Accession Number:

AD0294128

Title:

SUPERCONDUCTIVE FREQUENCY CONTROL DEVICES

Descriptive Note:

Corporate Author:

TEXAS UNIV AT AUSTIN ELECTRONIC MATERIALS RESEARCH LAB

Personal Author(s):

Report Date:

1962-09-30

Pagination or Media Count:

1.0

Abstract:

Research was continued on the performance of superconductive tank circuits and on design criteria for a tunable superconductive frequency control device. Measurements were made of 75 lead-25 tin and pure lead circuit, including frequencies of 36, 93, and 171 mc. Pure lead residual resistance was nearly an order of magnitude lower than for the alloy. The frequency dependence was consistent with theory. Measurements of change in residual resistance with an external dc magnetic field agreed with the theory of Dresselhaus and Dresselhaus. Estimate of effective mass for electrons in this alloy and in pure lead were made which are consistent with published values derived from heat capacity measurements. Analysis of the effects of coupling upon frequency and Q are verified by measurement. After correcting the experimental curves for temperature-independent losses, residual resistance limited Qs at 36 mc exceed 1.3 x 10 to the 7th power for the alloy. Theoretical studies of calculation in inductance continued. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE