Single Linac Cargo Inspection via Magnetic Beam Steering
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Solution Overview
Problem
Existing cargo inspection systems face challenges in accurately identifying high-Z materials within cargo containers due to instability in dual energy X-ray systems and the need for separate and cumbersome neutron generators, which are expensive and time-consuming to operate.
Innovation Solution
A system that uses a single linear accelerator to interleave X-rays and neutrons, allowing for precise and efficient inspection without mechanical movement, by selectively directing an electron beam between an X-ray target and a neutron target using a magnet, enabling rapid switching between X-ray and neutron generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dual energy linear accelerator is used to identify high-Z materials, then material discrimination capability is improved, but system stability deteriorates due to frequency and power jitter causing beam energy instability
Solution Approach 1:
The system dynamically switches between two operational modes: X-ray generation mode and neutron generation mode. The linear accelerator operates at full energy for neutron production, while X-rays are generated at lower energies through a converter, avoiding the instability issues of dual-energy X-ray operation while maintaining material discrimination capability through complementary X-ray and neutron detection
Solution Approach 2:
An X-ray converter is introduced as an intermediary component. The linear accelerator generates high-energy electrons that strike the converter to produce X-rays, while a separate neutron converter produces neutrons. This intermediary approach allows the system to generate both X-rays and neutrons from a single accelerator without requiring unstable dual-energy X-ray operation
2Measurement precision
If separate neutron generators are used for high-Z material inspection, then detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The linear accelerator is designed to perform multiple functions: it can generate high-energy electron beams for direct neutron production, and it can also generate X-rays through an X-ray converter. This multi-functional approach eliminates the need for separate neutron generators and X-ray systems, reducing overall system complexity while maintaining both detection capabilities
Solution Approach 2:
The system merges the functions of X-ray generation and neutron generation into a single linear accelerator platform. By combining the electron beam source, converters, and detection systems into one integrated apparatus, the system achieves high-Z material detection capability without requiring multiple separate generators, thereby reducing device complexity and operational cost
3Adaptability or versatility
If mechanical movement is used to switch between X-ray and neutron targets, then target selection is achieved, but inspection time increases
Solution Approach 1:
The system replaces mechanical target selection with magnetic field-based electron beam steering. Electromagnets deflect the electron beam to direct it toward either the X-ray converter or the neutron converter without any mechanical movement of targets or components. This substitution eliminates the time required for mechanical positioning while maintaining the ability to switch between X-ray and neutron generation modes
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 provides enhanced precision and efficiency in identifying materials within cargo containers, reducing costs and time compared to traditional systems, while eliminating the need for separate neutron sources and mechanical movement.
Implementation Method 1
a linear accelerator configured to generate first and second electron beams respectively having first and second energies
Implementation Method 2
a magnet configured to control irradiation of the first and second targets by the first and second electron beams
Implementation Method 3
cause the magnet to direct the first electron beam to the first target so as to generate a first X-ray beam that has a first X-ray energy and irradiates the object
Implementation Method 4
cause the magnet to direct the second electron beam to the second target so as to generate a neutron beam that irradiates the object
Data Source
AI summary
Systems and methods for generating X-rays and neutrons using a single linear accelerator are disclosed. Such system and methods may interrogate an object at times with X-rays and at other times with neutrons, e.g., after suspicious material is detected based on the X-rays. A system may include a single linear accelerator for generating first and second electron beams; first and second targets; a magnet configured to control irradiation of the first and second targets by the first and second electron beams; and a controller that (a) causes the linear accelerator to generate the first electron beam and causes the magnet to direct the beam to first target to generate X-rays; and (b) causes the linear accelerator to generate the second electron beam and causes the magnet to direct the beam to the second target to generate neutrons.