Electron Multiplier Coaxial Anode Connection for Ringing Suppression
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Solution Overview
Problem
Existing electron multipliers, such as photoelectron multipliers, face challenges in achieving fast response characteristics due to insufficient connection methods between capacitors and dynodes, leading to suboptimal ringing reduction and signal waveform sharpness.
Innovation Solution
The electron multiplier design incorporates a coaxial cable with an inner conductor, insulating material, and outer conductor, where the inner conductor is directly or indirectly fixed to the anode, and a capacitor is placed between the conductive member and the outer conductor, enhancing mechanical strength and suppressing ringing by positioning the coaxial cable components within the dynode unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lead wire is used to connect the capacitor to the dynode, then the capacitor can be housed in a sealed container, but the ringing reduction effect is insufficient
Solution Approach 1:
The patent merges the capacitor housing with the sealed container structure, eliminating the need for separate lead wire connections. The capacitor is integrated directly into the container wall, creating a unified structure that provides both housing and electrical connection functions, thereby achieving sufficient ringing reduction while simplifying the overall device complexity.
Solution Approach 2:
The patent introduces a conductive plate as an intermediary element that serves as one electrode of the capacitor. This conductive plate is directly connected to the dynode through the container wall structure, eliminating the need for separate lead wires and providing effective electrical connection while maintaining the sealed environment.
2Manufacturing precision
If a lead wire with smaller cross-sectional area than the signal line is used for connection, then the coaxial cable can be connected to the protrusion portion, but the output signal waveform sharpness is insufficient
Solution Approach 1:
The patent merges the signal line connection directly with the anode structure, eliminating intermediate lead wires with smaller cross-sectional areas. The inner conductor of the coaxial cable is directly connected to the anode through the container wall, maintaining signal integrity and waveform sharpness while simplifying the wiring structure.
3Device complexity
If the capacitor is constructed using the back surface of the final-stage dynode, then the capacitor structure is simplified, but the connection to adjacent dynode requires lead wire
Solution Approach 1:
The patent introduces a conductive plate as an intermediary element that replaces the need to use the dynode back surface directly. This conductive plate serves as one electrode of the capacitor and is integrated into the container wall, providing both structural support and electrical connection functions while eliminating the need for additional lead wires.
Data Source
AI summary
The present embodiment relates to an electron multiplier or the like having a structure for realizing fast response characteristics as compared with the related art, and the electron multiplier includes at least a dynode unit, a stem, a coaxial cable, a conductive member, and a capacitor. The dynode unit includes multiple-stage dynodes, an anode, and a pair of insulating support members. An end portion of an outer conductor is drawn into the dynode unit together with an exposed portion of an inner conductor constituting a part of one end portion of the coaxial cable. With this configuration, it is possible to arrange the capacitor in a space between the dynode unit and the stem, and it is possible to fix the exposed portion of the inner conductor to a portion of the anode interposed between the pair of insulating support members.