Ion Pump Anode Surface Texture for Sputter Control
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Solution Overview
Problem
Conventional ion pumps face inefficiencies due to sputtered material shedding from the anode, which can short the anode and cathode, reducing the pump's effectiveness and service life.
Innovation Solution
The ion pump features a contoured-textured anode surface with franging structures or a mesh design that captures and controls the size of sputtered material, preventing it from lodging between the anode and cathode and reducing shedding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ion pumps use a smooth anode surface, then the pump structure is simple and easy to manufacture, but sputtered material sheds from the anode surface and lodges between the anode and cathode, causing electrical shorts and reducing pump reliability
Solution Approach 1:
The anode surface is designed with different local properties: a smooth contoured surface in regions where sputtered material is likely to shed, and a textured surface with capture regions in areas where material deposition occurs. This local differentiation allows the anode to simultaneously prevent shedding in critical areas while capturing material in other areas, resolving the contradiction between reliability and structural simplicity.
Solution Approach 2:
The anode surface is segmented into distinct functional zones: contoured surfaces for material shedding control and textured surfaces with capture regions for material trapping. This segmentation allows each zone to perform its specific function optimally, preventing electrical shorts while managing sputtered material, thus improving reliability without requiring complete structural redesign.
2Object-affected harmful factors
If the anode surface is made textured with capture regions, then sputtered material shedding is reduced and electrical shorts are minimized, but the manufacturing complexity and precision requirements increase
Solution Approach 1:
The anode surface parameters are optimized to balance manufacturing feasibility with functional performance. The contoured surfaces use standard geometric parameters that are easy to manufacture, while the textured surfaces incorporate capture regions with dimensions and patterns that can be produced using conventional texturing methods. This parameter optimization reduces the need for ultra-precise manufacturing while still achieving the goal of minimizing electrical shorts.
3Duration of action of stationary object
If the anode surface is designed with contoured and textured regions, then the service life of the ion pump is extended by preventing material shedding, but the device complexity increases
Solution Approach 1:
Rather than redesigning the entire anode surface, the invention applies local quality modifications only where needed: contoured regions are implemented in areas prone to material shedding, and textured capture regions are added in specific zones. This localized approach extends pump service life without requiring complete anode replacement or complex overall redesign, thus limiting the increase in device complexity.
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 design enhances the reliability and service life of the ion pump by minimizing electrical shorts and sputtered material shedding, particularly beneficial in low-gravity environments where debris mobility is higher.
Implementation Method 1
material sputtered from at least one of the cathodes
Implementation Method 2
the electric field accelerates the ionized gas molecules into the cathode such that they impact with velocity sufficient to either lodge within the cathode or deposit within the enclosure as sputtered material
Data Source
AI summary
An ion pump includes an evacuateable envelope having a chamber. A first and a second cathode are disposed within the chamber and spaced apart from one another. An anode is spaced apart from and between the first and second cathodes. The anode has an anode body with a textured surface that defines capture regions for fixing material sputtered from the first and second cathodes and controlling size of sputter depositions shed from the anode.