Wien Filter Integrated Vacuum Pump for Beamline Pressure Control
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Solution Overview
Problem
Conventional Wien filters in particle accelerators create high vacuum challenges due to their large surface area and limited pump speed, leading to increased pressure within the beamline, which negatively affects the operation of polarized photoinjectors and accelerators.
Innovation Solution
Integration of a Wien filter with one or more Penning cells to create a dual-functionality device that acts as both a filtration system and a vacuum pump, utilizing orthogonal electric and magnetic fields to direct particles while employing ion pumps with titanium and tantalum plates for enhanced gas removal and chemical gettering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional Wien filter materials are used, then the filter structure is simple, but the vacuum pressure increases due to large surface area and limited pump speed
Solution Approach 1:
The patent merges the Wien filter structure with ion pump components by integrating Penning cells between the filter electrodes and incorporating titanium/tantalum plates as both filter elements and pumping surfaces. This combination allows the same structure to perform both filtration and vacuum pumping functions, increasing pump speed while managing surface area effects.
Solution Approach 2:
The titanium and tantalum plates serve multiple functions simultaneously: they act as Wien filter electrodes for particle selection, Penning cell components for ion generation, and chemical getter surfaces for gas absorption. This multi-functionality resolves the contradiction by eliminating the need for separate pump components that would add complexity.
2Stress or pressure
If the pump speed is increased to reduce pressure, then the vacuum quality improves, but the device complexity increases
Solution Approach 1:
The patent combines the Wien filter and ion pump into a single integrated device where the filter electrodes double as pump components. The Penning cells are embedded within the filter structure, and the titanium/tantalum plates serve both filtration and pumping roles, thereby increasing pump speed without adding separate pump assemblies.
Solution Approach 2:
The Wien filter structure provides its own pumping capability through the integrated Penning cells and reactive metal plates. The filter electrodes generate ions that are then captured by the same structural elements, making the system self-sufficient and eliminating the need for external pump systems.
3Quantity of substance
If titanium plates are used for pumping, then common gases are removed effectively, but noble gases like argon cannot be removed
Solution Approach 1:
The patent uses composite material construction with both titanium and tantalum plates. Titanium provides effective pumping for common gases through chemical gettering, while tantalum adds the capability to pump noble gases including argon, krypton, and helium. This composite approach achieves broad gas type coverage while maintaining effective removal of all major gas categories.
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 combined device significantly improves vacuum quality along the beamline, increasing pump speed to at least 30 L/s, reducing pressure variations, and extending the operating lifetime of photoguns by maintaining optimal beamline vacuum conditions.
Implementation Method 1
The vacuum pump is an ion pump including one or more cylindrical Penning cells to trap and expel electrons
Implementation Method 2
Metal plates on opposing sides of the Penning cells embed gas that is ionized by trapped electrons in the Penning cell thus creating vacuum by turning gas into solid
Implementation Method 3
A conventional Wien filter is a common device composed of orthogonal electric and magnetic fields, such that particles with the correct speed will travel through the device unaffected while other particles will be deflected
Data Source
AI summary
An integral Wien filter and vacuum pump for separating charged particles or for orienting their spin direction while maintaining optimal beamline vacuum. The vacuum pump is an ion pump including one or more cylindrical Penning cells to trap and expel electrons. The Wien filter includes orthogonal electric and magnetic fields to direct particles with the desired speed through the device while deflecting particles at undesired speeds. The Wien filter includes two electrodes, one biased positive and one biased negative, a dipole magnet, and means for reversing polarity of the electrodes to flip the spin of the charged particles. Metal plates on either side of the Penning cells embed gas that is ionized by trapped electrons in the Penning cell thus creating vacuum by turning gas into solid. The two metal plates can be configured to obtain vacuum pumping via chemical gettering and for removal of noble gases.