Accelerator Deflection Electromagnet Control for Smooth Energy Extraction
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Solution Overview
Problem
Conventional accelerator control methods in particle-beam radiation treatment systems face challenges in maintaining precise energy control of charged particles during acceleration and deceleration, leading to current deviations and position jumps, which prolong treatment times and require hardware adjustments.
Innovation Solution
A control method and device that generate a current-value instruction signal with smooth transitions and adjustable smoothing regions to match energy changes, using a current signal generator to optimize current changes in deflection electromagnets, reducing position jumps and eliminating the need for hardware adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the current of the deflection electromagnet is abruptly changed to a constant value during decrease change, then the energy can be maintained at a constant value, but the current response is not performed in time, causing current deviation and position jump of charged particles
Solution Approach 1:
The patent applies dynamics by making the current control signal time-variable with smooth transitions. Instead of using a static abrupt change, the current signal dynamically adjusts through smoothing regions before and after the constant value portion, allowing the deflection electromagnet current to respond accurately without causing position jumps while maintaining constant energy during extraction.
Solution Approach 2:
The patent applies preliminary action by providing smoothing regions before the current value reaches the constant value. This preliminary smoothing prepares the current transition in advance, ensuring that when the current reaches the constant value for constant energy extraction, the transition has already been smoothed to prevent position jumps and maintain reliability.
2Reliability
If a smoothing region is provided before and after the current value is changed to a constant value, then smooth transition of current is achieved, but the acceleration cycle time is prolonged
Solution Approach 1:
The patent applies parameter changes by optimizing the duration and shape of the smoothing regions in the current control signal. By carefully adjusting the parameters of the smoothing function (such as the transition width and curvature), the patent achieves sufficiently smooth current transitions to prevent position jumps while minimizing the time spent in smoothing regions, thus reducing the overall acceleration cycle time.
3Adaptability or versatility
If multiple types of energies are generated by using hardware devices such as range shifters, then subdivided types of energies can be achieved, but switching time is required and hardware maintenance is needed
Solution Approach 1:
The patent applies mechanics substitution by replacing the mechanical hardware system (range shifters) with an electrical control system. Instead of physically switching hardware components to generate different energy types, the patent uses a control device to generate different current control signals that directly produce the desired energy types, eliminating mechanical switching time and maintenance requirements while maintaining adaptability.
4Adaptability or versatility
If the number of acceleration cycles is increased to generate more energy types, then more subdivided energies can be extracted, but the treatment time is prolonged
Solution Approach 1:
The patent applies universality by designing a single acceleration cycle that can produce multiple extraction energies through different current control signal patterns. The control device can generate various energy types within one acceleration cycle by adjusting the current signal parameters, making the acceleration system multi-functional and eliminating the need for multiple separate acceleration cycles, thus improving treatment efficiency while maintaining versatility.
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 enhances the efficiency of particle-beam radiation treatment systems by shortening acceleration cycles and treatment times while maintaining precise energy control, improving processing efficiency and reducing hardware requirements.
Implementation Method 1
a magnetic field generated by a deflection electromagnet in the main accelerator
Implementation Method 2
The charged particles are caused to revolve along a predetermined orbit by a magnetic field
Implementation Method 3
a power supply configured to supply a current that generates the magnetic field to the deflection electromagnets
Data Source
AI summary
A control method for an accelerator according to the present embodiment is a control method for an accelerator that supplies a current generating a magnetic field to a plurality of deflection electromagnets based on a current-value instruction signal. The method includes providing a flat region that makes a current value of the deflection electromagnet constant in a case of an acceleration cycle involving emission of the charged particles, not providing the flat region in the current-value instruction signal in a case of an acceleration cycle, smoothing time change of a current value in a transition of the current value to the flat region or a transition from the flat region, and determining a time required for the smoothing based on a predetermined energy for extracting the charged particles or a difference between energies before and after change to the predetermined extraction energy.