Superconducting Coil Layout for Tunable Magnetic Field Profiles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing superconducting magnet devices for single crystal pulling devices have limited control over magnetic field distribution, restricting the ability to finely adjust oxygen concentration in semiconductor crystals, which varies by application.
Innovation Solution
A superconducting magnet device with a tubular cryostat and two independent superconducting coil sets, allowing for precise control of magnetic field distributions by adjusting the currents to the first and second superconducting coil sets, generating convex shapes on the X and Y axes, enabling flexible magnetic field configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single superconducting coil is used to generate magnetic field, then the device structure is simple, but the magnetic field distribution control is limited and cannot achieve fine adjustment of oxygen concentration
Solution Approach 1:
The single superconducting coil is divided into two independent superconducting coils (first and second coils). Each coil can be controlled independently to generate different magnetic field distributions. This segmentation allows for fine adjustment of magnetic field characteristics and oxygen concentration control without requiring a completely complex multi-component system
Solution Approach 2:
The invention introduces independent current control for each coil, enabling dynamic adjustment of magnetic field distribution. By varying the current magnitude and direction in each coil separately, the system can adaptively control the magnetic field to achieve desired oxygen concentrations for different semiconductor applications
2Adaptability or versatility
If current direction is switched in existing coils to change magnetic field distribution, then some magnetic field configurations can be achieved, but fine control and continuous adjustment are limited
Solution Approach 1:
The invention changes the control parameter from discrete current direction switching to continuous current magnitude adjustment. By independently controlling the current magnitude in each coil (I1 and I2), the system achieves continuous and precise adjustment of magnetic field distribution, enabling fine control of oxygen concentration rather than limited discrete configurations
3Manufacturing precision
If multiple independent superconducting coils with independent current control are introduced, then precise magnetic field distribution control is achieved, but the device complexity increases
Solution Approach 1:
The two superconducting coils are designed with identical or similar structural characteristics, allowing them to perform the same basic function of generating magnetic field. This universality simplifies the overall system design and manufacturing while still achieving precise control through independent operation. The power supply system, though more complex, uses a modular approach with independent but similar control channels for each coil
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 solution allows for more precise control of magnetic field distributions, improving the suppression of heat convection and oxygen concentration in semiconductor crystals, enhancing crystal quality and manufacturing efficiency.
Implementation Method 1
the first superconducting coil set generates a magnetic field distribution, which is convex downward on the X axis and convex upward on the Y axis when the first exciting current is supplied
Implementation Method 2
the second superconducting coil set generates a magnetic field distribution, which is convex upward on the X axis and convex downward on the Y axis when the second exciting current is supplied
Implementation Method 3
A strong magnetic field generated by a superconducting magnet can suppress heat convection in the melt of a semiconductor material
Data Source
AI summary
A superconducting magnet device includes a tubular cryostat defining a central cavity therein, a first superconducting coil set and a second superconducting coil set disposed outside the central cavity and inside the tubular cryostat, and a power supply system being capable of controlling a magnitude of a first exciting current to the first superconducting coil set and a magnitude of a second exciting current to the second superconducting coil set independently of each other. The first superconducting coil set generates a magnetic field distribution, which is convex downward on an X axis and convex upward on a Y axis when the first exciting current is supplied, in the central cavity. The second superconducting coil set generates a magnetic field distribution, which is convex upward on the X axis and convex downward on the Y axis when the second exciting current is supplied, in the central cavity.