Microstructured X-ray Targets for High Brightness Generation
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Solution Overview
Problem
Existing x-ray sources face limitations in achieving high brightness, particularly when coupled with x-ray optical systems that collect x-rays in a limited angular range, due to heat management issues and material attenuation, leading to constraints on electron current density and x-ray production.
Innovation Solution
The development of x-ray sources with microstructured targets embedded in high thermal conductivity substrates, allowing for efficient heat dissipation and higher electron power density, combined with novel configurations that enable zero-degree take-off angles for x-ray accumulation and additional cooling systems to enhance x-ray brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional x-ray sources are used, then x-ray generation is achieved, but brightness is limited due to heat management issues and material attenuation
Solution Approach 1:
The target is divided into multiple discrete microstructures (e.g., microcolumns, microcubes) arranged in an array, each independently generating x-rays. This segmentation allows heat to be distributed across multiple discrete heat sinks rather than concentrated in a single bulk target, enabling higher total power handling while maintaining high brightness through linear accumulation of x-rays from multiple sources
Solution Approach 2:
A high thermal conductivity substrate material (such as diamond, graphite, or copper) is introduced as an intermediary between the microstructured target elements and the heat sink. This intermediary efficiently conducts heat away from the electron bombardment zones while allowing the microstructures to maintain optimal operating temperatures for high brightness x-ray generation
2Illumination intensity
If electron current density is increased to improve x-ray production, then x-ray brightness increases, but heat management becomes problematic
Solution Approach 1:
The target is divided into multiple discrete microstructures (e.g., microcolumns, microcubes) arranged in an array, each independently generating x-rays. This segmentation allows heat to be distributed across multiple discrete heat sinks rather than concentrated in a single bulk target, enabling higher total power handling while maintaining high brightness through linear accumulation of x-rays from multiple sources
Solution Approach 2:
The microstructured target elements are designed with specific local properties (small cross-sectional area, high aspect ratio) that optimize both x-ray generation efficiency and heat dissipation. Each microstructure has a small electron interaction volume that maximizes x-ray brightness while the high surface-area-to-volume ratio enhances heat transfer to the substrate
3Device complexity
If x-ray optical systems with limited angular collection are used, then system complexity is reduced, but x-ray brightness is limited
Solution Approach 1:
Multiple discrete x-ray generating microstructures are combined in a linear array configuration, and their x-ray emissions are accumulated in a specific direction (zero-degree take-off angle). This merging of emissions from multiple sources creates a high brightness source that works effectively with simple optical systems having limited angular collection, as the linear accumulation naturally directs x-rays along the array axis
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 results in x-ray sources that are several orders of magnitude brighter than commercial technologies, achieving higher x-ray brightness while maintaining a compact form suitable for laboratory or table-top environments.
Implementation Method 1
microstructured targets embedded in high thermal conductivity substrates, allowing for efficient heat dissipation
Implementation Method 2
The electrons 111 accelerate towards the target 100 and collide with it at high energy, with the energy of the electrons determined by the magnitude of the accelerating voltage. The collision of the electrons 111 into the target 100 induces several effects, including the generation of x-rays 888
Implementation Method 3
additional cooling systems to enhance x-ray brightness
Data Source
AI summary
A compact source for high brightness x-ray generation is disclosed. The higher brightness is achieved through electron beam bombardment of multiple regions aligned with each other to achieve a linear accumulation of x-rays. This may be achieved through the use of x-ray targets that comprise microstructures of x-ray generating materials fabricated in close thermal contact with a substrate with high thermal conductivity. This allows heat to be more efficiently drawn out of the x-ray generating material, and allows bombardment of the x-ray generating material with higher electron density and/or higher energy electrons, leading to greater x-ray brightness. The orientation of the microstructures allows the use of a take-off angle at or near 0°, allowing the accumulation of x-rays from several microstructures to be aligned and be used to form a beam in the shape of an annular cone.