Design of coupled or uncoupled multifilamentary SSC-type strands with almost zero retained magnetization at fields near 0. 3 T

Conference · Sun Jan 01 04:00:00 EST 1989

DOI:https://doi.org/10.1007/978-1-4613-9880-6_32· OSTI ID:5215369

Collings, E W; Marken, Jr, K R; Sumption, M D

Multifilamentary Cu-matrix strands with interfilamentary spacing as small as 0.2 {mu}m 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 M{sub R}) of the winding material is responsible for unwanted distortion (multipole formation) of the dipolar field. It is demonstrated that M{sub R} 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 {minus}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. 9 refs., 2 figs., 4 tabs.

• Research Organization: Battelle Columbus Div., OH (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-86ER40296
• OSTI ID: 5215369
• Report Number(s): CONF-890701-26; ON: DE90005391
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
COMPOSITE MATERIALS
COPPER ALLOYS
COUPLING
FILAMENTS
INTERMETALLIC COMPOUNDS
MAGNETIC FIELDS
MAGNETIZATION
MANGANESE ADDITIONS
MANGANESE ALLOYS
MATERIALS
NIOBIUM ALLOYS
SUPERCONDUCTING COMPOSITES
TITANIUM ALLOYS