Superconducting Magnet Large Crossing Warm Bore
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Solution Overview
Problem
Current high magnetic field superconducting magnet systems have a crossing warm bore that is not large enough, limiting their ability to provide strong magnetic fields in multiple directions, which is essential for scientific instruments and extreme condition studies.
Innovation Solution
A conduction-cooled superconducting magnet system using NbTi and high temperature superconductors, with a large crossing warm bore, where the high magnetic field area employs high temperature superconductors and the low magnetic field area uses NbTi, operating at 4K to generate a central magnetic field of 10 T, and featuring a cryocooler for direct cooling and quench protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the crossing warm bore is enlarged to allow multi-dimensional access to magnetic field, then the applicability forscientific instruments is improved, but the electromagnetic force on coils increases and structural stability deteriorates
Solution Approach 1:
The patent divides the superconducting magnet system into multiple independent coil sets (first set and second set) with different orientations. Each coil set generates magnetic field in specific directions, allowing the crossing warm bore to be enlarged for multi-dimensional access while distributing electromagnetic forces across separate coil structures rather than overloading a single coil system
Solution Approach 2:
Different coil sets are designed with locally optimized properties - each set is tailored to generate magnetic field in specific directions required by the application. The first coil set optimizes for one direction while the second set optimizes for another direction, allowing the structure to accommodate large crossing warm bore while maintaining local structural integrity under directional electromagnetic forces
2Force
If conventional low temperature superconducting magnets are used, then magnetic field strength can reach 15-17 T, but the crossing warm bore remains small and multi-dimensional access is limited
Solution Approach 1:
The patent transitions from a single-direction magnetic field approach to a multi-dimensional magnetic field system by introducing coil sets oriented in different directions. This dimensional expansion allows the crossing warm bore to be enlarged in multiple directions simultaneously, enabling instruments to access strong magnetic fields from various angles while maintaining high field strength through the combined effect of multiple coil sets
3Force
If the operating temperature is reduced to 1.8K for maximum magnetic field, then magnetic field can reach 22.3 T, but system complexity and cooling requirements increase significantly
Solution Approach 1:
The patent adopts a higher operating temperature of 4K instead of 1.8K, which represents a significant parameter change in the operating conditions. This temperature increase simplifies the cooling system requirements while the use of high temperature superconducting materials compensates for the reduced current density, maintaining sufficient magnetic field strength without the extreme cooling complexity required for 1.8K operation
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
The system significantly improves coil efficiency, reduces coil separation distance, and allows stable operation with a magnetic field exceeding 10 T, enabling access to strong magnetic fields in two-dimensional directions, thus enhancing scientific research capabilities.
Implementation Method 1
a high magnetic field conduction-cooled superconducting magnet is convenient for system operation
Implementation Method 2
a cryocooler is employed to directly cool a superconducting magnet
Implementation Method 3
the superconducting magnet can provide a maximum magnetic field up to 22.3 T when the operating temperature reaches 1.8K
Implementation Method 4
Bi-based tape has a current density of Jc=104-105 A/cm2 within a temperature range of 20 ̃30K, even under a relatively high magnetic field
Data Source
AI summary
A high magnetic field superconducting magnet system with large crossing warm bore is disclosed, a superconducting coil thereof includes a low temperature superconducting coil and a high temperature superconducting coil. The superconducting coils are connected to a thermal shield and a flange of a low temperature container by a supporting drawbar, thus the superconducting coils as a whole are supported inside the low temperature container. A thermal switch is connected to a primary cold head and a secondary cold head of the cryocooler. The secondary cold head of the cryocooler is connected to a magnet-reinforced supporting flange at the two ends of the low temperature superconducting coil and the high temperature superconducting coil by a cold conduction strip. The superconducting magnet system has a room temperature bore in horizontal direction and a room temperature bore in vertical direction. A thermal shield outside the room temperature bore in horizontal direction is used for preventing thermal radiation by the room temperature bore in horizontal direction to the superconducting coils. A separation supporting frame separates the low temperature superconducting coil and the high temperature superconducting coil into two parts, such that a two-dimensional room temperature space can be included inside the superconducting magnet when the superconducting magnet system is formed as a whole.