Effect of Collisionality and Diamagnetism on the Plasma Dynamo

H. Ji; Y. Yagi; K. Hattori; A. F. Almagri; S. C. Prager; Y. Hirano; J. S. Sarff; T. Shimada; Y. Maejima; K. Hayase

doi:10.1103/PhysRevLett.75.1086

Effect of Collisionality and Diamagnetism on the Plasma Dynamo

H. Ji, Y. Yagi, K. Hattori, A. F. Almagri, S. C. Prager, Y. Hirano, J. S. Sarff, T. Shimada, Y. Maejima, and K. Hayase

Phys. Rev. Lett. 75, 1086 – Published 7 August 1995

Abstract

Fluctuation-induced dynamo electric fields are measured over a wide range of electron collisionality in the edge of TPE-1RM20 reversed-field pinch (RFP). In the collisionless region the magnetohydrodynamic dynamo alone can sustain the parallel current, while in the collisional region a new dynamo mechanism resulting from the fluctuations in the electron diamagnetic drift becomes dominant. A comprehensive picture of the RFP dynamo emerges by combining with earlier results from MST and REPUTE RFPs.

Received 1 May 1995

DOI:https://doi.org/10.1103/PhysRevLett.75.1086

Authors & Affiliations

H. Ji¹, Y. Yagi², K. Hattori², A. F. Almagri³, S. C. Prager³, Y. Hirano², J. S. Sarff³, T. Shimada², Y. Maejima², and K. Hayase²

¹Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, New Jersey 08543
²Plasma Section, Electrotechnical Laboratory, Tsukuba, Ibaraki 305, Japan
³Department of Physics, University of Wisconsin, Madison, Wisconsin 53706