X-ray Tube Anode Thermal Expansion Compensation
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Solution Overview
Problem
Conventional X-ray tube anodes experience thermal expansion due to heating, leading to misalignment and de-focusing of X-ray optics, which is problematic in applications requiring precise alignment and stable X-ray flux, as existing compensation methods are either impractical, complex, or reduce the longevity of the X-ray tube.
Innovation Solution
The anode is designed with a specific shape that aligns thermal expansion direction with the anode surface, ensuring the focal spot location remains unchanged from the initial to the operating state, thereby minimizing or eliminating beam spot movement through careful configuration of the anode geometry and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anode designs are used, then the X-ray tube can operate, but thermal expansion causes beam spot movement leading to misalignment and de-focusing of X-ray optics
Solution Approach 1:
The anode surface is configured with a specific curvature radius that changes the geometric parameters of the anode to compensate for thermal expansion effects. By carefully selecting the curvature radius, the beam spot position remains stable despite temperature-induced dimensional changes in the anode structure.
Solution Approach 2:
The invention directly addresses thermal expansion by designing the anode surface geometry to counteract the effects of thermal expansion. The curved surface configuration ensures that as the anode expands due to heating from the electron beam, the beam spot position on the anode surface remains substantially unchanged, eliminating misalignment issues.
2Reliability
If passive compensation methods using exotic materials are used, then beam spot movement can be reduced, but the cost and complexity of the system increases
Solution Approach 1:
Instead of using exotic materials with special thermal properties, the invention changes the geometric parameters of the anode surface (curvature radius) to achieve beam spot stability. This approach uses conventional materials in a novel geometric configuration, avoiding the need for expensive or difficult-to-obtain materials.
Solution Approach 2:
The invention replaces expensive exotic materials with conventional, easily manufacturable anode structures. The curved surface can be created using standard manufacturing techniques, making the solution more cost-effective and accessible than passive compensation methods requiring special materials.
3Reliability
If active compensation methods with actuators are used, then beam spot position can be maintained, but the system becomes more complex and longevity is reduced
Solution Approach 1:
The invention removes the need for active compensation systems, actuators, and complex control mechanisms by incorporating beam spot stability directly into the anode surface geometry. This passive geometric solution eliminates moving parts that would otherwise require maintenance and reduce tube longevity.
Solution Approach 2:
The curved anode surface configuration provides self-compensation for thermal expansion effects. The geometry itself ensures beam spot stability without requiring external actuators or control systems, making the system more reliable and extending its operational life by eliminating additional failure points.
4Ease of operation
If the anode surface is configured with appropriate curvature, then beam spot position remains stable during thermal expansion, but manufacturing precision requirements increase
Solution Approach 1:
The invention specifies a curvature radius that balances manufacturing feasibility with beam spot stability. By selecting an appropriate curvature radius, the design achieves thermal compensation while remaining manufacturable with standard precision techniques, avoiding excessively tight tolerances that would be difficult or expensive to achieve.
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 significantly reduces beam spot displacement, achieving alignment precision comparable to or exceeding conventional active and passive techniques without the need for exotic materials, actuators, or complex control systems, thus extending X-ray tube longevity and simplifying construction.
Implementation Method 1
the anode is heated by the electron beam from a first state to a predetermined second state and undergoes resulting thermal expansion causing a change in the location of the focal spot on the surface of the anode
Implementation Method 2
an electron beam impinges upon the anode at a focal spot on the surface of the anode
Implementation Method 3
the anode is heated by the electron beam from a first state to a predetermined second state
Data Source
AI summary
An anode for an X-ray tube is provided. The anode has a shape configured such that, in use: an electron beam impinges upon the anode at a focal spot on the surface of the anode, and the anode is heated by the electron beam from a first state to a predetermined second state and undergoes resulting thermal expansion causing a change in the location of the focal spot on the surface of the anode, wherein the configured shape of the anode is such that the spatial position of the focal spot with respect to the X-ray tube is substantially the same for the first state and the second state. A method of producing an anode for an X-ray tube is also provided.