Charged Particle Beam Deflector for Uniform Heat Distribution
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Solution Overview
Problem
Existing irradiation techniques for charged particles result in uneven heat distribution on targets, leading to potential thermal stress and limitations in increasing beam current due to localized high heat loads.
Innovation Solution
An irradiation control device that adjusts the diameter and path of the charged particle beam to form multiple heat density peaks between the center and edge of the target, using a deflector and controller to ensure uniform heat distribution by altering the beam's diameter, movement speed, and number of irradiations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the beam diameter is increased to irradiate a larger target area, then the coverage area is improved, but the heat density becomes uneven with localized high heat loads
Solution Approach 1:
The beam irradiation is divided into multiple segments by creating multiple peaks of heat density across the target surface. Instead of using a single large beam, the system creates several smaller beam positions that collectively cover the entire target area, with each position contributing to a controlled heat density peak. This segmentation approach ensures uniform heat distribution while maintaining comprehensive coverage.
Solution Approach 2:
The beam position is made dynamic by moving it across multiple locations on the target surface. The controller adjusts the deflector to move the beam between different positions, creating a time-varying irradiation pattern. This dynamic movement allows the system to distribute heat uniformly across the entire target area while preventing localized overheating.
2Productivity
If the beam current is increased to improve neutron generation efficiency, then the productivity is improved, but the thermal stress on the target increases
Solution Approach 1:
The total beam current is segmented across multiple irradiation positions rather than concentrating it at one location. By distributing the beam current through multiple peaks of heat density, the system maintains high overall productivity for neutron generation while preventing excessive thermal stress at any single point on the target.
Solution Approach 2:
The beam irradiation follows a periodic pattern by moving between multiple positions on the target surface. This periodic movement allows the target material to cool between irradiation cycles at each position, reducing cumulative thermal stress while maintaining high average beam current for efficient neutron generation.
3Use of energy by moving object
If the beam is focused to a small diameter to increase heat density, then the energy concentration is improved, but the irradiation coverage area is reduced
Solution Approach 1:
The system transitions from a single-point energy concentration approach to a multi-dimensional coverage strategy. By distributing multiple focused beam positions across the target surface in different locations, the system maintains high energy concentration at each position while achieving comprehensive area coverage through the collective contribution of all beam positions.
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
Achieves a more uniform heat density distribution across the target, preventing thermal stress and allowing for increased beam current while maintaining target integrity, enabling efficient neutron generation and reduced irradiation time in therapies like BNCT.
Implementation Method 1
a deflector that deflects the charged particles
Implementation Method 2
a beam of charged particles is moved on an irradiation surface of a target to form a plurality of peaks of heat density formed by the beam
Data Source
AI summary
An irradiation control device which controls irradiation of charged particles to a target that includes a substance that generates neutrons by being irradiated with a charged particle beam, includes: a deflector that deflects the charged particles; and a controller that controls the deflector such that a plurality of peaks of heat density formed by the beam are formed between a center of an irradiation surface of the target and an end portion of the irradiation surface by moving the beam of the charged particles on the irradiation surface.