Superconducting magnetic coil
AssigneeAmerican Superconductor Corporation
InventorsDawood Aized, Robert E. Schwall
Life of this patent
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Abstract
A superconducting magnetic coil includes a plurality of sections positioned axially along the longitudinal axis of the coil, each section being formed of an anisotropic high temperature superconductor material wound about a longitudinal axis of the coil and having an associated critical current value that is dependent on the orientation of the magnetic field of the coil. The cross section of the superconductor, or the type of superconductor material, at sections along the axial and radial axes of the coil are changed to provide an increased critical current at those regions where the magnetic field is oriented more perpendicularly to the conductor plane, to thereby increase the critical current at these regions and to maintain an overall higher critical current of the coil.
Claims23
A magnetic coil comprising sections positioned axially along a longitudinal axis of the magnetic coil, each section including a pancake coil comprising a high temperature superconductor wound about the longitudinal axis of the magnetic coil, each section having regions with critical current values, measured at a zero magnetic field, increasing in value from a central portion of the magnetic coil to end portions of the magnetic coil, the critical current value of each region being dependent on the angular orientation of a magnetic field of the magnetic coil.
A magnetic coil comprising sections positioned axially along a longitudinal axis of the coil, each section including a high temperature superconductor wound about the longitudinal axis of the coil and formed as a superconductor tape comprising a multi-filament composite superconductor including individual superconducting filaments which extend the length of the multi-filament composite conductor and are surrounded by a matrix-forming material, each section having regions with critical current values, measured at a zero magnetic field, increasing in value from a central portion of the coil to end portions of the coil wherein the cross-sectional area of the superconductor for each section decreases from regions proximate to the inner radial portion of the coil to the outer radial portion of the coil and the critical current values of the regions are varied by varying the cross-sectional area of the superconductor of the regions of each section.
A magnetic coil comprising sections positioned axially along a longitudinal axis of the coil, each section including a high temperature superconductor wound about the longitudinal axis of the coil, each section having a critical current value, the critical current values being substantially equal when a preselected operating current is provided through the superconducting coil.
A magnetic coil comprising sections positioned axially along a longitudinal axis of the coil, each section including a high temperature bulk superconductor material wound about the longitudinal axis of the coil, each section having regions with critical current values, measured at a zero magnetic field, increasing in value from a central portion of the coil to end portions of the coil, and wherein the critical current values of the regions of the sections decrease in value from an inner radial portion of the coil, proximate to the longitudinal axis of the coil, to an outer radial portion of the coil.
Dependencies are inferred from the claim text.