Electron Multiplier Gain Control Using Dynode Flux Feedback
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Solution Overview
Problem
Electron multipliers in particle detectors experience performance degradation over time, leading to gain instability and the need for frequent manual adjustments, which affects detector lifetime and system throughput.
Innovation Solution
A method and system for continuously and automatically adjusting the gain of electron multipliers by comparing electron fluxes at early and late stages of the electron multiplication chain, using electrical current measurements to maintain target gain through voltage bias adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual gain adjustment is performed periodically to compensate for electron multiplier ageing, then the required multiplier gain can be maintained, but system downtime increases and productivity decreases
Solution Approach 1:
The electron multiplier system performs self-diagnosis and self-adjustment by automatically monitoring electron flux at multiple dynodes and adjusting the voltage divider ratio to maintain optimal gain, eliminating the need for manual intervention and periodic shutdowns for calibration
Solution Approach 2:
The system implements continuous feedback by comparing electron flux measurements from multiple dynodes against expected values, and automatically adjusting operating parameters to correct gain drift caused by ageing, ensuring stable performance over extended periods
2Reliability
If operating voltage is increased to compensate for gain degradation, then the required multiplier gain can be maintained, but detector lifetime decreases
Solution Approach 1:
The system applies different voltages to different dynodes through a voltage divider network, allowing selective compensation of gain degradation at specific stages rather than uniformly increasing all voltages, thereby extending detector lifetime while maintaining overall gain stability
Solution Approach 2:
The system dynamically adjusts the voltage divider ratio and individual dynode voltages to compensate for ageing effects, optimizing the distribution of electrical stress across the multiplier stages to extend operational life while maintaining required gain performance
3Reliability
If manual gain adjustment is performed frequently to account for burn-in period effects, then initial gain loss can be compensated, but time and effort are consumed delaying instrument implementation
Solution Approach 1:
The system performs preliminary characterization during manufacturing to establish baseline performance parameters, enabling automatic compensation algorithms to be pre-configured and eliminating the need for extensive manual burn-in period adjustments after installation
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
Maintains electron multiplier gain at a stable level, reducing the need for manual adjustments and extending detector lifetime while improving system uptime and throughput.
Implementation Method 1
electron multipliers generally operate by way of secondary electron emission whereby the impact of a single or multiple particles on a first multiplier electron emissive surface thereby causing multiple secondary electrons associated with atoms of the impact surface to be released
Implementation Method 2
A voltage divider is typically implemented to distribute voltage between the dynodes. Each dynode is capable of emitting more than one electron, thereby forming a multiplication chain
Implementation Method 3
By this arrangement, an amplification chain is established with each step of chain providing a geometric increase in electron numbers. Toward the end the amplification chain, an avalanche of electrons is generated to form a highly amplified signal
Data Source
AI summary
A method for determining a performance parameter of an electron multiplier having a series of electron emissive surfaces forming electron multiplication chain, by comparing a first electron flux of a first electron emissive surface of the electron multiplication chain with a second electron flux of a second electron emissive surface of the electron multiplication chain, or of an electron collector of the electron multiplier. A method of operating an electron multiplier and an electron multiplier or an electron multiplication system is also described.