ALD-Fabricated Microchannel Plate Electron Amplifiers
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Solution Overview
Problem
Current microchannel plate (MCP) detectors are limited by high manufacturing costs, brittleness, and limitations in electron gain due to etching processes, and the capillary glass method is labor-intensive and costly.
Innovation Solution
The development of a digital electron amplifier system using an atomic layer deposition (ALD) fabrication process to produce scalable MCPs with nanostructured functional coatings on low-cost borosilicate glass, enabling high gain, spatial resolution, and timing resolution, while reducing manufacturing costs through automated processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional MCP fabrication methods (multi-fiber glass working or capillary glass arrays) are used, then functional MCP detectors can be produced, but manufacturing costs are high and the process is labor-intensive
Solution Approach 1:
The patent replaces manual mechanical assembly operations with automated atomic layer deposition (ALD) processes. Instead of manually drawing, assembling, and etching glass fibers or manually aligning capillary arrays, the invention uses automated ALD to deposit functional coatings on glass substrates, eliminating labor-intensive steps and reducing manufacturing costs while maintaining high production efficiency
Solution Approach 2:
The patent changes the fabrication parameters by using ALD deposition thickness control to define channel dimensions and properties. By controlling deposition cycles and thickness parameters, the process achieves precise control over pore size, wall thickness, and secondary emission properties without requiring manual adjustment or complex assembly operations
2Manufacturing precision
If etching processes are used to create channels in lead silicate glass, then MCP detectors with specific channel dimensions can be produced, but electron gain is limited
Solution Approach 1:
Instead of etching channels into solid glass and then coating them, the patent inverts the approach by depositing functional layers on glass substrates and then forming channels through the deposited structure. This allows the channel walls to be defined by the deposited material layers rather than by etching into the glass, preserving more glass material and creating channels with optimized dimensions for higher electron gain
Solution Approach 2:
The patent creates composite structures combining glass substrates with deposited functional layers (such as aluminum oxide or other secondary emission materials). The composite structure allows the glass to provide mechanical support while the deposited layers provide the electron multiplication function, achieving both precise dimensional control and high electron gain
3Manufacturing precision
If lead silicate glass is used for MCP fabrication, then channels can be formed with specific properties, but the material is brittle and hygroscopic causing breakage during handling
Solution Approach 1:
The patent uses thin film deposition techniques to create functional layers on glass substrates, resulting in thinner, more flexible MCP structures. The deposited films create a protective and functional surface that reduces the brittleness issues of thick lead silicate glass while maintaining channel formation capabilities
Solution Approach 2:
The patent changes the material composition parameters by using alternative glass formulations or coating materials that reduce hygroscopicity and brittleness. By controlling deposition parameters and material selection, the process creates MCPs with improved mechanical durability while maintaining the necessary channel properties
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 ALD-fabricated MCPs offer high gain, spatial resolution, and low background rates, making them suitable for various applications, including neutron detection, at a significantly lower cost than traditional methods.
Implementation Method 1
The development of a digital electron amplifier system using an atomic layer deposition (ALD) fabrication process to produce scalable MCPs with nanostructured functional coatings
Implementation Method 2
Electron multiplier devices are used in many applications to multiply incidental charges through secondary emission. Electron multiplier devices can take a single electron, and via secondary emission, can induce emission of more electrons from an emissive material
Data Source
AI summary
Scalable electron amplifier devices and methods of fabricating the devices an atomic layer deposition (“ALD”) fabrication process are described. The ALD fabrication process allows for large area (e.g., eight inches by eight inches) electron amplifier devices to be produced at reduced costs compared to current fabrication processes. The ALD fabrication process allows for nanostructure functional coatings, to impart a desired electrical conductivity and electron emissivity onto low cost borosilicate glass micro-capillary arrays to form the electron amplifier devices.