Segmented Superconducting Magnet Coil for High-Current Testing
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Solution Overview
Problem
The challenge in constructing compact and cost-effective superconducting NMR magnets lies in properly loading superconducting wires without exceeding current limits, as excessive current leads to magnetic field drift, and existing methods for testing new superconductors are either costly or impractical, especially when trying to maintain the same dimensions as standard conductors.
Innovation Solution
A method involving a magnet coil configuration subdivided into two partial regions, where the new superconductor is tested in one region with an additional switch, allowing for increased current load without overloading the standard superconductors, while maintaining the same dimensions and magnetic field stability, allowing for testing in a series-produced magnet without altering the coil construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the magnet current is increased to reduce the number of windings and make the magnet more compact, then the magnet size and cost are reduced, but the magnetic field drift becomes excessive
Solution Approach 1:
The magnet coil configuration is divided into two separate partial regions (first and second partial regions) that can be independently controlled. This segmentation allows different current loads to be applied to each region, enabling the tested superconductor in the first region to operate at higher current densities while the second region maintains standard operating conditions, thus resolving the contradiction between compact size and field stability.
Solution Approach 2:
Different current loading conditions are applied locally to different parts of the magnet system. The first partial region containing the tested superconductor receives increased current load to test its performance, while the second partial region maintains standard current levels to preserve overall magnetic field stability. This local differentiation allows simultaneous optimization of both magnet compactness and field stability.
2Stability of the object's composition
If the magnet current is set below the critical current to maintain field stability, then magnetic field drift is reduced, but the number of windings increases making the magnet larger and more expensive
Solution Approach 1:
By segmenting the magnet into two independently controllable partial regions, the system can apply different current levels to each region. The first region tests high-current superconductors that require fewer windings for compactness, while the second region operates at stable current levels, achieving both reduced size and maintained field stability.
Solution Approach 2:
The invention changes the operating parameters by allowing the first partial region to operate with excess current above the standard operating current I0, while the second partial region maintains standard current levels. This parameter differentiation enables the system to achieve compact dimensions through high-current testing in the first region while preserving field stability through standard operation in the second region.
3Ease of manufacture
If the new superconductor is tested in an existing series-produced magnet with the same conductor dimensions, then the magnet construction remains unchanged, but the new conductor cannot carry higher load than the standard conductor
Solution Approach 1:
The magnet is segmented into two partial regions, allowing the first region to be configured for testing higher current loads with the new superconductor while the second region maintains standard configuration. This segmentation enables the system to preserve ease of manufacture (standard construction in second region) while improving conductor load capacity testing (enhanced capability in first region).
Solution Approach 2:
Different conductor loading capabilities are implemented locally in different regions. The first partial region is optimized for testing high-current new superconductors, while the second partial region maintains standard conductor specifications. This local quality differentiation allows the system to maintain standard manufacturing processes while enabling testing of higher-load conductors.
4Reliability
If the conductor cross-section is reduced to increase current density, then higher current can be carried, but the coil body construction must be completely changed
Solution Approach 1:
The coil system is segmented into two partial regions with different conductor specifications. The first region can accommodate new conductor types with different cross-sections optimized for higher current density, while the second region maintains standard conductor dimensions and construction. This segmentation allows current carrying capacity to be improved in the first region without increasing overall device complexity, as the second region preserves the original simple construction.
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
Enables the testing of new superconductors under increased current loads with controlled magnetic field stability, allowing for the delivery and operation of the magnet without additional construction efforts, ensuring the new conductor meets or exceeds the performance of standard conductors, thus maintaining magnetic field stability and reducing costs.
Implementation Method 1
generates at an operating current I0 in its center and a homogeneous and temporally stable magnetic field B0 extending in a z direction
Implementation Method 2
at least the first partial region can be separately superconductingly short-circuited via an additional superconducting switch
Implementation Method 3
the first partial region contains the new superconducting wire to be tested instead of a standard wire
Data Source
AI summary
A method for testing a new superconducting wire involves charging an actively shielded magnet coil configuration which comprises a first partial region which can be superconductingly short-circuited using an additional switch. A superconductor to be tested under increased current load is used in this first partial region, thereby preventing superconductor in the second partial region from being subjected to this increased current load. Operating currents are determined for both partial regions that have the desired excess current in the first partial region, with the overall field B0 only slightly differing from the standard operating field of the magnet coil configuration. The operating currents are adjusted through initial charging of the overall magnet coil configuration, thereby taking into consideration the inductive coupling between the partial regions and after closing of the additional switch, by continued charging or discharging in the second partial region only. The method permits inexpensive testing of a superconductor in a series-produced NMR magnet under NMR conditions.