: PUBLICATION
Original language: en
Available languages: en