Type of Document	Dissertation
Author	Liang, Changnian
URN	etd-11102005-141104
Title	A new surface resistance measurement method with ultrahigh sensitivity
Degree	PhD
Department	Physics
Advisory Committee	Advisor Name Title No Advisors Found
Keywords	Superconductors Mathematical models Calorimetry Superconductivity
Date of Defense	1993-05-05
Availability	restricted
Abstract A superconducting niobium triaxial cavity has been designed and fabricated to study residual surface resistance of planar superconducting materials. Unlike many other structures where the test samples are placed in strong magnetic field positions, the edge of a 25.4 mm or larger diameter sample in the triaxial cavity is located outside the strong field region. Therefore, the edge effects and possible losses between the thin film and the substrate have been minimized in this design, ensuring that the induced RF losses are intrinsic to the test material. The fundamental resonant frequency of the cavity is 1.5 GHz, the same as the working frequency of CEBAF cavities. The cavity has a compact size compared to its TE011 counterpart, which makes it more sensitive to the sample's loss.
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