Tunable Side-Bounce X-Ray Monochromator With Fixed Exit Angle
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Solution Overview
Problem
Current monochromators, particularly side-bounce monochromators, face limitations in being tunable across a broad range of radiation energies while maintaining a fixed exit angle, leading to high polarization-dependent losses and impractical reconfiguration requirements, which restrict their utility in research and industrial applications.
Innovation Solution
A tunable side-bounce monochromator system utilizing two diffraction elements that are rotatable about multiple axes to maintain a fixed exit angle, allowing for continuous tuning of radiation energies from 3 keV to 30 keV, reducing polarization-dependent losses and enabling compact, flexible beamline arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single crystal monochromator is used with a fixed output angle, then the monochromator structure is simple and stable, but the radiation energy range is limited and not tunable
Solution Approach 1:
The monochromator is divided into two separate diffraction elements (first and second diffraction gratings) instead of using a single crystal. Each element can be independently rotated about different axes, allowing the system to access a broader and tunable radiation energy range while maintaining structural stability through modular design.
Solution Approach 2:
The diffraction elements are made rotatable about multiple axes (the first about the input beam vector, the second about both the input beam vector and reflected beam vector). This dynamic capability allows continuous tuning of the radiation energy by changing the rotation angles, transforming a static fixed-energy system into a tunable one.
2Adaptability or versatility
If multiple diffraction elements with different grating periods are used, then multiple discrete radiation energies are accessible, but the energies are not continuously tunable and the device complexity increases
Solution Approach 1:
Instead of using multiple discrete diffraction elements with different fixed grating periods, the patent uses rotatable diffraction elements that can be dynamically adjusted. The rotation angles control the selected radiation energy continuously, eliminating the need to physically change diffraction elements and simplifying operation to mere angular adjustments.
Solution Approach 2:
The system changes the operational parameters (rotation angles of the diffraction elements) to achieve continuous tuning of radiation energy. By varying the angles of incidence and reflection through rotation, the monochromator can select any energy within a broad range without changing the physical structure or replacing components.
3Adaptability or versatility
If a tunable monochromator with variable output angle is implemented, then broad radiation energy range is achieved, but reconfiguration of radiation sources and targets is required
Solution Approach 1:
The monochromator is designed to maintain a constant output beam angle (fixed exit angle geometry) while tuning the radiation energy. This is achieved by coordinating the rotation of the two diffraction elements such that the output angle remains invariant. This equipotential approach to the output angle allows energy tuning without requiring reconfiguration of external radiation sources or targets.
Solution Approach 2:
The system uses dynamic rotation of diffraction elements to achieve energy tuning while maintaining a fixed output angle. The coordinated rotation allows the monochromator to adapt its internal configuration to select different energies without changing the external beam geometry, eliminating the need for reconfiguration of associated equipment.
4Adaptability or versatility
If conventional tunable monochromators are used, then radiation energy can be tuned, but polarization dependent losses are high
Solution Approach 1:
The rotatable diffraction elements allow dynamic adjustment of the diffraction geometry to optimize polarization performance. By controlling the rotation angles, the system can maintain favorable polarization conditions across the tuning range, reducing polarization-dependent losses compared to conventional fixed-geometry monochromators.
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
The system achieves continuous tunability of x-ray energies with reduced polarization losses, facilitating more efficient and versatile operation of beamlines, saving space, time, and resources, and enhancing the utility of side-bounce beamlines in various research and industrial settings.
Implementation Method 1
a first diffraction element configured to reflect, as a reflected beam, an input beam incident on a surface of the first diffraction element
Implementation Method 2
a second diffraction element configured to reflect, as an output beam having a beam exit angle, the reflected beam incident on a surface of the second diffraction element
Data Source
AI summary
Monochromators selectively transmit a narrow band of wavelengths of radiation from a broader band of wavelengths for use in a variety of applications and industries. Disclosed is a method and system for fixed-exit angle tunable monochromator. The system includes a first diffraction element configured to reflect an input beam incident on a surface of the first diffraction element. The input beam has an input beam vector and the first diffraction element is rotatable about the input beam vector. The system further includes a second diffraction element configured to reflect the beam as an output beam having a fixed beam exit angle. The beam is incident on a surface of the second diffraction element and the reflected beam has a reflected beam vector. The second diffraction element is rotatable about both the input beam vector and the reflected beam vector.