Asymmetric Scintillator Opening for Charged Particle Detection
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Solution Overview
Problem
Charged particle beam devices face inefficiencies and inhomogeneities in detecting secondary particles due to multiple photon deflections within the scintillator, particularly at the edge of the opening, which reduces the overall efficiency and spatial homogeneity of the detection process.
Innovation Solution
An asymmetrical scintillator design with an opening positioned off-center reduces the probability of multiple photon reflections by guiding photons directly into a light guide, enhancing efficiency and homogeneity through improved photon path alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a symmetrical scintillator design with a centered opening is used, then the device structure is simple and easy to manufacture, but multiple photon reflections occur between the outer edge and opening edge, reducing detection efficiency and spatial homogeneity
Solution Approach 1:
The patent applies asymmetry by positioning the opening off-center in the scintillator, specifically at a distance of 0.1-0.3 times the scintillator radius from the center. This asymmetric positioning eliminates the symmetry between the opening edge and outer edge, preventing multiple photon reflections while maintaining manufacturing feasibility through precise opening placement
2Device complexity
If a symmetrical scintillator design with a centered opening is used, then the device structure is simple, but spatial homogeneity of detection is reduced due to multiple photon reflections
Solution Approach 1:
The asymmetric opening position (0.1-0.3R from center) breaks the geometric symmetry that causes uniform reflection patterns, creating non-uniform photon path distributions that eliminate concentrated reflection zones and improve spatial homogeneity across the detection area
3Quantity of substance
If multiple photon reflections occur between the outer edge and opening edge, then photons may be lost through repeated deflections, but increasing scintillator size to accommodate reflections increases device complexity
Solution Approach 1:
The invention extracts or removes the problematic symmetric geometric relationship between the opening and outer edge by positioning the opening asymmetrically. This eliminates the reflection pathway that causes photon loss without requiring changes to scintillator material properties or adding complex optical 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
The asymmetrical scintillator design improves the detection efficiency and spatial homogeneity by minimizing photon reflections, ensuring that more photons are directed into the light guide and subsequently detected, thereby enhancing the overall performance of the charged particle beam device.
Implementation Method 1
The scintillator is suitable for receiving secondary particles and, in response, generating photons
Data Source
AI summary
An assembly for a detection unit for an optical device is described. The assembly includes a scintillator adapted to received secondary particles and, in response, generate photons, wherein the scintillator includes an opening for trespassing of a primary beam through the scintillator. The scintillator including the opening is asymmetrical with regard to one axis.