Ceramic Electromagnetic Feedthrough Structure for Thermal Stress Relief

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Solution Overview

Problem

Existing electromagnetic field control members in accelerators face challenges in maintaining high-speed, high magnetic field power, and high repeatability while ensuring airtightness and durability over extended periods, particularly under conditions of repeated heating and cooling.

Innovation Solution

An electromagnetic field control member comprising a ceramic insulating member with multiple through holes, sealed by a conductive member made of metal, and power feed terminals that stabilize and secure airtightness, featuring a design that absorbs thermal stress and minimizes cracking through specific geometric configurations and materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single solid electrically conductive member is used to seal through holes in the insulating member, then airtightness is secured, but thermal stress concentration and cracking occur under repeated heating and cooling

Engineering Contradiction:

ImproveairtightnessVSAvoidresistance to thermal stress

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The electrically conductive member is divided into multiple rod-shaped members that are arranged in parallel to form a lattice structure. This segmentation allows each rod to independently expand and contract during thermal cycling, preventing stress concentration and cracking while maintaining the overall sealing function and airtightness of the through holes.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the electrically conductive member is made of metal to ensure conductivity and sealing, then electrical conductivity is improved, but thermal expansion differences cause stress and potential failure

Engineering Contradiction:

Improveelectrical conductivityVSAvoiddimensional stability under thermal cycling

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The metal electrically conductive member is segmented into multiple rod-shaped members forming a lattice. This segmentation allows the metal to maintain its excellent electrical conductivity while the distributed structure accommodates thermal expansion differences between the metal and ceramic, preventing stress concentration and maintaining dimensional stability under thermal cycling.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention creates a composite structure where multiple metal rod-shaped members are arranged in a lattice within the ceramic insulating member. This composite configuration combines the electrical conductivity of metal with the thermal stability of ceramic, while the lattice geometry provides stress relief during thermal expansion and contraction.

Inventive Principle:

Principle #40Composite materials

3Reliability

If through holes are sealed to maintain airtightness, then sealing performance is improved, but stress concentration occurs at the sealing interface

Engineering Contradiction:

ImproveairtightnessVSAvoidstress concentration

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The sealing structure is segmented into multiple rod-shaped members arranged in parallel. This segmentation distributes the sealing function across multiple elements, preventing stress concentration at any single interface while maintaining effective sealing of the through holes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The rod-shaped members are specifically positioned and dimensioned to provide localized sealing at the through hole interfaces. Each rod is optimized to seal its specific location, distributing the sealing stress evenly across the interface and preventing localized stress concentration that would lead to failure.

Inventive Principle:

Principle #3Local quality

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

Enhances stability and durability by reducing thermal stress and cracking, thereby maintaining airtightness and improving mechanical strength, ensuring reliable operation under cyclic thermal conditions.

Implementation Method 1

an electrically conductive member having a long shape and sealing off the plurality of through holes

Methodology Applied

Scientific EffectSealing:

Implementation Method 2

a plurality of power feed terminals each having a plate shape and configured to bond with the electrically conductive member in a respective one of the plurality of through holes to supply electricity from the outside

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS12542221B2Electromagnetic field control member

Publication Date: 2026.02.03 KYOCERA CORP

AI summary

An electromagnetic field control member includes an insulating member made of a ceramic having a cylindrical shape, the insulating member including a plurality of through holes extending along an axial direction; an electrically conductive member configured to seal off each of the plurality of through holes, the electrically conductive member comprises a plurality of rod-shaped members connected to each other along the axial direction; and a plurality of power feed terminals each having a plate shape and configured to bond with the electrically conductive member in a respective one of the plurality of through holes to supply electricity from the outside.