Charged Particle Beam Scanning Stability via Minimum Current Control
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Solution Overview
Problem
The accuracy of charged particle beam scanning in treatment apparatuses is affected by instability near regions where the electric current flowing through the scanning electromagnet is close to zero, leading to unstable irradiation positions.
Innovation Solution
By adjusting the electric current through the scanning electromagnet to maintain a predetermined magnitude, the charged particle beam can be emitted and scanned along the base axis, avoiding regions of zero current, thus stabilizing the scanning process. Additionally, the inclination of the charged particle beam can be adjusted using a transporter or bending electromagnet to ensure accurate and stable scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the scanning electromagnet operates with electric current close to zero, then the device complexity is reduced, but the scanning stability and irradiation position accuracy deteriorate
Solution Approach 1:
The patent changes the operating parameters of the scanning electromagnet by setting a predetermined minimum current value that prevents the current from reaching zero. This parameter modification ensures the beam remains stable while avoiding the region where current approaches zero, thus resolving the contradiction between simplified operation and scanning stability.
2Reliability
If the scanning electromagnet uses high current to improve scanning stability, then the reliability improves, but the power consumption and response speed deteriorate
Solution Approach 1:
The patent optimizes the current parameter by establishing a predetermined minimum value rather than using high current. This parameter change achieves scanning stability without excessive power consumption, as the current is maintained above zero but not necessarily at high levels, thus resolving the contradiction between reliability and energy consumption.
Solution Approach 2:
The control device monitors the electric current flowing through the scanning electromagnet and adjusts it to maintain the predetermined minimum current value. This feedback mechanism ensures stable scanning while optimizing power consumption, preventing both zero-current instability and excessive current usage.
3Weight of moving object
If the bending electromagnet is shortened to downsize the rotating gantry, then the weight and volume are reduced, but the beam trajectory control precision may deteriorate
Solution Approach 1:
The patent changes the operational parameters of the scanning electromagnet to compensate for the shortened bending electromagnet. By adjusting the current characteristics and scanning parameters, the system maintains beam trajectory control precision despite the reduced physical length of the bending electromagnet, thus resolving the contradiction between downsizing and precision.
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 stabilizes the scanning of the charged particle beam, improving the accuracy of irradiation positions and allowing for downsizing of the rotating gantry by shortening heavy components like the bending electromagnet, while also reducing power source costs and enhancing response speed.
Implementation Method 1
a scanning electromagnet that performs scanning with the charged particle beam
Implementation Method 2
is rotatable around the irradiation target by a rotating gantry
Data Source
AI summary
A charged particle beam treatment apparatus includes an irradiator that irradiates an irradiation target with a charged particle beam by a scanning method, in which the irradiator includes a scanning electromagnet that performs scanning with the charged particle beam, is rotatable around the irradiation target by a rotating gantry, and emits the charged particle beam with a base axis orthogonal to a center line of the rotating gantry and passing through the center line as a reference, and when the scanning electromagnet is not operated, the charged particle beam which is emitted from a tip portion of the irradiator is inclined in one direction with respect to the base axis.