Speaker
Dr
Emanuela Barzi
(Fermi National Accelerator Laboratory)
Description
It is well known that superconducting (SC) materials repel magnetic field, whereas paramagnetic ones concentrate flux lines in their interior. By using concentric tubes of the two materials, the magnetic field inside a cylinder is canceled without modifying the external applied field. Analytical solutions exist, which provide a relation between the thickness of the paramagnetic material and the relative permeability necessary for a complete cloaking. In this paper we perform a feasibility study on whether this concept works to shield large magnetic fields, by using bulk MgB2 superconductor prepared by the Reactive Liquid Infiltration (RLI) in-situ process. With conventional ovens, it is possible to produce large superconducting bulk pieces using this patented technology. A number of paramagnetic materials have been searched for, and their magnetic permeability measured. Tube junctions have been studied, as well as effects of tube ends, geometry and flux jumps. A successful hybrid cloak would find immediate application at FNAL in the Muon g-2 experiment, which presently relies on a SC inflector magnet to cancel the 1.5 Tesla storage ring field seen by the muon beam at injection.
Primary author
Dr
Giovanni Giunchi
(self-employed)
Co-author
Dr
Emanuela Barzi
(Fermi National Accelerator Laboratory)
