By Topic

Superconducting Joint and Persistent Current Switch for a 7-T Animal MRI Magnet

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

4 Author(s)
Siyuan Liu ; Dept. of Electr. Eng., Tsinghua Univ., Beijing, China ; Xiaohua Jiang ; Guolin Chai ; Jiangbo Chen

The fabrication and test of the multifilament NbTi superconducting joints and NbTi/CuNi persistent current switch for a 7-T animal magnetic resonance imaging magnet are presented. The joints were fabricated by the solder matrix replacement method in the open air environment, and the samples were tested by a measuring facility that was developed based on the current-decay method and can supply a background magnetic field up to 0.6 T. The measured results indicate that the NbTi/Cu sample joints can carry a current up to 1000 A with a resistance lower than 3 ×10-14 Ω, while the NbTi/CuNi sample joint can carry a current up to 630 A with a resistance lower than 4 ×10-14 Ω under a magnetic field of 0.6 T. The thermally triggered switch was designed based on a two-dimensional axisymmetric finite-element analysis thermal model that is built with the commercial code ANSYS. It has an off-state resistance of 5 Ω and an equal switch-off to recovery time of about 2.5 s at a heating current of 120 mA.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:23 ,  Issue: 3 )