Title :
A superconducting hydrogen maser resonator made from electrophoretic YBa2Cu3O7-δ
Author :
Opie, D. ; Schone, H. ; Hein, M. ; Müller, G. ; Piel, H. ; Wehler, D. ; Folen, V. ; Wolf, S.
Author_Institution :
Dept. of Phys., Coll. of William & Mary, Williamsburg, VA, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
The construction and test of three loop-gap resonators which are being prepared for the high-temperature superconductor space experiment (HTSSE) are discussed. The loop-gap electrodes are the lossiest parts of such a resonator. In a first step these electrodes, with a surface of 150 cm2, were covered with YBCO. The Q values of the resonators at 77 K ranged between 2.3×104 and 3.1×104 and exceed the minimum requirement for a later maser application. They correspond to a surface resistance between 0.7 and 1.4 mΩ, which is a factor of three to five below the equivalent value of copper. The cavities can be excited in a higher-order mode (HOM) at 4.3 GHz with a field distribution that is still sensitive to the superconducting electrodes. Thus, the experimental requirements for the HTSSE project can be fulfilled
Keywords :
Q-factor; barium compounds; cavity resonators; electrophoretic coatings; high-temperature superconductors; hydrogen; masers; superconducting devices; superconducting thin films; yttrium compounds; 0.7 to 1.4 mohm; 4.3 GHz; 77 K; H maser; HTSSE project; Q values; SHF; electrophoretic YBa2Cu3O7-δ; high-temperature superconductor; higher-order mode; loop-gap resonators; space experiment; superconducting electrodes; superconducting resonator; surface resistance; Electrodes; High temperature superconductors; Hydrogen; Laboratories; Masers; Physics; Superconducting microwave devices; Surface resistance; Testing; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
