Magnetic Deflector for PIXE Spectroscopy
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Solution Overview
Problem
The use of proton-induced X-ray emission (PIXE) spectroscopy is limited in detecting low energy X-rays from light elements due to the damage caused by backscattered protons, which requires an absorber that prevents these X-rays from reaching the detector, thereby preventing the quantification of elements lighter than aluminum.
Innovation Solution
A magnetic deflector is designed to deflect backscattered protons away from the detector, eliminating the need for an absorber and allowing low energy X-rays to be detected by creating a uniform magnetic field using parallel magnets surrounded by a ferromagnetic yoke, with nonmagnetic alignment spacers and an isolating spacer to secure and isolate the deflector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an absorber is used to prevent backscattered protons from damaging the detector, then the detector is protected from ion damage, but low energy X-rays from light elements cannot reach the detector
Solution Approach 1:
The patent replaces the mechanical absorber system with a magnetic field-based deflection system. Instead of using physical material to block protons, a magnetic field is applied to deflect backscattered protons away from the detector, eliminating the need for an absorber that would attenuate X-rays.
Solution Approach 2:
The magnetic field acts as an intermediary between the backscattered protons and the detector. Rather than protons directly damaging the detector or X-rays being blocked by an absorber, the magnetic field mediates by deflecting protons around the detector while allowing X-rays to pass through unchanged.
2Duration of action of stationary object
If an absorber is used to block backscattered protons, then the detector survives, but elements lighter than aluminum cannot be quantified
Solution Approach 1:
The patent substitutes the mechanical absorber approach with a magnetic field-based system that protects the detector without limiting the energy range of detectable X-rays. This enables detection of elements from aluminum down to lithium while maintaining detector protection.
Solution Approach 2:
The patent changes the protection mechanism from a static physical barrier (absorber thickness) to a dynamic magnetic field that can be adjusted. This parameter change allows the system to protect the detector while maintaining versatility across different element detection requirements.
3Measurement precision
If a magnetic field is used to deflect backscattered protons, then low energy X-rays can be detected, but the device complexity increases
Solution Approach 1:
The magnetic deflector is segmented into distinct functional components: magnet assemblies for generating the magnetic field, ferromagnetic yoke for field containment, alignment spacers for precise positioning, and entrance/exit apertures for beam control. This segmentation allows each component to be optimized independently while working together to achieve the desired functionality.
Solution Approach 2:
The magnetic deflector design serves multiple functions simultaneously: it deflects backscattered protons, allows transmitted protons to reach the detector, permits low energy X-rays to pass through, and provides structural support through the ferromagnetic yoke. This multi-functionality reduces the need for additional separate components.
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 solution enables the detection and quantification of low-Z elements by preventing ion damage to the detector, allowing X-rays over a wider energy range to be detected without compromising detection efficiency, making it suitable for biological and environmental applications.
Implementation Method 1
a direction of trajectory of an ion entering the magnetic deflector is altered by the magnetic field as it travels through the gap
Implementation Method 2
the first and second magnets establishing a magnetic field across the gap
Implementation Method 3
a ferromagnetic yoke surrounding the first and second magnets
Data Source
AI summary
Various examples are provided related to magnetic deflectors and their use in, e.g., proton-induced X-ray emission (PIXE) spectroscopy. In one example, a magnetic deflector includes first and second magnets separated by a gap; a ferromagnetic yoke surrounding the magnets, the yoke extending between a ferromagnetic front cover and rear cover, each including a canal extending through the cover; and a removable entrance aperture detachably attached to the front cover. The entrance aperture includes an opening aligned with the canal of the front cover to limit ions entering the magnetic deflector through the entrance aperture to a specified conical region. A direction of trajectory of an ion entering the magnetic deflector is altered by the magnetic field as it travels through the gap. The magnetic deflector can be used in a PIXE spectroscopy system to enable detection of low energy x-rays emitted from low-Z elements.