Particle Beam Transport via Horizontal Deflection Electromagnet
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Solution Overview
Problem
Conventional particle beam therapy systems face challenges in efficient space utilization due to momentum dispersion issues and beam size variations, particularly when the treatment chamber is arranged at a different height than the accelerator, leading to increased beam size and position deviations, which complicates forming a desired dose distribution.
Innovation Solution
A particle beam therapy system that includes a circular accelerator, a particle beam transport section with horizontal and perpendicular deflection electromagnets, where the horizontal deflection electromagnets are placed on a different floor than the particle beam irradiation unit, allowing for beam deflection parallel to the accelerator median plane to zero out momentum dispersion, thereby reducing beam size and position variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the treatment chamber is arranged on a different floor than the accelerator to reduce installation area, then space utilization is improved, but beam size increases and position deviation occurs due to non-zero momentum dispersion function
Solution Approach 1:
The patent introduces a horizontal deflection electromagnet that deflects the particle beam in the horizontal direction (parallel to the accelerator median plane), adding a dimensional component to the beam transport path. This allows the beam to be transported to a different floor while maintaining zero momentum dispersion function by compensating for vertical dispersion through horizontal deflection, thus resolving the contradiction between space utilization and beam position precision.
2Area of stationary object
If the treatment chamber is arranged on a different floor than the accelerator, then space utilization is improved, but beam region spreads and dose distribution uniformity deteriorates
Solution Approach 1:
By deflecting the particle beam horizontally in addition to vertically, the patent creates a two-dimensional deflection path. This dimensional change allows the beam to reach the treatment chamber on a different floor while maintaining proper beam convergence and minimizing beam region spread, thereby preserving dose distribution uniformity despite the vertical displacement.
3Manufacturing precision
If horizontal deflection electromagnet is added to deflect beam parallel to accelerator median plane, then momentum dispersion function becomes zero and beam precision is improved, but device complexity increases
Solution Approach 1:
The patent adds a horizontal deflection electromagnet that operates in a different dimension (horizontal plane) from the conventional vertical deflection electromagnets. This dimensional addition enables independent control of horizontal and vertical beam positions, allowing the momentum dispersion function to be zeroed out without interfering with the existing vertical deflection system, thus managing complexity through dimensional separation.
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 enhances space utilization efficiency on the treatment chamber floor by minimizing beam size and position variations, enabling a more uniform dose distribution and effective use of limited floor space.
Implementation Method 1
a particle beam transport section (5) which transports a particle beam (20) emitted from the circular accelerator (12)
Implementation Method 2
a first perpendicular deflection electromagnet (551) which deflects the particle beam (20) whose travelling direction is deflected by the horizontal deflection electromagnet (501)
Data Source
AI summary
A particle beam transport section comprises a horizontal deflection electromagnet which deflects a particle beam to a direction which is parallel to an accelerator median plane of a circular accelerator, a first perpendicular electromagnet which deflects a particle beam whose travelling direction is deflected by the horizontal deflection electromagnet to a direction which is different from a direction which is parallel to the accelerator median and a second perpendicular electromagnet which deflects the particle beam whose travelling direction is deflected by the first perpendicular deflection to a direction which is parallel to the accelerator median plane, wherein the horizontal deflection electromagnet is provided on a floor which is different from a floor where a particle beam irradiation unit is provided.