By Topic

Transport properties of long-lengths of RHQT processed Nb3Al conductor

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

13 Author(s)
Takeuchi, T. ; Supercond. Mater. Center, Nat. Inst. for Mater. Sci., Tsukuba, Japan ; Tagawa, K. ; Fukuzaki, T. ; Banno, N.
more authors

A rapid heating and quenching (RHQ) operation along a long-length of jellyroll Nb/Al precursor over 300 m has been established. The Jc varies sensitively with the joule-heating current (IRHQ) that determines the temperature from which a precursor wire is quenched, excluding the "plateau" region where the bcc supersaturated-solid solution (Nb(Al)ss) only forms. The RHQ operation using such a plateau condition can suppress a scatter of Jc from point to tail of a long-length of wire. The standard deviation of Jc (4.2 K) at 21 T along a long-length of wire was about 5%, which was less than the variation of Jc with IRHQ in the plateau region (±7%). The mechanical deformation process needed when incorporating the Cu stabilizer also plays an important role in ensuring uniform heat treatment of the coil that is wound with a long-length of wire and, hence, large heat capacity. Although a temperature ramp-up rate might differ from place to place in the coil, the deformation processing makes such a ramp-up rate insensitive to these critical parameters. The coils using 300.5 m and 254 m lengths of Cu-clad RHQT JR Nb3Al conductor generated additional 2.3 T and 3.2 T in bores of 90.2 mmφ and 64.6 mmφ, respectively, indicating that a long-length of RHQT JR Nb3Al conductor can be trustworthy for practical coil applications.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:13 ,  Issue: 2 )