Deformable Acceleration Cavity Upper Face for Resonance Tuning

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Solution Overview

Problem

Tuning of superconducting acceleration cavities requires significant space and high deformation forces, making it challenging to adjust resonance frequencies without occupying space between adjacent cavities, especially in compact accelerator designs.

Innovation Solution

The superconducting acceleration cavity features a deformation adjustment portion on its upper face, allowing for resonance frequency changes by deforming the upper face portion without interfering with adjacent cavities, using a bolt and rib configuration that applies a pressing force to elastically or plastically deform the cavity, enabling tuning during operation or pre-tuning without occupying additional space.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a tuner is used to deform the acceleration cavity for resonance frequency adjustment, then the resonance frequency can be tuned, but a large space is required between adjacent cavities to accommodate the tuner structure

Engineering Contradiction:

Improveresonance frequency adjustment capabilityVSAvoidspace between adjacent cavities

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The invention extracts the tuning function from a separate external tuner device and integrates it directly into the acceleration cavity structure itself. The cavity body is designed with a deformable portion that can be directly actuated, eliminating the need for a separate tuner structure that would occupy space between cavities.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The tuning mechanism is nested within the cavity structure. The deformable portion of the cavity body is positioned such that it can be actuated from the end face of the cavity, with the deformation occurring internally within the cavity volume rather than requiring external space.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

If the cavity is deformed by plastic deformation for pre-tuning, then a wide range of resonance frequency adjustment is achieved, but the cavity structure is permanently altered

Engineering Contradiction:

Improveresonance frequency adjustment rangeVSAvoidcavity structure stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The invention creates a dynamic tuning system where the cavity shape can be changed on demand. A deformable portion is provided that can be elastically deformed by an actuator during operation, allowing the cavity to adapt its resonance frequency dynamically without permanent structural alteration.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the physical state of the cavity wall from rigid to deformable in a controlled manner. By providing a deformable portion with different mechanical properties than the main cavity body, the system can alter the cavity shape parameter temporarily for tuning purposes while maintaining overall structural stability.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the cavity is deformed by elastic deformation for operation tuning, then the resonance frequency can be recovered when changed by operating conditions, but the adjustment range is limited

Engineering Contradiction:

Improveresonance frequency recovery capabilityVSAvoidresonance frequency adjustment range

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The cavity is segmented into a rigid main body and a deformable portion. This segmentation allows the deformable portion to provide elastic recovery for frequency stabilization while the overall cavity design maintains sufficient adjustment range through controlled deformation of this specific segment.

Inventive Principle:

Principle #1Segmentation

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 allows for efficient adjustment of resonance frequencies without increasing the overall size of the accelerator, maintaining the accelerating field integrity and enabling compact designs by deforming the upper face portion of the cavity, thus optimizing space usage.

Implementation Method 1

reversible adjustment of the cavity shape by elastically deforming the cavity

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

adjustment of the length of some of parts assembled to the inside of the cavity, changing of the cavity shape by plastically deforming the cavity

Methodology Applied

Scientific EffectPlastic deformation: Plasticity

Data Source

PatentEP3454629B1Acceleration cavity, accelerator, and method for adjusting resonance frequency of acceleration cavity

Publication Date: 2021.11.24 MITSUBISHI HEAVY IND MACHINERY SYST LTD

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AI summary

An objective of the invention is to provide an acceleration cavity, an accelerator, and a resonance frequency adjustment method of an acceleration cavity that can change the natural resonance frequency of the acceleration cavity without occupying space between adjacent accelerator cavities. A QWR includes: a body portion whose axial direction is parallel to the vertical direction, and having a cylindrical side face portion; an upper face portion 6 provided in an upper part of the body portion and is a plate-shaped member; and a deformation adjustment portion 20 applying a pressing force on the upper face portion 6 to deform the upper face portion 6.