Electron Multiplier Baffles for Ion Feedback Reduction
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Solution Overview
Problem
Electron multiplier performance degrades over time due to reduced secondary electron emission and ion feedback, leading to decreased gain and shortened service life, with existing solutions providing only modest improvements and limited effectiveness in reducing ion feedback.
Innovation Solution
The electron multiplier is configured with baffles to inhibit contaminants from entering or passing through, reducing vacuum conductance and minimizing ion feedback by creating a non-linear or tortuous path for gas flow, thereby protecting the electron emissive surfaces and extending the device's operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electron multiplier operates for extended periods, then productivity is improved, but the gain decreases due to secondary electron emission reduction and ion feedback
Solution Approach 1:
The patent extracts and removes ions from the electron multiplication region by providing a ion removal means (such as ion pumping or ion trapping mechanisms) that actively eliminates ions before they can cause feedback and degrade detector performance, thereby extending operational lifetime while maintaining gain
Solution Approach 2:
The patent introduces an intermediary component (ion removal means) between the electron multiplier and the environment that mediates the interaction by capturing and removing ions, preventing them from causing harmful feedback effects while allowing the electron multiplication process to continue
2Reliability
If the operating voltage is increased to compensate for gain loss, then the gain is maintained, but the service life is shortened
Solution Approach 1:
The patent applies preliminary action by proactively removing ions from the system before they can accumulate and cause feedback that would necessitate voltage increases, thereby extending service life while maintaining gain through preventive ion management rather than reactive voltage adjustment
3Ease of operation
If the electron multiplier is made more open to the environment, then ease of operation is improved, but ion feedback increases
Solution Approach 1:
The patent introduces an intermediary ion removal mechanism that allows the electron multiplier to remain accessible while actively managing the ion population, serving as a mediator between the open configuration and the harmful ion feedback effects
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 configuration significantly reduces ion feedback and extends the service life of the electron multiplier by maintaining the responsiveness of electron emissive surfaces and improving detector performance by minimizing the impact of contaminants, leading to enhanced sensitivity and reduced noise.
Implementation Method 1
Electron multipliers generally operate by way of secondary electron emission whereby the impact of a single or multiple particles on the multiplier impact surface causes single or (preferably) multiple electrons associated with atoms of the impact surface to be released
Implementation Method 2
decrease vacuum conductance of the electron multiplier compared to the same or similar electron multiplier not having the one or more baffles
Data Source
AI summary
An electron multiplier apparatus of the type used in ion detectors, and modifications thereto for extending the operational lifetime or otherwise improving performance. The electron multiplier includes a series of discrete electron emissive surfaces configured to provide an electron amplification chain, the electron multiplier being configured so as to inhibit or prevent a contaminant from entering into, or passing partially through, or passing completely through the electron multiplier. The electron multiplier may include one or more baffles configured so as to decrease vacuum conductance of the electron multiplier compared to the same or similar electron multiplier not having one or more baffles.