Scanning Electromagnet Voltage Control for Faster Beam Steering
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Solution Overview
Problem
Existing scanning electromagnets in particle beam therapy systems face issues with scanning speed due to counter electromotive forces generated by inductance of coils, leading to deviations in the scanning path and increased treatment time.
Innovation Solution
A scanning electromagnet control system that applies constant voltages when the charged particle beam direction is fixed and varying voltages when the direction changes, ensuring a larger potential difference between winding ends to maintain scanning speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If excitation current is changed when irradiation position is changed, then the charged particle beam can be deflected to new positions, but counter electromotive force generated by coil inductance decreases scanning speed and causes path deviation
Solution Approach 1:
The control unit calculates and applies the necessary voltage change in advance when the irradiation position is changed. By predicting the required voltage adjustment and applying it proactively, the system compensates for counter electromotive force before it significantly impacts scanning accuracy, thereby maintaining both high scanning speed and path precision
Solution Approach 2:
The control unit dynamically adjusts the voltage applied to the scanning electromagnet based on the changing irradiation position. By modifying the voltage parameter in response to position changes and ensuring the potential difference exceeds the counter electromotive force, the system maintains accurate beam deflection while enabling faster scanning transitions
2Reliability
If appropriate voltage is not applied to compensate for counter electromotive force, then the scanning electromagnet cannot maintain desired scanning path, but applying sufficient voltage increases the time taken to change irradiation position
Solution Approach 1:
The control unit dynamically adjusts the voltage parameter based on the irradiation position changes. By calculating the appropriate voltage that exceeds the counter electromotive force threshold, the system achieves accurate scanning paths without unnecessarily extending the time required for position transitions
Solution Approach 2:
The control unit monitors the irradiation position changes and adjusts the applied voltage accordingly. This feedback mechanism ensures that sufficient voltage is applied to overcome counter electromotive force and maintain scanning accuracy, while avoiding excessive voltage application that would prolong position transition times
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 faster scanning of charged particle beams, reducing treatment time and improving patient throughput.
Implementation Method 1
the irradiation nozzle is provided with a scanning electromagnet that generates a magnetic field in a direction crossing the charged particle beam
Implementation Method 2
by generating a magnetic field in a direction crossing the charged particle beam to deflect the charged particle beam
Implementation Method 3
a counter electromotive force caused by an inductance of a coil is generated
Data Source
AI summary
A scanning electromagnet deflects a charged particle beam by causing magnetic fields generated by a plurality of systems of windings, and whose terminating ends are connected to each other to act on the charged particle beam. A scanning electromagnet control system applies a constant voltage to each of starting ends of the windings, and of the scanning electromagnet when a direction of the charged particle beam is fixed, the constant voltage corresponding to the direction of the charged particle beam, and applies a varying voltage to each of the starting ends of the windings, and when the direction of the charged particle beam is changed, the varying voltage causing a potential difference between the starting ends of the windings, and to be larger than potential differences before and after the change of the direction.