FT-ELIT Detector Layout With MCP for Faster Ion Capture
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Solution Overview
Problem
Conventional electrostatic trap detectors are costly, cumbersome, and inefficient, with poor capture efficiency, low ion capacity, non-linear or asymmetrical extraction fields, slow rise times, and ions trapped within fringing fields, which hampers the development of mass spectrometry systems.
Innovation Solution
A Fourier Transform electrostatic linear ion trap (FT-ELIT) system with an electron multiplier detector, comprising a microchannel plate or channel electron multiplier, is implemented, where the electron multiplier detector is arranged within the image current detector's opening, allowing ions to be deflected and detected, and a focusing element is used between the detectors to optimize ion path and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrostatic trap detectors are used, then the system structure is established, but the capture efficiency is poor and ion capacity is low
Solution Approach 1:
The detector is segmented into multiple independent microchannel plates arranged in a specific geometric configuration (e.g., tetrahedral arrangement of four MCPs). Each MCP element independently detects ions from different spatial regions, improving overall capture efficiency while maintaining modular simplicity in the overall structure.
Solution Approach 2:
The invention transitions from conventional planar or linear detector arrangements to three-dimensional spatial configurations of microchannel plates. By positioning MCPs at multiple vertices of a geometric shape (e.g., tetrahedron), the detector captures ions from multiple angular directions simultaneously, dramatically increasing ion capacity and detection efficiency without proportionally increasing structural complexity.
2Speed
If conventional detectors are used, then the basic detection function is provided, but the rise time of extraction voltages is slow
Solution Approach 1:
The invention extracts and removes the complex multiple tank circuit architecture from the detector system. By using microchannel plates with direct electronic readout, the slow voltage rise time issue inherent in conventional electron multiplier detectors with complex RC circuits is eliminated, achieving fast response times without the burden of complex voltage generation circuitry.
Solution Approach 2:
The mechanical/electrical system of conventional electron multipliers with complex voltage division networks is replaced by the microchannel plate's inherent electron multiplication mechanism. The MCP's continuous electron cascade process naturally provides fast rise times without requiring complex external tank circuits, substituting a simpler physical mechanism for the complex electrical system.
3Measurement precision
If conventional detectors are used, then detection is achieved, but the extraction fields are highly non-linear or asymmetrical
Solution Approach 1:
The invention intentionally employs asymmetrical positioning of microchannel plates in specific geometric configurations (e.g., tetrahedral arrangement with plates at vertices). This controlled asymmetry, when combined with appropriate voltage application to each plate, creates symmetrical and linear extraction fields in the central detection region, improving measurement precision while maintaining relatively simple field configuration.
Solution Approach 2:
The microchannel plate detector system serves multiple functions: it provides detection, defines extraction field geometry, and enables precise mass analysis simultaneously. The geometric arrangement of MCPs universally creates well-defined electric field patterns that are both simple to configure and highly precise for measurement, achieving multi-functionality that resolves the contradiction between field linearity and configuration complexity.
4Reliability
If conventional detectors are used, then ion detection is performed, but ions are trapped within fringing fields
Solution Approach 1:
The detector is segmented into multiple spatially separated microchannel plates arranged in a geometric configuration (e.g., tetrahedral arrangement). This segmentation creates distinct detection zones for each plate, allowing ions to be detected in well-defined regions while minimizing the overlap and trapping effects of fringing fields between detector elements, thereby improving detection accuracy without complex field shielding.
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 enhances the sensitivity and speed of mass spectrometry by allowing for automatic gain control, increased detector lifetime, and improved linear dynamic range, while minimizing peak width and enabling further ion optics or fragmentation sources post-trap.
Implementation Method 1
an electron multiplier detector arranged in an opening of the image current detector, the electron multiplier detector being operable to receive ions deflected from the central axis
Implementation Method 2
an electrostatic linear ion trap (ELIT) comprising a central axis along which ions travel
Data Source
Figure 1
Figure 2
Figure 3A~3D
AI summary
A Fourier Transform electrostatic linear ion trap (ELIT) is disclosed with an electron multiplier detector comprising one of a microchannel plate and a channel electron multiplier. An (ELIT) is provided comprising a central axis along which ions travel; an image current detector disposed at least partially around the central axis of the ELIT; and an electron multiplier detector arranged in an opening of the image current detector, the electron multiplier detector being operable to receive ions deflected from the central axis. The electron multiplier detector may have a front surface that is perpendicular to the central axis of the ELIT. The electron multiplier detector may comprise two separate elements at non-normal angles to the central axis of the ELIT. The image current detector may comprise a cylinder with the opening on one side in which the electron multiplier detector is arranged, a U-shape, or a half-tube detector.