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Title: Homogeneous dynamos: Theory and practice

Abstract

The magnetism of many naturally occurring bodies is attributed to the motion of conducting fluids in their interiors. Although the physical principles underlying such self-excited dynamos are identical to those governing an electric generator in a power station, they (unlike the commercial machine) operate in a simple homogeneous body of conductor, and are therefore less easily excited. The theory of such homogeneous dynamos'' is adumbrated here, and past attempts to construct working laboratory models are reviewed. Consideration is given to the possibility of conducting a turbulent homogeneous dynamo experiment in liquid sodium. The proposed configuration is a crude representation of the simplest of all theoretical dynamo models, that of Ponomarenko [J. Appl. Mech. Tech. Phys. [bold 14], 755 (1972)]. In addition to demonstrating for the first time a homogeneous magnetohydrodynamic (MHD) dynamo in the laboratory, the experiment should enhance understanding of MHD turbulence, and provide insight into how the field generation process saturates.

Authors:
 [1];  [2]
  1. (Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California 90024 (United States))
  2. (General Atomics, San Diego, California 92186 (United States))
Publication Date:
OSTI Identifier:
6483672
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Journal Article
Journal Name:
Physics of Fluids B; (United States)
Additional Journal Information:
Journal Volume: 5:7; Journal ID: ISSN 0899-8221
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; GEOMAGNETIC FIELD; MAGNETOHYDRODYNAMICS; ELECTRIC CONDUCTORS; SODIUM; TURBULENT FLOW; ALKALI METALS; ELEMENTS; FLUID FLOW; FLUID MECHANICS; HYDRODYNAMICS; MAGNETIC FIELDS; MECHANICS; METALS; 700370* - Plasma Fluid & MHD Properties- (1992-)

Citation Formats

Roberts, P.H., and Jensen, T.H. Homogeneous dynamos: Theory and practice. United States: N. p., 1993. Web. doi:10.1063/1.860703.
Roberts, P.H., & Jensen, T.H. Homogeneous dynamos: Theory and practice. United States. doi:10.1063/1.860703.
Roberts, P.H., and Jensen, T.H. Thu . "Homogeneous dynamos: Theory and practice". United States. doi:10.1063/1.860703.
@article{osti_6483672,
title = {Homogeneous dynamos: Theory and practice},
author = {Roberts, P.H. and Jensen, T.H.},
abstractNote = {The magnetism of many naturally occurring bodies is attributed to the motion of conducting fluids in their interiors. Although the physical principles underlying such self-excited dynamos are identical to those governing an electric generator in a power station, they (unlike the commercial machine) operate in a simple homogeneous body of conductor, and are therefore less easily excited. The theory of such homogeneous dynamos'' is adumbrated here, and past attempts to construct working laboratory models are reviewed. Consideration is given to the possibility of conducting a turbulent homogeneous dynamo experiment in liquid sodium. The proposed configuration is a crude representation of the simplest of all theoretical dynamo models, that of Ponomarenko [J. Appl. Mech. Tech. Phys. [bold 14], 755 (1972)]. In addition to demonstrating for the first time a homogeneous magnetohydrodynamic (MHD) dynamo in the laboratory, the experiment should enhance understanding of MHD turbulence, and provide insight into how the field generation process saturates.},
doi = {10.1063/1.860703},
journal = {Physics of Fluids B; (United States)},
issn = {0899-8221},
number = ,
volume = 5:7,
place = {United States},
year = {1993},
month = {7}
}