Extension to AC Loss Minimisation in High Temperature Superconductors
Abstract
This report results from a contract tasking University of Cambridge as follows: The contractor will investigate: 1) AC losses of appropriate Yttrium Barium Copper Oxide (YBCO) samples with strong potential for minimizing losses at high frequencies and magnetic fields with the existing equipment. Measurements will be made using copper split solenoid apparatus, which can produce 0.3 tesla (peak) at 50Hz. 2) The effect of filament width and grain size on losses. The loss should be inversely proportional to the width so fine filaments are required. However the inevitable presence of low angle grain boundaries means that if the width is less than that of a few grains there may not be a high current percolation path along the whole conductor. The best compromise between the two conflicting criteria will be determined. 3) Thermal stability of conductors. 4) Coupling losses at high frequencies and long conductor lengths. 5) Model conductor losses and stability in a complete winding. 5) Superconducting filaments isolated from the substrate will be investigated and techniques for reducing losses will be evaluated. 6) Transport losses in long length conductors will be measured using helical windings.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 31, 2005
- Accession Number
- ADA449788
Entities
People
- Archie M. Campbell
- B. A. Glowacki
- M. Majoros
Organizations
- University of Cambridge