Materials Development and Characterization for Trapped Field Magnets
Abstract
Pinning centers have been studied in the high temperature superconductor (HTS) YBa2Cu3O(7-delta), using damage centers created by neutrons, protons, high Z ions, and Uranium fission. The aim of this study was to increase the critical current, J sub c, decrease the creep, and decrease the anisotropy while reducing cost and residual radioactivity. Such material could immediately be applied to make superior trapped field magnets, and may be applied to many other devices. Results are that J sub c = J sub c(T, BA) has been increased by factors of 10 to 42, depending on the operating values of temperature, T, and applied field. The resultant material also has the lowest cost, by a factor of 5-100, and has also the lowest radioactivity, by a factor of 5. The increases in J sub c are maintained at high field (e.g., 14 Tesla). The effects on creep and T sub c are small. In other work a method was developed to, practically, eliminate creep by use of post activation cooling. In addition, the theory of cracking under magnetic pressure has been corrected, and experimentally confirmed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 31, 1998
- Accession Number
- ADA344454
Entities
People
- Roy Weinstein
Organizations
- University of Houston