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Magnetic compensation of gravity forces in liquid/gas mixtures: surpassing intrinsic limitations of a superconducting magnetby using ferromagnetic inserts

Published online by Cambridge University Press:  26 October 2005

L. Quettier ,
H. Félice ,
A. Mailfert ,
D. Chatain  and
D. Beysens
L. Quettier*
Affiliation:
GREEN, INPL-Nancy, 2 Av. de la Forêt de Haye, 54516 Vandœuvre, France SACM, CEA-Saclay, 91191 Gif-sur-Yvette, France
H. Félice
Affiliation:
GREEN, INPL-Nancy, 2 Av. de la Forêt de Haye, 54516 Vandœuvre, France SACM, CEA-Saclay, 91191 Gif-sur-Yvette, France
A. Mailfert
Affiliation:
LEM, INPL-Nancy, 2 Av. de la Forêt de Haye, 54516 Vandœuvre, France
D. Chatain
Affiliation:
SBT, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex, France
D. Beysens
Affiliation:
SBT, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex, France
*
[email protected]
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Abstract

Magnetic compensation of gravity forces, similar to the space conditions of “microgravity”, needs the production of a uniform magnetic force field. We derive here a basic mathematical result that shows the impossibility to establish exact gravity compensation in a finite volume. The imperfection of compensation can be, however, quantified and a relation is derived between homogeneity accuracy and compensation volume in a cylindrical symmetry. We study how the use of inserts made of saturated ferromagnetic materials can modify the homogeneity of magnetic force field. In order to illustrate this result, an iron insert has been numerically calculated for the particular case of gravity compensation of H2 in a 10 T superconducting coil. An experimental test has been carried out on a H2 vapour bubble very close to its gas-liquid critical point. Near the critical point the gas-liquid interfacial tension is vanishing, then any bubble deformation from the ideal spherical shape reveals the non-homogeneities in the magnetic compensation force.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 32 , Issue 3 , December 2005 , pp. 167 - 175
Copyright
© EDP Sciences, 2005

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