RF Cavity Betatron Oscillation for Charged Particle Beam Extraction
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Solution Overview
Problem
There is a need for efficient extraction of charged particles from a synchrotron in charged particle therapy systems to achieve precise and accurate treatment of solid cancerous tumors while minimizing damage to surrounding healthy tissue.
Innovation Solution
A charged particle beam extraction method using a radio-frequency (RF) cavity system to induce betatron oscillation, allowing the charged particle stream to interact with a material like a foil, reducing its energy and enabling separation from the original stream, followed by extraction using an applied field and deflector, allowing for controlled energy and intensity adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If charged particles are extracted from synchrotron for cancer therapy, then treatment precision and accuracy are improved, but extraction efficiency and control over energy/intensity are worsened
Solution Approach 1:
The patent applies RF fields that dynamically vary in frequency and amplitude to induce betatron oscillations in the charged particle beam. This dynamic modulation enables precise control over the extraction process, allowing independent adjustment of beam energy and intensity while maintaining high extraction efficiency. The dynamic nature of the RF fields permits real-time optimization of extraction parameters to match treatment requirements.
Solution Approach 2:
The invention changes physical parameters of the charged particle beam during extraction by using RF fields with variable frequency and amplitude. By modulating these parameters, the system achieves precise control over the extracted beam's energy and intensity, resolving the contradiction between extraction efficiency and beam quality control. The parameter changes enable the same extraction mechanism to produce beams with different characteristics as needed for various tumor treatments.
2Reliability
If charged particle beam is used to treat tumors, then cancer treatment effectiveness is improved, but damage to surrounding healthy tissue increases
Solution Approach 1:
The patent extracts only the necessary portion of the charged particle beam at a specific location and time from the synchrotron. By using RF fields to induce betatron oscillations and extract particles at a controlled point, the system delivers the beam precisely to the tumor location while leaving the surrounding healthy tissue undisturbed. This extraction approach ensures that only the required number of particles are delivered to the target, minimizing unnecessary exposure of healthy tissue.
Solution Approach 2:
The RF cavity system acts as an intermediary between the synchrotron and the tumor treatment area. It mediates the beam extraction process by inducing controlled oscillations that direct particles toward the extraction point, and subsequently controls the beam's energy and intensity before delivery. This intermediary mechanism enables precise spatial and temporal control, ensuring the beam hits the tumor accurately while protecting surrounding tissues from unnecessary radiation.
3Adaptability or versatility
If RF cavity system is used to induce betatron oscillation for beam extraction, then control over beam energy and intensity is improved, but device complexity increases
Solution Approach 1:
The RF cavity system serves multiple functions: it accelerates particles during storage, induces betatron oscillations for extraction, and controls the energy and intensity of the extracted beam. By making this single component multi-functional, the patent reduces the need for separate systems for each function, thereby managing device complexity while achieving versatile control over beam parameters. The same RF cavity structure handles particle dynamics, extraction timing, and beam characterization.
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
Enables precise and accurate delivery of charged particles to tumors with independent control over energy and intensity, minimizing damage to surrounding tissues and improving treatment precision.
Implementation Method 1
A charged particle beam extraction method using a radio-frequency (RF) cavity system to induce betatron oscillation
Implementation Method 2
The charged particle stream to hit a material, such as a foil. The foil decreases the energy of the charged particle stream
Implementation Method 3
The physically separated charged particle stream is then removed from the system by use of an applied field and deflector
Data Source
AI summary
The invention comprises a charged particle beam extraction method and apparatus used in conjunction with charged particle beam radiation therapy of cancerous tumors. The system uses a radio-frequency cavity system to induce betatron oscillation of a charged particle stream. Sufficient amplitude modulation of the charged particle stream causes the charged particle stream to hit a material, such as a foil. The foil decreases the energy of the charged particle stream, which decreases a radius of curvature of the charged particle stream in the synchrotron sufficiently to allow a physical separation of the reduced energy charged particle stream from the original charged particle stream. The physically separated charged particle stream is then removed from the system by use of an applied field and deflector.