Circular Accelerator Beam Extraction Using Frequency-Based Disturbance Fields
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Solution Overview
Problem
Existing particle therapy apparatuses face challenges in improving beam utilization efficiency due to deviations in frequency during betatron oscillation amplitude increase, leading to decreased efficiency in forming dose distributions matching target volumes.
Innovation Solution
A circular accelerator that applies a static magnetic field, a frequency-modulated radio frequency acceleration electric field, and a radio frequency disturbance electric field to extract charged particle beams, with the disturbance field generated based on the beam's circulation frequency or kinetic energy after acceleration, allowing for precise beam extraction and increased efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the betatron oscillation amplitude is increased by applying a radio frequency electric field to extract beams of various energies, then the beam energy variability is improved, but the beam utilization efficiency deteriorates due to frequency deviation suppressing the amplitude increase
Solution Approach 1:
The patent applies a dynamic magnetic field that varies with time to the charged particle beam during circulation. This dynamic field allows the beam to be extracted at different energies by controlling the timing and characteristics of the magnetic field variation, enabling both energy variability and maintaining extraction efficiency without frequency deviation issues
Solution Approach 2:
The patent changes the magnetic field parameters (strength and configuration) during the beam circulation and extraction process. By adjusting the magnetic field strength and applying disturbing fields at specific timings, the system can extract beams of various energies while maintaining optimal betatron oscillation amplitude increase and beam utilization efficiency
2Stability of the object's composition
If a static magnetic field is used to circulate the charged particle beam, then the magnetic field stability is improved, but the beam extraction capability for various energies deteriorates
Solution Approach 1:
The patent transitions from a purely static magnetic field to a dynamic magnetic field system. The dynamic field maintains stability during beam circulation but introduces controlled variations for extraction, combining the benefits of both static and dynamic field characteristics to achieve both stability and extraction versatility
Solution Approach 2:
The patent employs periodic application of disturbing magnetic fields during the beam circulation. These periodic disturbances are applied at specific phases and timings to increase betatron oscillation amplitude and enable beam extraction at desired energies, while the overall magnetic field structure remains stable
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
The solution enhances beam utilization efficiency by accurately controlling betatron oscillations, enabling precise beam extraction and improved dose distribution matching in particle therapy.
Implementation Method 1
a static magnetic field that circulates a charged particle beam
Implementation Method 2
a radio frequency acceleration electric field that is frequency-modulated and accelerates the charged particle beam
Implementation Method 3
a radio frequency disturbance electric field that extracts the charged particle beam
Data Source
AI summary
A circular accelerator (30) is a device that applies a static magnetic field that circulates a charged particle beam, a radio frequency acceleration electric field that is frequency-modulated and accelerates the charged particle beam, and a radio frequency disturbance electric field that extracts the charged particle beam, in which a circulation frequency of the charged particle beam circulating inside the circular accelerator (30) or kinetic energy of the charged particle beam is obtained after stopping the radio frequency acceleration electric field, and the radio frequency disturbance electric field is generated according to the obtained circulation frequency or kinetic energy. As a result, an accelerator and a particle therapy apparatus capable of improving beam utilization efficiency as compared with the related art are provided.