Multifilamentary Nb/sub 3/Sn dipole magnet
A one meter long, 8 cm aperture dipole magnet was constructed from prereacted Nb/sub 3/Sn multifilamentary conductor. The conductor is in the form of a wide braid formed from 95 wires of 0.3 mm dia each containing 1045 filaments of niobium in a copper-tin matrix. After braiding and compacting, the conductor was heat treated to form the Nb/sub 3/Sn filaments. The braid was then wound into a dipole of the ISA type using techniques similar to those employed in the construction of magnets from the more conventional NbTi braid. Voltage taps were attached to the conductor at appropriate positions so that the effect of mechanical stress could be observed at the bends of greatest curvature. The effective resistivity of the bent regions of the conductor showed a marked dependence on the bend radius varying from 7 x 10/sup -10/ ohm-cm at a radius of 0.6 cm to approximately 10/sup -10/ ohm-cm at 1.0 cm measured at a field of 3 T and a current density of 3.7 x 10/sup 4/ Amps/cm/sup 2/. While the bending of the conductor during coil fabrication did lead to some damage of the Nb/sub 3/Sn filaments, it was not the factor limiting coil performance. The connection between the coil halves in the magnet was resistive and limited the maximum coil current to 2650 amps, well below the short sample limit. An improved method of coil interconnection is being used in future magnets in this series and should make it possible to extend the measurements to higher fields and current densities.
- Research Organization:
- Brookhaven National Lab., Upton, N.Y. (USA)
- DOE Contract Number:
- E(30-1)-16
- OSTI ID:
- 7251383
- Report Number(s):
- BNL-21707; CONF-760839-7; TRN: 77-000365
- Resource Relation:
- Conference: Applied superconductivity conference, Palo Alto, CA, USA, 17 Aug 1976
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ISABELLE STORAGE RINGS
SUPERCONDUCTING MAGNETS
CONSTRUCTION
DIPOLES
FILAMENTS
HEAT TREATMENTS
INTERMETALLIC COMPOUNDS
NIOBIUM BASE ALLOYS
SUPERCONDUCTING WIRES
TESTING
TIN ALLOYS
ALLOYS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
MAGNETS
MULTIPOLES
NIOBIUM ALLOYS
STORAGE RINGS
SUPERCONDUCTING DEVICES
WIRES
430400* - Particle Accelerators- Storage Rings
420201 - Engineering- Cryogenic Equipment & Devices