Solenoid Beam Collimation for High-Emittance Particle Transport

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Solution Overview

Problem

Existing beam transport systems face challenges in efficiently transporting charged particle beams with high emittance, leading to beam loss and device damage due to heat generation, as they require multiple devices and complex installations to prevent beam entry into accelerators, which complicates the process and increases costs.

Innovation Solution

A beam transport system with a magnetic field generation device and a beam shielding device that uses a magnetic field parallel to the beam's center orbit to gather and converge charged particles, allowing efficient transport by stopping particles outside a predetermined range using a collimator.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple solenoid magnetic fields and collimators are arranged at different locations to prevent beam loss, then the reliability of beam transport is improved, but the device complexity and space requirements increase

Engineering Contradiction:

Improvebeam transport reliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the beam gathering function and beam stopping function into a single integrated system. The collimator is positioned within the solenoid magnetic field region, allowing the magnetic field to perform both the gathering of on-axis particles and the spatial separation of off-axis particles in one location, eliminating the need for multiple separate devices at different locations.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent segments the beam particles based on their spatial position relative to the beam axis. By utilizing the solenoid magnetic field's focusing effect, particles are separated into on-axis particles (which remain confined) and off-axis particles (which are directed toward the collimator), enabling selective stopping without affecting the entire beam uniformly.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If a collimator is installed in a region without solenoid magnetic field to stop off-axis particles, then the manufacturing cost is reduced, but the beam transport efficiency decreases because particles outside acceptance are not effectively selected

Engineering Contradiction:

Improvemanufacturing costVSAvoidbeam transport efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent applies the solenoid magnetic field's gathering effect before the particles reach the collimator. This preliminary action of confining on-axis particles within the magnetic field region ensures that when particles reach the collimator, only off-axis particles are present to be stopped, making the collimation process more efficient and selective.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If the collimator stops particles spatially outside the beam axis, then the device complexity is reduced, but the manufacturing precision required increases to accurately select particles outside accelerator acceptance

Engineering Contradiction:

Improvedevice complexityVSAvoidparticle selection precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent replaces the need for complex mechanical positioning and adjustment mechanisms with a magnetic field-based particle selection system. The solenoid magnetic field naturally focuses on-axis particles through electromagnetic forces, providing precise particle selection based on physical principles rather than mechanical tolerances, thereby reducing manufacturing precision requirements.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 system effectively reduces beam loss and heat generation, enabling high-current acceleration by selectively stopping non-acceleratable particles, thus maximizing the accelerator's output and preventing device damage.

Implementation Method 1

a magnetic field generation device that is provided in a transport line that transports the charged particle beam and generates a magnetic field parallel to a center orbit of the charged particle beam

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

a beam shielding device that is provided in a region through which the charged particle beam in the magnetic field generation device passes, causes a charged particle beam in a predetermined range of the charged particle beam to pass through, and stops other charged particle beams

Methodology Applied

Scientific EffectElectromagnetic force: Lorentz Force

Data Source

PatentUS12598691B2Beam transport system and method, accelerator including beam transport system, and ion source including the accelerator

Publication Date: 2026.04.07 HITACHI HIGH TECH CORP

AI summary

A beam transport system for transporting a charged particle beam, includes a magnetic field generation device that is provided in a transport line that transports the charged particle beam and generates a magnetic field parallel to a center orbit of the charged particle beam, and a beam shielding device that is provided in a region through which the charged particle beam in the magnetic field generation device passes, causes a charged particle beam in a predetermined range of the charged particle beam to pass through, and stops other charged particle beams.