DocumentCode :
1438379
Title :
Measurement of thermal contraction properties for NbTi and Nb/sub 3/Sn composites
Author :
Swenson, C.A. ; Dixon, I.R. ; Markiewicz, W.D.
Author_Institution :
Nat. High Magnetic Field Lab., Tallahassee, FL, USA
Volume :
7
Issue :
2
fYear :
1997
fDate :
6/1/1997 12:00:00 AM
Firstpage :
408
Lastpage :
411
Abstract :
Accurate knowledge of winding composite thermal contraction properties is critical to the design of large epoxy impregnated Nb/sub 3/Sn and NbTi coils. Measurement of thermal contraction properties allows the reliable design prediction of cold coil dimensions, the state of the coil form interface, resulting mechanical stresses from cool-down, and the correct locations of coils in an assembly. NbTi and Nb/sub 3/Sn epoxy glass winding composites have been built to precisely model the material, packing factors, and processing steps consistent with coil fabrication. Thermal contraction properties are measured using a strain gage measurement technique where gage signals are compared to known reference samples. Composites are inherently anisotropic. Gages are placed on each sample to measure the thermal contraction along each principal axis of the composite. This paper reports these measurement results.
Keywords :
composite superconductors; filled polymers; niobium alloys; superconducting coils; superconducting magnets; thermal expansion measurement; tin alloys; titanium alloys; windings; Nb/sub 3/Sn; NbTi; coil fabrication; coil form interface; cold coil dimensions; epoxy impregnated coils; mechanical stresses; packing factors; processing steps; strain gage measurement technique; thermal contraction properties; winding composites; Assembly; Coils; Mechanical factors; Mechanical variables measurement; Niobium compounds; Strain measurement; Stress measurement; Thermal stresses; Tin; Titanium compounds;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/77.614516
Filename :
614516
Link To Document :
بازگشت