Dielectric Gradient Insulator Structure for Vacuum Flashover Resistance
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Solution Overview
Problem
High voltage vacuum insulators in charged particle beam accelerators face challenges such as surface flashover and metal evaporation, leading to voltage breakdown, and existing manufacturing methods like brazing are complex and inefficient, limiting the performance and reliability of high gradient insulators.
Innovation Solution
A dielectric high gradient insulator (DHGI) composed of multiple dielectric layers with varying dielectric constants, arranged to create a shaped electric field that deflects negatively charged particles away from the surface, eliminating the need for metal layers and simplifying the manufacturing process by using a stack of dielectric layers with different dielectric constants and a densification process like sintering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal layers are used in high gradient insulator to absorb secondary electrons and prevent avalanche formation, then voltage breakdown resistance is improved, but manufacturing complexity increases due to brazing requirements and vacuum arc risks
Solution Approach 1:
The patent removes metal layers entirely from the insulator structure, extracting the problematic component while preserving the essential function of preventing secondary electron avalanches through dielectric material design alone. This eliminates brazing operations and vacuum arc risks associated with metal layers.
Solution Approach 2:
The patent changes the fundamental parameter of material composition from metal-dielectric composite to all-dielectric structure. By modifying the dielectric constant gradient and material properties, it achieves electron avalanche prevention without requiring metal layers, thus simplifying manufacturing while maintaining reliability.
2Ease of manufacture
If brazing is used to join metal and ceramic layers, then structural assembly is achieved, but mechanical strength and vacuum integrity deteriorate compared to monolithic insulators
Solution Approach 1:
The patent merges multiple dielectric layers into a co-sintered monolithic structure, eliminating the need for brazing operations. The layers are bonded together through a single sintering process that creates continuous grain structure across interfaces, achieving both assembly capability and superior mechanical strength comparable to monolithic insulators.
Solution Approach 2:
The patent uses composite dielectric materials with varying dielectric constants that are co-sintered together. This creates a composite structure where different dielectric materials are bonded at the molecular level through sintering, achieving both functional requirements and structural integrity without weak brazed joints.
3Reliability
If dielectric layers with varying dielectric constants are stacked to create shaped electric field, then particle deflection and avalanche prevention are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates alignment features directly into the green bodies before sintering, such as protrusions and recesses that guide precise layer positioning. This preliminary alignment action ensures proper positioning is achieved during assembly, and the co-sintering process permanently locks these alignments, eliminating the need for post-assembly precision adjustments.
Solution Approach 2:
The patent modifies the sintering parameters and green body properties to enable self-alignment during the sintering process. By controlling shrinkage characteristics and using appropriate bonding mechanisms, the layers automatically position themselves correctly during co-sintering, reducing the stringency of pre-alignment requirements while maintaining final precision.
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 DHGI effectively inhibits voltage breakdown by deflecting secondary electrons and preventing avalanche formation, while offering improved manufacturability and mechanical stability compared to traditional metal-ceramic insulators, allowing for smaller, more efficient insulator designs in high voltage applications.
Implementation Method 1
The layers are aligned along a longitudinal axis and are configured to form a shaped electric field in a region proximal to a surface of the layers
Implementation Method 2
The shaped electric field deflects negatively charged particles, such as negative ions and secondary electrons, away from the surface, thereby inhibiting avalanche formation and voltage breakdown of the insulator
Implementation Method 3
a densification process like sintering
Data Source
AI summary
A dielectric high gradient insulator device comprises a stack of at least two dielectric layers which are in physical contact with each other and which have different dielectric constants. At least two dielectric layers are configured to form a shaped electric field, when the device is placed between electrodes having a voltage difference. The shaped electric field is in a region proximal to a surface of the at least two dielectric layers, and causes deflection of negatively charged particles away from the surface, thereby inhibiting voltage breakdown of the device. A method of manufacturing the device is also presented.