Microchannel Plate Mount Assembly With Floating Clamps
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Solution Overview
Problem
Ion detectors in mass spectrometry face challenges due to sensitivity to configuration changes and deformations, leading to inaccuracies in ion detection and erosion from electric discharge, which affect the flatness and functionality of microchannel plates.
Innovation Solution
A mount assembly for microchannel plates in ion detectors, comprising input and output clamping plates with staggered pads and a biasing element, maintains or improves flatness, reduces erosion, and increases tolerance to stress and temperature changes by allowing floating movements, while ensuring unobstructed microchannels and electrical potential differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the microchannel plate is held rigidly between clamping plates, then the plate is securely positioned, but the plate becomes sensitive to stress and deformation from configuration changes
Solution Approach 1:
The mount assembly incorporates floating clamping plates that can move dynamically to accommodate thermal expansion and configuration changes. The input and output clamping plates are not rigidly fixed but can float to maintain optimal contact with the microchannel plate, preventing stress buildup while ensuring secure positioning.
Solution Approach 2:
The design allows for parameter changes in the mounting structure to accommodate environmental variations. The clamping plates can adjust their position and pressure applied to the microchannel plate, maintaining flatness despite temperature changes or mechanical stress from the mass spectrometer operation.
2Reliability
If pads are positioned to maximize contact with the microchannel plate, then the plate is securely held, but microchannels may become obstructed
Solution Approach 1:
The input and output pads are positioned asymmetrically relative to each other on the clamping plates. This asymmetric arrangement ensures that when pads contact the microchannel plate for secure holding, they do not simultaneously obstruct opposing microchannel openings, as each pad's position is deliberately offset from its counterpart.
3Shape
If the clamping structure is rigid to maintain flatness, then the microchannel plate remains flat, but erosion from electric discharge increases
Solution Approach 1:
The floating clamping plate design provides a cushioning effect that absorbs and distributes electric discharge energy before it can cause significant erosion to the microchannel plate. The flexible mounting structure acts as a protective buffer, maintaining flatness while reducing the harmful effects of electrical erosion.
4Reliability
If the mount assembly is fixed to prevent movement, then positioning is stable, but tolerance to temperature changes and stress decreases
Solution Approach 1:
The mount assembly transitions from a fixed rigid structure to a dynamic floating structure. The input and output clamping plates can move independently to accommodate thermal expansion and mechanical stress, maintaining positioning stability while adapting to environmental changes in the mass spectrometer operating conditions.
Data Source
AI summary
A mount assembly for holding a microchannel plate in an ion detector includes an input side clamping plate including a plurality of input side pads; and an output side clamping plate including a plurality of output side pads, wherein, when assembled, the input side clamping plate and the output side clamping plate are configured to allow positioning between the input side clamping plate and the output side clamping plate the microchannel plate having a plurality of microchannels each having an input side opening and an opposed output side opening; hold the microchannel plate; and position the subset of the input side pads and the subset of the output side pads in a staggered configuration such that when a microchannel of a plurality of microchannels is obstructed in a first opening, a second opening of the microchannel opposing the first opening is unobstructed.