Accession Number:

AD0276959

Title:

INVESTIGATION OF APPLICATIONS OF SUPERCONDUCTIVITY

Descriptive Note:

Corporate Author:

TEXAS INSTRUMENTS INC DALLAS

Personal Author(s):

Report Date:

1962-04-13

Pagination or Media Count:

1.0

Abstract:

Flux pump noise from several sources was reduced to where it represents only 33 quanta of flux. This corresponds to a magnetic field of about 10 to the -6th power oersted or to a sensitivity of 3.9 x 10 to the -10th power ampere when measurements are made using the pickup coil of the galvanometer as the input to the flux pump. The pump was used as a microvoltmeter to measure the EMF generated by a thermocouple. Experiments with magnetic shielding produced no shielding better than a Mu metal shield outside the dewar combined with a Pb superconducting can around the pump. The principal application of the flux pump appears to be in cryogenic research. A magnetic communication system using the pump as a detector seems impractical. Pumping methods using no moving parts were developed to produce large circulating currents in the dewar with only small current inputs. Current gains as high as 40 to 1 were achieved, and larger gains are possible. If superconducting materials are developed that will carry the required currents, this method could be invaluable for generating large magnetic fields. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE