Title :
HTS microwave cavity with temperature-independent frequencies
Author :
Mueller, F.M. ; Reagor, D. ; Maggiore, C.J. ; McMurry, D. ; Cooke, D.W. ; Plyum, T.C. ; Muenchaussen, R.E. ; Arendt, P.N. ; Daugherty, M.A. ; Roberts, B.F. ; Cass, R.B. ; Loh, R.
Author_Institution :
Los Alamos Nat. Lab., NM, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
An HTS-walled and sapphire-loaded class of microwave cavities is described whose low TE modes show a frequency maximum at a controllable temperature. This makes the resonant frequencies of such passively compensated cavities independent or invariant of temperature at this point. Two different experimental realizations are presented. For a 7.8 GHz TE 011 mode, one cavity exhibited a frequency shift of less than 12 kHz over a 25 degree range, centered at 115 Kelvin.<>
Keywords :
Q-factor; barium compounds; calcium compounds; high-temperature superconductors; superconducting cavity resonators; superconducting device testing; superconducting thin films; surface conductivity; thallium compounds; 115 K; 7.8 GHz; Al/sub 2/O/sub 3/; HTS-walled microwave cavities; TE 011 mode; Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub 8/; controllable temperature; frequency maximum; frequency shift; high temperature superconductors; low TE modes; passively compensated cavities; sapphire-loaded microwave cavities; superconducting thin film; surface resistance; temperature-independent frequencies; Cooling; Copper; High temperature superconductors; Resonant frequency; Stability; Superconducting films; Superconducting microwave devices; Tellurium; Temperature control; Thermal expansion;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
