skip to main content

Title: Screening magnetic fields by superconductors: A simple model

We introduce a simple approach to evaluate the magnetic field distribution around superconducting samples, based on the London equations; the elementary variable is the vector potential. This procedure has no adjustable parameters, only the sample geometry and the London length, λ, determine the solution. This approach was validated by comparing the induction field calculated to the one measured above MgB{sub 2} disks of different diameters, at 20 K and for applied fields lower than 0.4 T. The model can be applied if the flux line penetration inside the sample can be neglected when calculating the induction field distribution outside the superconductor. We conclude by showing on a cup-shape geometry how one can design a magnetic shield satisfying a specific constraint.
Authors:
 [1] ; ; ; ;  [2] ; ; ;  [3]
  1. Laboratoire de Mathématiques, INSA de Rouen, Avenue de l'Université, 76801 Saint-Etienne du Rouvray (France)
  2. Department of Applied Science and Technology, Politecnico di Torino, 10129, Torino (Italy)
  3. CRISMAT/LUSAC, Physics Department, Université de Caen (France)
Publication Date:
OSTI Identifier:
22266098
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 23; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPARATIVE EVALUATIONS; DESIGN; INDUCTION; LIMITING VALUES; LONDON EQUATION; MAGNESIUM BORIDES; MAGNETIC FIELDS; MAGNETIC SHIELDING; SHIELDS; SUPERCONDUCTORS