Accelerator and particle beam therapy device
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Solution Overview
Problem
Existing particle therapy accelerators face challenges in efficiently and satisfactorily extracting beams of varying energies due to disturbances from extraction channel magnetic fields and resonant magnetic fields, which affect beam extraction efficiency and stability.
Innovation Solution
An accelerator design incorporating a main magnetic field generation device, beam displacement device, extraction channel magnetic field generation device, and canceling magnetic field generation device, where the canceling magnetic field has a polarity opposite to the extraction channel magnetic field, is used to efficiently extract beams by minimizing disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an extraction channel magnetic field is used to extract the ion beam, then beam extraction is enabled, but disturbance to the resonant magnetic field occurs
Solution Approach 1:
The invention uses the canceling magnetic field generation device to convert the harmful disturbance magnetic field generated by the extraction channel into a beneficial effect. By generating a magnetic field with opposite polarity that cancels the disturbance, the system maintains both beam extraction capability and magnetic field stability, turning the harmful interaction into a controlled balance between opposing fields
2Adaptability or versatility
If a resonant magnetic field is used for beam extraction, then variable energy extraction is achieved, but disturbance from extraction channel magnetic field affects extraction efficiency
Solution Approach 1:
The canceling magnetic field generation device acts as an intermediary between the extraction channel magnetic field and the resonant magnetic field. It mediates the interaction by introducing a third magnetic field component that counteracts the disturbing effects, allowing both variable energy extraction and high extraction efficiency to coexist through field superposition
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 efficient and satisfactory extraction of beams by reducing disturbances, improving extraction efficiency and stability across different energy levels.
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
a beam displacement device that causes the ion 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
Implementation Method 3
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 4
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
Data Source
Figure 1
Figure 2~3
Figure 4
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.