A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Design of Coupled or Uncoupled Multifilamentary SSC-Type Strands with Almost Zero Retained Magnetization at Fields Near 0.3 T
Abstract Multifilamentary Cu-matrix strands with interfilamentary spacing as small as 0.2 μm can be almost fully decoupled by the addition of 0.5 wt.% Mn to the interfilamentary Cu. Decoupling in this way seems to be beneficial from a field-stability standpoint. On the other hand, the elimination of coupling does little to reduce residual strand-magnetization at the injection field of about 0.3 T when that field is approached, as usual, along the shielding branch of M(H). This residual diamagnetic magnetization (say MR) of the winding material is responsible for unwanted distortion (multipole formation) of the dipolar field. It is demonstrated that MR can be locally cancelled to zero by associating the strand with a small volume-fraction (less than 2%, depending on filament diameter) of pure Ni or any other low-field-saturable ferromagnetic material. The presence of the Ni has little effect on the shape of the M(H) hysteresis loop of the strand, other than to shift its wings uniformly in the + M (when H is positive) and -M directions, respectively. In practice, the Ni could be administered as: (a) additional filaments, (b) interfilamentary barriers, or (c) an electroplated layer on the outside of the strand.
Design of Coupled or Uncoupled Multifilamentary SSC-Type Strands with Almost Zero Retained Magnetization at Fields Near 0.3 T
Abstract Multifilamentary Cu-matrix strands with interfilamentary spacing as small as 0.2 μm can be almost fully decoupled by the addition of 0.5 wt.% Mn to the interfilamentary Cu. Decoupling in this way seems to be beneficial from a field-stability standpoint. On the other hand, the elimination of coupling does little to reduce residual strand-magnetization at the injection field of about 0.3 T when that field is approached, as usual, along the shielding branch of M(H). This residual diamagnetic magnetization (say MR) of the winding material is responsible for unwanted distortion (multipole formation) of the dipolar field. It is demonstrated that MR can be locally cancelled to zero by associating the strand with a small volume-fraction (less than 2%, depending on filament diameter) of pure Ni or any other low-field-saturable ferromagnetic material. The presence of the Ni has little effect on the shape of the M(H) hysteresis loop of the strand, other than to shift its wings uniformly in the + M (when H is positive) and -M directions, respectively. In practice, the Ni could be administered as: (a) additional filaments, (b) interfilamentary barriers, or (c) an electroplated layer on the outside of the strand.
Design of Coupled or Uncoupled Multifilamentary SSC-Type Strands with Almost Zero Retained Magnetization at Fields Near 0.3 T
Collings, E. W. (author) / Marken, K. R. Jr. (author) / Sumption, M. D. (author)
1990-01-01
8 pages
Article/Chapter (Book)
Electronic Resource
English
AC Loss Measurements of Two Multifilamentary NbTi Composite Strands
| Springer Verlag | 1990
Uncoupled/coupled buckling response of piezothermoelastic composite plates
| British Library Online Contents | 2017
Coupled geomechanics-fluid flow modeling in petroleum reservoirs: Coupled versus uncoupled response
| British Library Conference Proceedings | 2000
Coupled and uncoupled contaminant transport using advanced finite volume methods
| British Library Online Contents | 2006