Particle Therapy Accelerator Beam Extraction With Canceling Magnetic Field
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Solution Overview
Problem
Existing particle therapy accelerators face challenges in efficiently and satisfactorily extracting beams with variable energies due to disturbances in the resonant magnetic field caused by the extraction channel magnetic field.
Innovation Solution
The accelerator incorporates a main magnetic field generation device, a beam displacement device, an extraction channel magnetic field generation device, and a canceling magnetic field generation device to efficiently extract beams by displacing them outside the main magnetic field region and canceling out disturbance magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an extraction channel magnetic field is applied to extract the ion beam, then beam extraction is enabled, but disturbance to the resonant magnetic field occurs
Solution Approach 1:
A canceling magnetic field generation device is introduced as an intermediary element that produces a magnetic field opposite to the disturbance caused by the extraction channel. This mediator field cancels the harmful magnetic field components, allowing the extraction channel to function while maintaining resonant magnetic field stability.
Solution Approach 2:
The canceling magnetic field is generated in advance to counteract the disturbance field before it can significantly affect the resonant magnetic field. By applying the opposite magnetic field proactively, the system prevents disturbance accumulation and maintains field stability during beam extraction.
2Adaptability or versatility
If variable energy extraction is implemented, then treatment flexibility is improved, but extraction efficiency decreases due to magnetic field disturbances
Solution Approach 1:
The canceling magnetic field generation device acts as a mediator that enables variable energy extraction without compromising extraction efficiency. By neutralizing disturbance fields across different energy levels, it maintains high extraction efficiency while supporting the full range of variable energies needed for flexible treatment.
Solution Approach 2:
The system dynamically adjusts the canceling magnetic field parameters to match the extraction channel magnetic field parameters at each energy level. This parameter coordination ensures that disturbance cancellation remains effective across the entire variable energy range, maintaining extraction efficiency regardless of the selected energy level.
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 configuration allows for efficient and satisfactory extraction of beams with variable energies by minimizing disturbances in the resonant magnetic field, enhancing the extraction efficiency of both high and low-energy beams.
Implementation Method 1
a main magnetic field generation device that applies a main magnetic field to a space between a plurality of main magnetic poles arranged to face each other
Implementation Method 2
an extraction channel magnetic field generation device that generates an extraction channel magnetic field to extract the ion beam that has been moved to the outside
Implementation Method 3
a canceling magnetic field generation device that is provided to be closer to an inner periphery side than the extraction channel magnetic field generation device and generates a canceling magnetic field with a polarity opposite to a polarity of the extraction channel magnetic field
Implementation Method 4
an accelerator that accelerates an ion beam while causing the ion beam to circulate by a main magnetic field and an acceleration radiofrequency electric field
Data Source
AI summary
An accelerator capable of efficiently and satisfactorily extracting a beam is provided. A main magnet A101 applies a main magnetic field to a space between a plurality of main magnetic poles M202 arranged to face each other. An RF kicker M204 causes a beam circulating in a main magnetic field region to which the main magnetic field is applied to be displaced to outside of the main magnetic field region. An extraction channel magnetic field to extract the beam is generated. A canceling magnetic field generation device M214 is provided to be closer to an inner peripheral side than an extraction channel M207 and generates a canceling magnetic field with a polarity opposite to that of a disturbance magnetic field produced by an extraction channel.