Multilayer Ion Pump Shielding for Compact Quantum Vacuum Cells
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Solution Overview
Problem
In compact systems utilizing quantum particles, current magnetic shielding is inadequate to mitigate the adverse effects of ion pump magnetic fields, leading to performance issues.
Innovation Solution
A multi-layer magnetic shield comprising a first layer with moderate relative magnetic permeability and high saturation magnetization, and a second layer with high relative magnetic permeability and moderate saturation magnetization, is used to surround at least a portion of the ion pump, effectively containing the magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If simple magnetic shielding is used for the ion pump, then magnetic field protection is provided, but the system size and weight increase
Solution Approach 1:
The magnetic shield is divided into multiple layers with different material properties. The first layer uses a material with moderate relative magnetic permeability and high saturation magnetization, while the second layer uses a material with high relative magnetic permeability and moderate saturation magnetization. This segmentation allows each layer to contribute differently to the overall shielding effect, achieving effective magnetic field protection with reduced total weight compared to a single thick shield.
Solution Approach 2:
The invention employs composite shielding structure combining two different magnetic shielding materials. The first layer material (moderate permeability, high saturation) and second layer material (high permeability, moderate saturation) work together synergistically. This composite approach provides superior shielding performance per unit weight compared to using a single material, directly addressing the contradiction between protection effectiveness and weight.
2Volume of moving object
If ion pump is placed close to magnetic field-sensitive sections, then system compactness is improved, but magnetic field interference increases
Solution Approach 1:
The multi-layer magnetic shield acts as an intermediary barrier placed between the ion pump (magnetic field source) and the magnetic field-sensitive sections. This intermediate shielding structure allows the system to maintain compact dimensions with the ion pump positioned close to sensitive sections, while the shield mediates the magnetic field interaction to prevent harmful interference.
Solution Approach 2:
The magnetic shield is strategically positioned and configured to provide localized protection specifically in the regions where magnetic field-sensitive components are located. The shield's structure and material properties are optimized for the specific geometric arrangement and field strength requirements of the compact system, enabling effective interference mitigation without requiring uniform shielding throughout the entire system volume.
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 multi-layer magnetic shield significantly reduces magnetic field leakage, allowing the ion pump to operate in close proximity to magnetic field-sensitive sections without adversely affecting system performance, enabling compact, high-vacuum systems for quantum particle applications.
Implementation Method 1
The multi-layer magnetic shield has a first layer and a second layer. The first layer is between the second layer and the ion pump. The first layer has a moderate relative magnetic permeability and a high saturation magnetization. The second layer has a high relative magnetic permeability and a moderate saturation magnetization.
Implementation Method 2
A multi-layer magnetic shield surrounds at least a portion of the ion pump, effectively containing the magnetic field.
Data Source
AI summary
A system including a vacuum cell, an ion pump, and a multi-layer magnetic shield is described. The vacuum cell includes a magnetic field-sensitive section, a pump section, and a channel section providing a vacuum conductance path between the magnetic field-sensitive section and the pump section. The ion pump is in the pump section. The multi-layer magnetic shield surrounds at least a portion of the ion pump. The multi-layer magnetic shield has a first layer and a second layer. The first layer is between the second layer and the ion pump. The first layer has a moderate relative magnetic permeability and a high saturation magnetization. The second layer has a high relative magnetic permeability and a moderate saturation magnetization.