SUPERCONDUCTIVE FREQUENCY CONTROL DEVICES
Quarterly rept. no. 3, 1 Jan-31 Mar 1963
TEXAS UNIV AT AUSTIN ELECTRONIC MATERIALS RESEARCH LAB
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An active experimental program began at 21 mc. with tunable circuits capable of being operated immersed or evacuated. Extensive tests were commercial 40Sn-60Pb alloy circuits to calibrate the experiment. An identical circuit coated with pure tin having a 5Sn-95Pb shield can was tested for the effects of temperature and magnetic field upon Q and resonant frequency. Residual resistance was higher than expected. A tuning slug resulted in a three fold drop in Q when fully extended. Construction of an rf amplifier continued which will be in operation at an early date. Several thin-film circuits have been successfully deposited. In parallel a technique for building foil circuits of tin, lead, tin-lead alloys, niobium, tantalum and vanadium has been developed. The alloy foils are rolled in the laboratory after mixing high purity lead and tin in proper proportions and melting. Theoretical studies continued on the transfer function of an oscillator incorporating one or two coupling probes at the tank. Calculation of inductance is nearing completion. Comparison between experimental residual resistance measurements and theory are discussed.
- Electrical and Electronic Equipment