Comparison of different configurations of NbTi magnetic lenses

Z. Y. Zhang, S. Matsumoto, S. Choi, R. Teranishi, T. Kiyoshi

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)


    Magnetic lenses are new devices that concentrate magnetic flux by using the diamagnetism of superconductors. Magnetic lenses of two types made from NbTi sheets were constructed; measurements were made on them and they were systematically studied. TypeA was constructed by stacking NbTi rings that had identical outer diameters and increasing inner diameters to form a hollow cone. Each ring had a slit to suppress the circumference current. Three construction methods for typeA were tested: the rings were stacked with their slits aligned but with no insulation between the rings (A-1), with their slits aligned and with insulation between the rings (A-2), and with their slits in different positions and with insulation between the rings (A-3). For typeB, sheets were rolled into hollow cones. Three identical cones were stacked to form a lens (B-1) and a single cone was used as a reference lens (B-2). The lenses were assembled in a cryocooler-cooled cryostat with a NbTi magnet. The quenching behavior, concentration ratio, hysteresis, and decay behavior were measured. Because of its larger dimensions, typeB had a larger 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 about 0.64T. The results suggest that quenching was caused by the NbTi sheet itself.

    Original languageEnglish
    Article number105012
    JournalSuperconductor Science and Technology
    Issue number10
    Publication statusPublished - 2011

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites
    • Condensed Matter Physics
    • Metals and Alloys
    • Electrical and Electronic Engineering
    • Materials Chemistry


    Dive into the research topics of 'Comparison of different configurations of NbTi magnetic lenses'. Together they form a unique fingerprint.

    Cite this