Synchrotron Magnet Arrangement for Particle Therapy Downsizing
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Solution Overview
Problem
The existing particle therapy systems, including synchrotrons, face challenges in downsizing due to the large number of quadrupole magnets and extraction deflectors required, which limits the reduction of system size and cost, and increases beam size and beam loss.
Innovation Solution
A configuration where a single defocusing quadrupole magnet is arranged between multiple deflection magnets, and focusing quadrupole magnets are placed on the inlet side of the first extraction deflector and the outlet side of the second extraction deflector, reducing the number of quadrupole magnets and allowing for a smaller deflection angle, thereby downsizing the synchrotron while maintaining beam control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple quadrupole magnets are arranged between extraction deflectors to control beam size, then beam control is improved, but device complexity and system size increase
Solution Approach 1:
The patent combines multiple quadrupole magnets into a single integrated quadrupole magnet arrangement between the first and second extraction deflectors. This merging reduces the number of separate magnetic components while maintaining the necessary beam focusing and defocusing functions through optimized magnetic field design.
Solution Approach 2:
The single quadrupole magnet arrangement performs multiple functions: it focuses the beam in one direction while defocusing in the perpendicular direction, controls beam size during extraction, and maintains beam stability throughout the extraction process. This multi-functionality eliminates the need for separate dedicated focusing and defocusing magnets.
2Productivity
If more extraction deflectors and quadrupole magnets are used to maintain beam control during extraction, then beam extraction efficiency is improved, but system size and cost increase
Solution Approach 1:
The patent merges the functions of multiple extraction deflectors and quadrupole magnets into a more compact arrangement. The single quadrupole magnet is positioned to work in conjunction with the first and second extraction deflectors, creating a streamlined extraction system that achieves the same extraction efficiency in a smaller physical footprint.
Solution Approach 2:
The patent optimizes the spatial arrangement of the extraction components by utilizing three-dimensional positioning and angular orientation. The quadrupole magnet and deflectors are arranged in specific geometric configurations that maximize extraction efficiency while minimizing the horizontal and vertical space required for the system.
3Volume of stationary object
If the number of quadrupole magnets is reduced to downsize the synchrotron, then system size is reduced, but beam control capability may deteriorate
Solution Approach 1:
The patent changes the magnetic field parameters (strength, gradient, orientation) of the single quadrupole magnet to compensate for the reduction in the number of magnets. By optimizing these parameters, the single magnet achieves the same beam control effect that would otherwise require multiple magnets, thereby downsizing the system without sacrificing control capability.
Solution Approach 2:
The patent employs composite magnetic field design, combining the effects of the quadrupole magnet with the geometric arrangement and positioning of the extraction deflectors. This composite approach creates a synergistic system where the magnetic field and mechanical geometry work together to maintain beam control with fewer components.
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 reduces the space required for devices, suppresses beam size increase, and allows for efficient beam extraction with reduced beam loss, enabling the downsizing of the synchrotron while maintaining effective particle therapy capabilities.
Implementation Method 1
The deflection magnets 202 each deflect the injected beam and cause the beam to circulate in the synchrotron 200
Implementation Method 2
The focusing quadrupole magnets 203 each cause the beam to stably circulate in the synchrotron 200 and focus the beam in a horizontal direction
Implementation Method 3
The defocusing quadrupole magnets 204 each defocus the beam in the horizontal direction
Implementation Method 4
The radio frequency acceleration cavity 205 accelerates and decelerates the beam
Implementation Method 5
The resonance excitation multi-pole magnet 206 forms a separatrix for an oscillation (betatron oscillation) of the beam
Implementation Method 6
The extraction radio frequency device 207 increases the amplitude of the oscillation of the beam and thereby leads the beam to the outside of the separatrix
Implementation Method 7
The first extraction deflector 208 and the second extraction deflector 209 deflect the beam, change a path of the beam and cause the beam to be extracted from the synchrotron
Data Source
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AI summary
Disclosed herein are provided an arrangement of devices suitable to downsize a synchrotron, a synchrotron using such an arrangement, and a particle therapy system using the synchrotron. In the synchrotron 200, a plurality of deflection magnets 202 and a single defocusing quadrupole magnet 204 are arranged between a first extraction deflector 208 and a second extraction deflector 209. The defocusing quadrupole magnet 204 is arranged between deflection magnets 202 among the plurality of deflection magnets 202, a focusing quadrupole magnet 203 is arranged on the side of an inlet of the first extraction deflector 208, and a focusing quadrupole magnet 203 is arranged on the side of an outlet of the second extraction deflector 209.