Superconducting Wire Filament Twist Angle Optimization
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Solution Overview
Problem
Superconducting wires, particularly those made of Nb3Sn, exhibit a significant dependence of critical current on axial expansion at high magnetic fields due to lattice distortion, leading to inefficiencies in magnet construction and increased costs.
Innovation Solution
The superconducting filaments are twisted to an angle of approximately 58° relative to the wire axis, minimizing lattice distortion and maintaining a maximum critical current regardless of external axial strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If superconducting filaments are twisted to reduce coupling currents, then stability against magnetic field changes is improved, but the critical current becomes highly sensitive to axial strain
Solution Approach 1:
The patent applies parameter changes by optimizing the twist length to a specific value (15mm) that simultaneously reduces coupling currents and minimizes axial strain sensitivity. This involves changing the geometric parameter (twist length) to achieve a balance between two conflicting requirements: stability against magnetic field changes and reliability of critical current under axial strain.
2Reliability
If wire length is increased to accommodate strain-dependent critical current, then magnetic field performance is maintained, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent uses parameter changes by optimizing the twist length to maximize critical current while minimizing axial strain sensitivity. This allows the use of shorter wire lengths to achieve the same magnetic field performance, thereby reducing manufacturing costs and device complexity without compromising reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the dependence of the critical current on axial expansion, allowing for more efficient use of superconducting wire, reducing required lengths and costs, and enabling more compact magnet designs with reduced electromagnetic forces.
Implementation Method 1
the distortion of the crystallographic lattice of the current-carrying filaments becomes independent of an external axial strain
Implementation Method 2
The critical current has a maximum value for a purely cubic Nb3Sn lattice, i.e. without distortion
Data Source
AI summary
A method for producing a superconducting wire with a plurality of filaments, at least some of which are twisted around the wire axis, is characterized in that the superconducting filaments are twisted such that the majority of the filaments are at a twist angle greater than 50° with respect to the wire axis. This makes it possible, using simple technical means, to significantly reduce the strong dependence of the critical current of a superconducting wire at high magnetic fields as a function of axial strain. Furthermore, the invention enables the dependence of the critical current of a superconducting wire at high magnetic fields as a function of axial strain to be largely eliminated with a corresponding arrangement of the superconducting filaments.