By Topic

The Measured Time and Frequency Response of a Miniature Superconducting Coaxial Line

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Ekstrom, M.P. ; Lawrence Radiation Laboratory, University of California Livermore, California and Department of Electrical Engineering University of California, Davis ; McCaa, W.D. ; Nahman, N.S.

A miniature superconducting 52 ohm coaxial transmission line 278 meters long, having a lead outer conductor (0.129 cm id), a teflon dielectric, and a niobium center conductor (0.038 cm), has been measured in both the time and frequency domains. The observed system step response (10% - 90%) times were 1.5 ¿s at room temperature, 375 ns at 77K, and 255 ps at 4. 2K. The system step response data for 4.2K was processed by a numerical system identification routine to determine the step response of the miniature superconducting line; the processed data gave a 220 ps risetime. Although the observed step responses at 4.2K were smooth transitions, the observed swept frequency (0.1 GHz - 12 GHz) attenuation at 4. 2K was a quasi-periodic function of frequency, which indicated that the nonuniformity of the superconducting line was significant. For example, near 5 GHz and at 4.2K, the attenuation minimum was 1.1 dB while about 0.5 MHz away the attenuation was 5 dB. By making normal conductivity measurements of the Nb conductor and incorporating the results into the two fluid model, the uniform line attenuation for 5 and 10 GHz was calculated with the classical and anomalous limits. The lowest observed attenuation values in the vicinity of 5 and 10 GHz fell between the computed classical and anomalous limit attenuation values.

Published in:

Nuclear Science, IEEE Transactions on  (Volume:18 ,  Issue: 5 )