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Comparison of different configurations of NbTi magnetic lenses

Identifieur interne : 000B27 ( Main/Exploration ); précédent : 000B26; suivant : 000B28

Comparison of different configurations of NbTi magnetic lenses

Auteurs : Z Y Zhang [Japon] ; S. Matsumoto [Japon] ; S. Choi [Corée du Sud] ; R. Teranishi [Japon] ; T. Kiyoshi [Japon]

Source :

RBID : ISTEX:1272CE4EDE03E70D7F3B0557844EDD952033A233

Abstract

Magnetic lenses are new devices that concentrate magnetic flux by using the diamagnetismof superconductors. Magnetic lenses of two types made from NbTi sheets wereconstructed; measurements were made on them and they were systematicallystudied. TypeA was constructed by stacking NbTi rings that had identical outerdiameters and increasing inner diameters to form a hollow cone. Each ring had a slitto suppress the circumference current. Three construction methods for typeAwere tested: the rings were stacked with their slits aligned but with no insulationbetween the rings (A-1), with their slits aligned and with insulation betweenthe rings (A-2), and with their slits in different positions and with insulationbetween the rings (A-3). For typeB, sheets were rolled into hollow cones. Threeidentical cones were stacked to form a lens (B-1) and a single cone was used as areference lens (B-2). The lenses were assembled in a cryocooler-cooled cryostat witha NbTi magnet. The quenching behavior, concentration ratio, hysteresis, anddecay behavior were measured. Because of its larger dimensions, typeB had alarger concentration ratio (2.49 for B-1) than typeA (1.87 for A-1). Both lenses(typesA and B-1) were quenched when the concentrated flux density reached about0.64T. The results suggest that quenching was caused by the NbTi sheet itself.


Url:
DOI: 10.1088/0953-2048/24/10/105012


Affiliations:


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<div type="abstract">Magnetic lenses are new devices that concentrate magnetic flux by using the diamagnetismof superconductors. Magnetic lenses of two types made from NbTi sheets wereconstructed; measurements were made on them and they were systematicallystudied. TypeA was constructed by stacking NbTi rings that had identical outerdiameters and increasing inner diameters to form a hollow cone. Each ring had a slitto suppress the circumference current. Three construction methods for typeAwere tested: the rings were stacked with their slits aligned but with no insulationbetween the rings (A-1), with their slits aligned and with insulation betweenthe rings (A-2), and with their slits in different positions and with insulationbetween the rings (A-3). For typeB, sheets were rolled into hollow cones. Threeidentical cones were stacked to form a lens (B-1) and a single cone was used as areference lens (B-2). The lenses were assembled in a cryocooler-cooled cryostat witha NbTi magnet. The quenching behavior, concentration ratio, hysteresis, anddecay behavior were measured. Because of its larger dimensions, typeB had alarger concentration ratio (2.49 for B-1) than typeA (1.87 for A-1). Both lenses(typesA and B-1) were quenched when the concentrated flux density reached about0.64T. The results suggest that quenching was caused by the NbTi sheet itself.</div>
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