Native Oxide Dynodes for Flexible Discrete Electron Multipliers
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Solution Overview
Problem
Conventional discrete dynode electron multiplier (DDEM) fabrication methods are costly and labor-intensive due to the need for applying a secondary electron emissive (SEE) coating on metal sheet dynodes, limiting design flexibility and precision in shaping and assembly.
Innovation Solution
The fabrication of DDEM using native metal oxide materials like Al2O3 or BeO, grown through oxidation, eliminates the need for a SEE coating, allowing for machining of dynodes from metal blocks (Al, Al alloys, or BeCu) into various geometries and shapes, with bonding to ceramics or glass for precise alignment and high-performance electron transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a SEE coating is applied on metal sheet dynodes, then secondary electron emission performance is improved, but manufacturing cost and labor intensity increase significantly
Solution Approach 1:
The invention merges the dynode substrate and SEE coating into a single integrated component by growing the oxide coating directly on the metal block before machining. This eliminates the separate coating application step and reduces assembly complexity, resolving the contradiction between performance and manufacturability.
Solution Approach 2:
The oxide coating is grown on the metal block before machining operations. This preliminary formation of the SEE layer allows subsequent precise machining of dynode geometries without requiring post-machining coating application, significantly reducing manufacturing steps and costs.
2Ease of operation
If metal sheet dynodes are used with SEE coating, then electron multiplication function is achieved, but design flexibility and shaping precision are limited
Solution Approach 1:
The invention segments the manufacturing process into distinct stages: oxide growth on bulk metal, then separate machining of individual dynode components. This allows each dynode to be precisely shaped from solid metal blocks with complex geometries that cannot be achieved with sheet metal forming, enhancing design flexibility while maintaining electron multiplication functionality.
3Reliability
If SEE coating is applied on dynode surface, then secondary electron emission is enhanced, but coating breakage or damage occurs due to material dissimilarity
Solution Approach 1:
The invention uses a composite structure where an oxide coating (Al2O3 or BeO) is grown directly on a metal substrate (Al, Al alloy, or BeCu). This creates a metallurgically bonded composite material where the oxide layer provides secondary electron emission while the metal substrate provides mechanical strength, eliminating coating delamination issues.
4Ease of operation
If individual dynodes are assembled manually on electrically insulated structure, then DDEM device is constructed, but assembly time and labor cost increase
Solution Approach 1:
The invention merges multiple dynode components into a single integrated metal block structure with pre-formed electrical insulation features. This integration eliminates the need for manual assembly of individual dynodes onto insulated supports, dramatically reducing assembly time and labor costs while maintaining device functionality.
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 approach reduces manufacturing costs, enhances design flexibility, and improves device performance by eliminating coating-related issues, enabling precise shaping and assembly of dynodes for efficient electron multiplication.
Implementation Method 1
The fabrication of DDEM using native metal oxide materials like Al2O3 or BeO, grown through oxidation
Implementation Method 2
made possible by use of high secondary electron emissivity materials such as Al2O3, BeO, SiO2 and MgO. The electrons are multiplied after impacting the surface. This effect produces more secondary electrons
Implementation Method 3
An electron multiplier is a device based on avalanche effect through electron multiplication. The electrons are multiplied after impacting the surface. This effect produces more secondary electrons and the process repeats itself after multiple surfaces creating the avalanche effect
Data Source
AI summary
Techniques produce integrated native metal oxide discrete elements which can be used to fabricate discrete dynode electron multiplier (DDEM) devices, for example by creating dynodes with a native oxide as secondary electron emissive (SEE) layer from a metal block. The metal block may comprise or consist of a metal base component, for example Al, Al alloys or BeCu, of metal oxide SEE materials Al2O3 or BeO. Growing a native oxide from these base metals, Al2O3 or BeO eliminates the need of a costly and time-consuming SEE coating on the dynode surface. Furthermore, aluminum alloys offer intrinsic dopant, in particular magnesium where its oxide provides a higher secondary electron yield than the aluminum oxide. The use of aluminum, its alloys or BeCu material block allows flexibility in design and fabrication of DDEM without an SEE coating process.