CEM Assembly Voltage Supply Circuit for DC Linearity
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Solution Overview
Problem
Channel electron multipliers (CEMs) with secondary electron emission layers on lead glass structural bodies require high resistance values to ensure stable operation, but low-resistance CEMs using atomic layer deposition on insulating materials face issues with resistance value fluctuations due to heat and voltage drops, leading to non-linear DC voltage control and increased manufacturing costs.
Innovation Solution
A CEM assembly with a single power source unit and a constant voltage generation unit, including resistors and potential fixing elements, is used to maintain a stable output potential by adjusting the voltage drop and ensuring a potential difference between terminals, thereby reducing the size and cost of the assembly while maintaining DC linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a low-resistance CEM is manufactured using atomic layer deposition on insulating materials, then manufacturing cost and device size are reduced, but resistance value fluctuates due to heat and voltage drops causing loss of DC linearity
Solution Approach 1:
The patent changes the resistance parameter of the multiplication channel from high resistance (10 MΩ or larger) to low resistance (less than 10 MΩ) by modifying the deposition method and structural body material. This allows manufacturing cost reduction while maintaining DC linearity through the voltage supply circuit design that compensates for the lower resistance effects.
2Ease of manufacture
If heat is generated in operation of low-resistance CEM, then manufacturing cost is reduced, but voltage drop occurs at output end causing increase in gain and loss of DC linearity
Solution Approach 1:
The patent implements a feedback mechanism through the voltage supply circuit that monitors and compensates for voltage drops at the output end. The circuit adjusts the applied voltage to maintain a constant potential difference between input and output electrodes, counteracting the effects of heat-generated resistance changes and ensuring stable output potential.
3Ease of manufacture
If resistance value of CEM is decreased, then device size and cost are reduced, but individual differences in resistance value between manufactured CEMs increase requiring consideration for fixing output potential
Solution Approach 1:
The patent designs a universal voltage supply circuit that can accommodate CEMs with varying resistance values within a specified range. The circuit performs multiple functions: applying voltage, compensating for resistance variations, and maintaining constant output potential, thereby simplifying the overall system despite individual differences in CEM resistance.
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 solution effectively fixes the output potential of the CEM, maintaining DC linearity even at higher output currents and reducing individual differences in resistance values, thus enhancing the operational stability and cost-effectiveness of the CEM assembly.
Implementation Method 1
a power source unit configured to apply a predetermined voltage between an input electrode and an output electrode
Implementation Method 2
If charged particles taken from the input end reach a secondary electron emission surface, secondary electrons are emitted from the secondary electron emission surface
Implementation Method 3
a constant voltage generation unit configured to hold a target potential for adjusting a potential of the output electrode
Data Source
AI summary
According to an embodiment, in a CEM assembly and the like, it is possible to reduce a size of a voltage supply circuit configured to stabilize a voltage to be applied to a channel electron multiplier. The CEM assembly includes a CEM and a voltage supply circuit. The CEM includes an input electrode, a multiplication channel, and an output electrode. The voltage supply circuit includes a power source unit and a constant voltage generation unit. A potential of an input electrode A is set by an electromotive force generated by the power source unit. The constant voltage generation unit includes a constant voltage supply unit configured to cause voltage drop. A target potential set at an output-side reference node is maintained by the voltage drop of the constant voltage supply unit.