SUPERCONDUCTIVE FREQUENCY CONTROL DEVICES.

Abstract

Surface impedance theories and experimental results are examined. The quantum mechanical approach gives curves having the right general shape with temperature and frequency. They are inferior to the phenomenological approach in accuracy, however. The quantum approach is most useful at high frequencies. The most attractive theory seems to be the one developed by Dresselhaus and Dresselhaus. Theoretical equations and experimental data are presented for comparison. DC superconductive properties of Lead-Tin alloy foils are presented. Critical temperature remains near 7.2 K until lead concentration falls below 20%. In a magnetic field the alloys have type II behavior with higher critical field and broader resistive transitions. Impurities in 100% Lead are very critical in determining resistivity since this metal tends to be selfannealing. Circuit configurations discussed include helical resonators, foil wound on quartz, and thin films. Electroplating lead is described. (Author)

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1963
Accession Number
AD0433473

Entities

People

  • William H. Hartwig

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Accuracy
  • Alloys
  • Critical Temperature
  • Deposition (Materials Processing)
  • Electroplating
  • Equations
  • Experimental Data
  • Films
  • Frequency
  • Impedance
  • Impurities
  • Magnetic Fields
  • Metals
  • Resonators
  • Thin Films
  • Tin Alloys

Fields of Study

  • Physics

Readers

  • Superconducting Magnet Technology
  • Surface Engineering/Surface Coating Technology.
  • Theoretical Analysis.

Technology Areas

  • Quantum Computing