Microstructured X-ray Targets for Heat Dissipation and Brightness
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Solution Overview
Problem
Current x-ray sources face limitations in achieving high brightness while maintaining a compact, laboratory-friendly size, as they struggle with heat management and efficiency in generating high-intensity x-rays, leading to suboptimal signal-to-noise ratios in imaging and diagnostic applications.
Innovation Solution
The development of novel x-ray sources with microstructured targets made of x-ray generating materials embedded in substrates with high thermal conductivity, allowing for efficient heat dissipation and the use of on-axis collection angles to enhance x-ray brightness, along with additional cooling systems and rotating anodes with microstructured patterns to manage heat and increase brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional x-ray sources use solid targets with electron bombardment, then x-rays are generated, but heat management becomes difficult and brightness is limited
Solution Approach 1:
The target is divided into multiple discrete microstructures (pillars, rods, or wires) arranged in an array. Each microstructure acts as an independent x-ray generation element with its own heat dissipation path to the substrate, preventing heat accumulation and enabling higher electron beam currents without target damage.
Solution Approach 2:
The microstructures are made of high-Z materials (tungsten, molybdenum, gold) optimized for x-ray generation, while the substrate is made of high thermal conductivity materials (diamond, copper, aluminum) optimized for heat dissipation. This local material optimization allows simultaneous high brightness and effective heat management.
2Illumination intensity
If synchrotron or free electron laser systems are used to generate intense x-ray beams, then very intense x-rays are produced, but the systems become physically very large requiring large buildings and acres of land
Solution Approach 1:
The invention transitions from the conventional planar target geometry to a three-dimensional microstructured array. This vertical dimensionality allows multiple x-ray generation sites to be stacked within a compact volume, achieving high intensity output from a small footprint device that fits on a laboratory bench.
3Illumination intensity
If microstructured targets with high thermal conductivity substrates are used, then heat dissipation is improved and x-ray brightness increases, but device complexity increases
Solution Approach 1:
The microstructures are engineered with specific geometric parameters (height, width, spacing, aspect ratio) that optimize both heat dissipation efficiency and x-ray generation. By carefully controlling these parameters, the design achieves high brightness while maintaining manufacturability through standard microfabrication techniques.
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
These approaches result in x-ray sources that are several orders of magnitude brighter than existing commercial technologies, enabling improved signal-to-noise ratios and better performance in scientific and diagnostic applications, while remaining compact and suitable for laboratory or portable use.
Implementation Method 1
microstructured targets made of x-ray generating materials embedded in substrates with high thermal conductivity, allowing for efficient heat dissipation
Implementation Method 2
Röntgen was experimenting with electron bombardment of targets in vacuum tubes. These high energy, short wavelength photons are now routinely used
Implementation Method 3
rotating anodes with microstructured patterns to manage heat and increase 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 by aligning discrete x-ray sub-sources, or 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 in turn allows bombardment of the x-ray generating material with higher electron density and/or higher energy electrons, leading to greater x-ray brightness.Some embodiments of the invention comprise x-ray optical elements placed between sub-sources of x-rays. These x-ray optical elements may form images of one or more x-ray sub-sources in alignment with other x-ray sub-sources, and may enhance the linear accumulation that can be achieved.