Particle Therapy Accelerator Magnetic Field Layout for Ion Beam Extraction
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Solution Overview
Problem
The existing particle therapy systems face inefficiencies in ion beam extraction due to increased amplitude in the vertical direction, which decreases extraction efficiency.
Innovation Solution
An accelerator system with a main magnetic field generation device, an extraction channel, and a disturbance magnetic field region that includes specific magnetic field strength variations to guide the ion beam efficiently to the extraction channel, comprising a peeler region with decreasing magnetic field strength, a regenerator region with increasing strength, and a flat region with a moderate magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ion beam passes through the peeler magnetic field and regenerator magnetic field to increase horizontal betatron oscillation amplitude, then the horizontal extraction efficiency is improved, but the vertical amplitude increases which decreases extraction efficiency
Solution Approach 1:
A flat region is introduced as an intermediary zone between the peeler and regenerator magnetic field regions. This flat region acts as a buffer that prevents excessive vertical amplitude growth while allowing the horizontal extraction process to proceed effectively
Solution Approach 2:
The magnetic field structure is divided into three distinct regions with different local characteristics: the peeler region with decreasing field strength, the flat region with moderate field strength, and the regenerator region with increasing field strength. Each region is optimized for its specific function in the extraction process
2Ease of operation
If the amplitude of ion beam in vertical direction increases, then the horizontal extraction is facilitated, but the extraction efficiency decreases
Solution Approach 1:
The flat region converts the potentially harmful effect of vertical amplitude increase into a beneficial outcome by providing a transition zone that maintains horizontal extraction facilitation while controlling vertical growth through its specific magnetic field characteristics
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 improves ion beam extraction efficiency by stabilizing the ion beam's trajectory and reducing vertical amplitude, allowing for more precise and efficient extraction of ion beams across a range of energies.
Implementation Method 1
a main magnetic field generation device including a plurality of magnetic poles arranged to face each other and exciting the main magnetic field in a space sandwiched between the magnetic poles
Implementation Method 2
a disturbance magnetic field region provided on an outer peripheral portion of the main magnetic field region, the disturbance magnetic field region being configured to excite a magnetic field that disturbs the ion beam displaced outward and guides the ion beam to the extraction channel
Implementation Method 3
accelerates the ion beam circulating in the circular accelerator to desired energy, and then feeds a radiofrequency electric field
Implementation Method 4
The ion beam to which the radiofrequency electric field is fed passes through a magnetic field region called a peeler magnetic field and a regenerator magnetic field in which an amplitude in a horizontal direction of betatron oscillation, which is oscillation centered on a central orbit, gradually increases to generate resonance of the betatron oscillation
Data Source
AI summary
A disturbance magnetic field region provided in an outer peripheral portion of a main magnetic field region of an accelerator has a peeler region in which a strength of a magnetic field decreases toward an outside, a regenerator region in which the strength of the magnetic field increases toward the outside, and a substantially flat region in which the strength of the magnetic field is larger than the strength of the magnetic field of the peeler region and smaller than the strength of the magnetic field of the regenerator region.