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A lead-on-sapphire superconducting cavity of superior qualityA cavity consisting of a superconducting lead film on a sapphire substrate has been fabricated to obtain the enhanced frequency stability possible with this configuration. The cavity exhibits a quality value Q exceeding 2 x 10 to the 9th in its TE011 mode with a resonant frequency of 2.689 GHz. Methods of fabrication and testing of the cavity are presented. Since the interface between the film and substrate is exposed ot the full value of the resonant magnetic field, the present experiment is the most sensitive test to date for enhanced losses at the interface itself. No evidence of such losses is used. In fact, the measured values of the surface resistance match very well predictions for RF losses based on the BCS theory.
Document ID
19860038499
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Thakoor, S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Strayer, D. M.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Dick, G. J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Mercereau, J. E.
(California Institute of Technology Pasadena, United States)
Date Acquired
August 12, 2013
Publication Date
February 1, 1986
Publication Information
Publication: Journal of Applied Physics
Volume: 59
ISSN: 0021-8979
Subject Category
Electronics And Electrical Engineering
Accession Number
86A23237
Distribution Limits
Public
Copyright
Other

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