Helicity, relaxation, and dynamo in a laboratory plasma

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Scopus citations

Abstract

The toroidal laboratory plasma known as the reversed field pinch (RFP) is understood through magnetohydrodynamics to undergo an approximately helicity-conserving relaxation to a state which is near a minimum energy “Taylor state.” Experimental observation is consistent with this view. Measurements of the MHD dynamo (the alpha effect), obtained through various experimental measurements or inferences of the fluctuating plasma flow velocity, indicate that the MHD dynamo is active. Additional dynamo effects beyond the standard MHD model, such as pressure-driven or kinetic effects, are also under study experimentally, with some experimental support. However, the standard MHD model has motivated control experiments in which external adjustment of the mean fields leads to reduction in the fluctuation-induced relaxation and dynamo activity.

Original languageEnglish (US)
Title of host publicationMagnetic Helicity in Space and Laboratory Plasmas, 1999
PublisherBlackwell Publishing Ltd.
Pages55-63
Number of pages9
ISBN (Electronic)9781118664476
ISBN (Print)9780875900940
DOIs
StatePublished - Jan 1 1999
Externally publishedYes

Publication series

NameGeophysical Monograph Series
Volume111
ISSN (Print)0065-8448
ISSN (Electronic)2328-8779

All Science Journal Classification (ASJC) codes

  • Geophysics

Fingerprint Dive into the research topics of 'Helicity, relaxation, and dynamo in a laboratory plasma'. Together they form a unique fingerprint.

  • Cite this

    Prager, S. C. (1999). Helicity, relaxation, and dynamo in a laboratory plasma. In Magnetic Helicity in Space and Laboratory Plasmas, 1999 (pp. 55-63). (Geophysical Monograph Series; Vol. 111). Blackwell Publishing Ltd.. https://doi.org/10.1029/GM111p0055