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    Forces on a superconducting disc rotating in a magnetic field

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    Author
    Hardy, Rodger Willard
    Date
    1967
    Advisor
    Houston, William V.
    Degree
    Master of Arts
    Abstract
    This thesis describes experiments performed on a system consisting of a superconducting tin disc suspended to oscillate about its axis as a torsion pendulum. This disc is made to oscillate in a uniform magnetic field directed normal to its surface. Some nonuniformity is introduced in the field by having the disc oscillate above and parallel to a superconducting tin plate of the same diameter as the disc. Regularly spaced holes drilled in the plate trapped flux which also penetrated the pendulum, producing intermediate-state regions. The resulting motion was damped harmonic motion with the damping torque proportional to the angular velocity. This was indicated by graphs of the logarithm of the amplitude against time giving straight lines. This was true for nonuniform fields produced by plates having many holes, few holes, or no holes. The conclusion was that the damping torque is proportional to the angular velocity regardless of how the nonuniformity in the field is produced. Damping in the normal state in a uniform field without any plate was explained as being due to a small horizontal component of the magnetic field which was due partly to the coils and partly to the earth's field.
    Citation
    Hardy, Rodger Willard. "Forces on a superconducting disc rotating in a magnetic field." (1967) Master’s Thesis, Rice University. https://hdl.handle.net/1911/89853.
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    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map