Laser Ion Source Particle Accelerator for Cancer Therapy
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Solution Overview
Problem
Conventional particle accelerators face challenges in raising the amplitude value of the circulating current, which is essential for effective scanning irradiations and cancer therapy, due to limitations in ion beam injection techniques and the short pulse width of laser ion sources.
Innovation Solution
A particle accelerator system incorporating a laser ion source with a beam pulse width of not greater than 2 μsec, a linear accelerator, a synchrotron, and a bump magnet with a control unit to synchronize magnetic excitation with the pulse timing of the laser ion source, enabling multi-turn injection and improving ion beam utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional ECR ion source is used to generate carbon ions, then the ion beam can be extracted as a DC beam, but the amperage is limited to several hundred μA which is insufficient for cancer therapy
Solution Approach 1:
The patent employs periodic pulsed laser irradiation to generate ion beams in short pulses (≤2 μsec) with high peak amperage (mA range). This periodic action allows the system to accumulate sufficient total ion quantity through multiple pulses while maintaining beam stability through controlled timing and synchronization with the synchrotron circulation period.
Solution Approach 2:
The patent performs preliminary action by pre-synchronizing the laser pulse timing with the synchrotron circulation period and pre-positioning the bump magnet excitation timing. This ensures that each injected ion pulse is properly timed to follow the circulating beam path, enabling reliable multi-turn injection without timing conflicts.
2Quantity of substance
If a laser ion source with short pulse width (≤2 μsec) is used to increase peak amperage, then high current can be extracted, but it is difficult to perform multi-turn injection because the pulse width is shorter than the synchrotron circulation time
Solution Approach 1:
The patent applies dynamics by making the bump magnet excitation timing variable and controllable. The excitation timing is dynamically adjusted to coincide with each laser pulse injection timing, allowing the circulating path to be shifted appropriately for each pulse. This dynamic control enables multi-turn injection despite the short pulse width by adapting the path shift timing to match each injection event.
Solution Approach 2:
The patent implements feedback control by synchronizing the laser pulse timing and bump magnet excitation timing with the synchrotron circulation period. The control unit monitors the circulation time and adjusts the injection timing and path shift timing to maintain proper synchronization, ensuring that each subsequent pulse is injected at the correct phase to follow the circulating beam.
3Quantity of substance
If multi-turn injection is performed by shifting the circulating path with a bump magnet, then additional ion beam injections can be made, but the injection timing must be precisely controlled to match the circulation time
Solution Approach 1:
The control unit performs multiple functions: it controls the laser pulse timing, synchronizes with the synchrotron circulation period, times the bump magnet excitation, and coordinates the injection sequence. This multi-functional control system manages the complex timing requirements through a single integrated unit, reducing overall system complexity while achieving precise multi-turn injection timing control.
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 allows for increased amplitude value of the circulating current and enhanced ion beam utilization efficiency, enabling more effective cancer therapy and physical experiments by synchronizing magnetic excitation with the laser ion source pulse timing.
Implementation Method 1
A laser ion source for extraction of an ion beam from the plasma generated therein by irradiation of a laser beam
Implementation Method 2
evaporating and ionizing the target element by means of the energy of the laser beam to generate plasma
Implementation Method 3
a linear accelerator for accelerating the particle beam extracted from the ion source
Implementation Method 4
a synchrotron for receiving the particle beam transported thereto from the linear accelerator and causing the particle beam to circulate in order to accelerate it
Implementation Method 5
a bump magnet for shifting the circulating path of the particle beam each time it makes a full turn
Data Source
AI summary
One embodiment of a particle accelerator includes: a particle source from which a particle beam is extracted with a beam pulse width of not greater than 2 μsec; a linear accelerator for accelerating the particle beam extracted from the particle source; a synchrotron for receiving the particle beam transported thereto from the linear accelerator and causing the particle beam to circulate in order to accelerate it until it gets to a predetermined energy level; a bump electromagnet for shifting the circulating path of the particle beam each time it makes a full turn; and a control unit for controlling the extent of magnetic excitation of the bump electromagnet and for controlling the timing of magnetic excitation of the bump electromagnet according to the pulse timing of the particle source.