Circular Accelerator Inner-Side Beam Extraction

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Solution Overview

Problem

Existing circular accelerators face challenges in maintaining stability and securing sufficient spatial margin for beam extraction across a wide range of energy levels, leading to beam loss and interference issues with component devices, which complicates the extraction and output of beams.

Innovation Solution

The implementation of a circular accelerator design that includes beam deflectors, bending electromagnets, orbit adjusting electromagnets, and extraction electromagnets, which allow for multi-turn injection and slow extraction techniques, enabling beams to be injected from one side and extracted from the other, thereby maintaining stability and reducing beam size as energy increases, and utilizing third-order resonance to expand beam amplitude and extract beams from a resonant region.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the clearance between component devices and beam is increased to reduce beam loss and enable stable extraction, then beam extraction stability is improved, but the size of the circular accelerator needs to be increased

Engineering Contradiction:

Improvebeam extraction stabilityVSAvoidsize of circular accelerator

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent inverts the conventional approach by extracting beams from the inner side of the circulation orbit rather than from the outer side. This reversal allows the beam extraction path to be shorter and enables stable extraction with smaller clearance, thus avoiding the need to increase the overall accelerator size while maintaining reliable beam extraction across a wide energy range

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If the beam size is reduced as energy increases to maintain stable extraction, then beam extraction stability is improved, but the clearance margin becomes insufficient for low energy beams

Engineering Contradiction:

Improvebeam extraction stabilityVSAvoidclearance margin

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

By extracting beams from the inner side of the circulation orbit, the patent creates sufficient clearance margin for low energy beams that have larger transverse dimensions. The inverted extraction geometry provides adequate spatial margin for all energy levels while maintaining stable extraction, solving the clearance problem without compromising extraction reliability

Inventive Principle:

Principle #13The other way round (Inversion)

3Productivity

If beams are extracted from the outer side of the circulation orbit, then extraction is possible, but beam loss increases and stable extraction becomes difficult

Engineering Contradiction:

Improvebeam extraction capabilityVSAvoidbeam loss

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent extracts beams from the inner side of the circulation orbit, which is the opposite of conventional outer-side extraction. This inverted approach reduces beam loss by providing a more favorable extraction geometry with sufficient clearance, enabling stable beam extraction across a wide energy range from 140 MeV/u to 400 MeV/u without significant beam loss

Inventive Principle:

Principle #13The other way round (Inversion)

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 design allows for the stable extraction and output of beams over a wide range of energy levels without increasing the size of the circular accelerator, ensuring efficient beam handling and adjustment for particle beam therapy applications.

Implementation Method 1

beam bending electromagnets for forming a circulation orbit by causing the beam injected from the beam deflector for beam injections to circulate

Methodology Applied

Scientific EffectLorentz force: Lorentz Force

Implementation Method 2

beam extraction electromagnets adapted to adjust their respective quantities of magnetic excitation at the time of extraction of a charged particle beam and operate to draw out a charged particle beam in a resonant region located off a stable region of charged particle beams

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 3

beam extraction electromagnets adapted to adjust their respective quantities of magnetic excitation at the time of extraction of a charged particle beam

Methodology Applied

Scientific EffectLorentz force: Lorentz Force

Implementation Method 4

a beam deflector for beam injections adapted to inject a beam; and a beam deflector for beam extractions adapted to draw out the beam extracted from the resonant region to the outside

Methodology Applied

Scientific EffectLorentz force: Lorentz Force

Data Source

PatentUS9162082B2Circular accelerator and particle beam therapy apparatus

Publication Date: 2015.10.20 KK TOSHIBA

AI summary

One embodiment of a particle circular accelerator 1 includes: a beam deflector for beam injections, bending electromagnets that causes the beam injected from the beam deflector for beam injections to circulate so as to form a circulation orbit, orbit adjusting electromagnets for injected beams that shift the position of each injected beam relative to the center of the circulation orbit of the beam, quadrupole electromagnets and sextupole electromagnets that adjust their respective quantities of magnetic excitation at the time of a beam extraction so as to extract a beam in a resonant region off a stable reason of beams and a beam deflector for beam extractions that takes out the beam extracted from the resonant region to the outside. The circular accelerator 1 injects beams from the inner side thereof and emits beams to the outer side thereof.