Ion-to-Electron Converter for Charged Particle Detection
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Solution Overview
Problem
Conventional particle detectors fail to effectively detect negative ions, as they pass through without interaction, leading to shortened scintillator element life and reduced detection sensitivity for all charged particles.
Innovation Solution
A charged particle detection system that utilizes an ion-to-electron converter to convert both positive and negative ions into electrons, amplifying the number of electrons detected, and employs a grid and electric field configuration to selectively direct and detect electrons, positive ions, and negative ions in three distinct modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional particle detectors are used with ion-to-electron converters designed to allow positive ion interaction while preventing negative ion interaction, then positive ion detection is improved, but negative ions pass through without interaction leading to shortened scintillator element life and reduced detection sensitivity
Solution Approach 1:
The patent inverts the conventional approach by designing the ion-to-electron converter to interact with negative ions while allowing positive ions to bypass it. This is achieved by reversing the charge polarity of the converter surfaces, so that negative ions are converted to electrons at the converter while positive ions pass through to interact directly with the scintillator element, thereby extending scintillator life while maintaining detection sensitivity for both ion types
Solution Approach 2:
The detection system is designed to universally detect both positive and negative ions through a dual-path configuration. The ion-to-electron converter handles negative ion detection while allowing positive ions to pass through, and the scintillator element simultaneously detects both electron-generated light and direct positive ion interactions, creating a multi-functional detection system that extends component life while maintaining broad detection capability
2Device complexity
If conventional particle detectors allow negative ions to pass through without interaction, then the detector structure remains simple, but detection sensitivity for negative ions is lost and scintillator element life is shortened
Solution Approach 1:
The detection system is segmented into two functional paths: a first ion-to-electron converter dedicated to negative ion detection that converts negative ions to electrons, and a second scintillator element that detects both electron-generated light and direct positive ion interactions. This segmentation allows each component to specialize in specific particle types, improving overall detection sensitivity while maintaining reasonable structural complexity
Solution Approach 2:
The ion-to-electron converter acts as an intermediary component that mediates negative ion detection by converting negative ions to electrons before they reach the scintillator element. This intermediary function protects the scintillator from direct negative ion damage while enabling sensitive detection through the conversion process, and the system maintains simplicity by using this single intermediary rather than multiple complex subsystems
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
Enhances detection sensitivity and extends the life of the scintillator element by allowing interaction with negative ions, improving the detection of all charged particles through amplification and selective electric field manipulation.
Implementation Method 1
ion-to-electron converter to convert both positive and negative ions into electrons
Implementation Method 2
a scintillator element, which is excited by electrons that are emitted from the sample
Implementation Method 3
a photomultiplier for receiving the light
Implementation Method 4
an electrical biasing assembly configured and operable for creating an appropriate electric field within the detection device to thereby define trajectories for charged particle propagation
Data Source
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AI summary
A charged particle detection device comprising an electric field generator configured and operable to create an electric field defining trajectories for charged particles of different types emitted from a sample as a result of the sample interaction with a particle beam, the emitted charged particles of different types being one of the following: electrons, positive ions and negative ions, an ion-to-electron converter having a conversion surface including a continuous interaction region oriented so as to intersect the trajectories of the charged particles of different types propagating from the sample, the conversion surface operative to emit electrons in response to the surface interaction with the charged particles of the different types, and an electron detector configured and operable to receive electrons from the converter and generate output data indicative thereof.