DocumentCode :
983424
Title :
Filament-size dependent critical current of multifilamentary Nb3 Sn conductors
Author :
Rupp, G. ; Wohlleben, K. ; Springer, E.
Author_Institution :
Siemens AG, Erlagen, FRG
Volume :
17
Issue :
5
fYear :
1981
fDate :
9/1/1981 12:00:00 AM
Firstpage :
1622
Lastpage :
1624
Abstract :
The critical current density 
of multifilamentary Nb3 Sn conductors depends on the diameter of the filaments. At low fields (less than about 12 T) increases with decreasing filament diameter because of the finer grain size. At high fields increases with increasing filament diameter. Measurements of the critical current under externally applied tensile stress revealed that changes of the internal compression of the Nb3 Sn within the composite account for this effect. The larger the filament diameter, the smaller the compressive strain, the higher the upper critical field and therefore at high fields. The decrease of compressive strain with increasing filament size results from a decrease in the yield stress of the bronze which is caused by an increase in grain size of the bronze between the filaments.
of multifilamentary Nb increases with decreasing filament diameter because of the finer grain size. At high fields increases with increasing filament diameter. Measurements of the critical current under externally applied tensile stress revealed that changes of the internal compression of the Nb at high fields. The decrease of compressive strain with increasing filament size results from a decrease in the yield stress of the bronze which is caused by an increase in grain size of the bronze between the filaments.Keywords :
Superconducting materials; Capacitive sensors; Conductors; Critical current; Critical current density; Current measurement; Grain size; Niobium; Stress measurement; Tensile stress; Tin;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1981.1061403
Filename :
1061403
Link To Document :
