Synchrotron Beam Extraction via Stripping Foil and Magnetic Separation
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Solution Overview
Problem
Current methods for extracting particle beams, particularly carbon particles, from accelerators face challenges in maintaining energy levels and precision, leading to beam loss and reduced precision due to energy spread and residual activity in energy-reducing foils.
Innovation Solution
An apparatus and method involving a synchrotron with a central orbit, using a first magnet to deflect the beam, a stripping foil to create a stripped beam, and a second magnet to separate the stripped beam further from the central orbit, with a particle retainer returning the remaining beam to the orbit, ensuring precise extraction and delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an energy reducing foil is used to separate the particle beam, then the beam can be physically separated from the original stream, but the extracted beam has less energy and higher energy spread resulting in less precision
Solution Approach 1:
The invention extracts only the necessary component (stripped particles) from the beam without using an energy-reducing foil. By using a magnetic field to deflect and separate stripped particles directly, the beam maintains its original energy levels while achieving precise extraction, eliminating the energy loss and spread caused by foil-based methods.
Solution Approach 2:
The invention introduces a magnetic field as an intermediary to separate stripped particles from the circulating beam. This magnetic field acts as a mediator that can selectively deflect particles based on their charge state without physically reducing their energy, unlike the energy-reducing foil approach.
2Reliability
If an energy reducing foil is used to separate the particle beam, then the beam can be physically separated from the original stream, but residual activity remains in the foil causing beam particle loss
Solution Approach 1:
The invention removes the energy-reducing foil from the system entirely and replaces it with a magnetic field-based separation method. This eliminates the source of residual activity and beam particle loss while maintaining reliable extraction of stripped particles from the circulating beam.
Solution Approach 2:
The invention replaces the mechanical/physical foil-based separation system with a magnetic field-based system. This substitution eliminates the harmful residual activity generated in the foil while achieving the same beam separation function through electromagnetic interaction.
3Ease of operation
If a kicker magnet and septum magnet are used to extract the particle beam, then the beam can be moved horizontally towards the beam line, but this method is less suitable for carbon particles due to radiation limitations and control challenges
Solution Approach 1:
The invention extracts only the stripped particles from the beam using a magnetic field, allowing for more precise and controlled extraction compared to the kicker magnet and septum magnet method. This selective extraction reduces unnecessary radiation exposure while maintaining ease of operation for carbon particle beams.
Solution Approach 2:
The invention changes the extraction approach by using magnetic field deflection based on particle charge state rather than mechanical deflection through kickers and septums. This parameter change in the extraction mechanism makes the process more suitable for carbon particles by reducing radiation exposure while maintaining operational ease.
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 approach allows for precise extraction and delivery of carbon particle beams with maintained energy levels and reduced treatment time, enabling efficient tumor irradiation with high precision and control.
Implementation Method 1
at least one first magnet positioned to deflect the charged particle beam from the central orbit to a deflected path
Implementation Method 2
at least one stripping foil placed in at least parts of the deflected path, wherein at least a portion of the charged particle beam passing through the stripping foil becomes a stripped charged particle beam
Implementation Method 3
at least one second magnet encompassing the central orbit, the stripped charged particle beam, and a remaining charged particle beam, whereby paths of the stripped charged particle beam and the remaining charged particle beam are separated
Data Source
AI summary
This disclosure relates to apparatuses and methods for the extraction of particle beams while maintaining the energy levels and precision of the particles and the particle beam. Apparatuses and methods for extracting a charged particle beam from a central orbit in a synchrotron are provided, in which a particle beam is deflected from the central orbit. Parts of the deflected particle beam passes through a stripping foil placed in at least parts of the deflected path such that the particles that pass through the foil are stripped of at least one electron. The electron stripped particles and the non-stripped particles may be separated magnetically.