RF Component Cross-Talk Reduction in Mass Spectrometers
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Solution Overview
Problem
Mass spectrometers experience performance degradation due to RF cross-talk between adjacent RF components, leading to reduced mass resolution and sensitivity, which existing solutions like electrostatic lenses or axial extensions either complicate optimization or require additional fabrication efforts.
Innovation Solution
A conductive electric field screen is positioned at the radial outer periphery of one RF component, aligned end-to-end with another, to reduce RF electric field cross-talk without affecting geometrical acceptance or creating electric field distortions, using a design that can be grounded or supplied with tunable RF and DC voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electrostatic lenses are placed between adjacent RF components to reduce cross-talk, then RF coupling is reduced, but geometrical acceptance is reduced and optimization complexity increases
Solution Approach 1:
A conductive screen is introduced as an intermediary element between the first and second RF components. The screen is positioned at the radial outer periphery of the first RF component and faces the second RF component, acting as a mediator to block RF electric field cross-talk without interfering with ion transmission through the geometrical acceptance path.
Solution Approach 2:
The conductive screen is positioned in the radial dimension at the outer periphery of the first RF component, rather than in the axial path of ion transmission. This dimensional placement allows the screen to block RF fields in the radial direction while leaving the axial ion transmission path unchanged, thus avoiding impact on geometrical acceptance.
2Object-affected harmful factors
If electrostatic lenses are placed between adjacent RF components to reduce cross-talk, then RF coupling is reduced, but ion transmission is reduced
Solution Approach 1:
The conductive screen is positioned in the radial dimension at the outer periphery of the first RF component, rather than in the axial path of ion transmission. This dimensional placement allows the screen to block RF fields in the radial direction while leaving the axial ion transmission path unchanged, thus avoiding impact on geometrical acceptance and ion transmission.
Solution Approach 2:
The conductive screen is applied locally at the radial outer periphery of the first RF component, providing RF shielding only where cross-talk occurs, while leaving the central ion transmission region unaffected. This localized application ensures that ion transmission through the geometrical acceptance is not impeded.
3Object-affected harmful factors
If axial extensions are added to electrodes to compensate for capacitive coupling, then cross-talk is reduced, but fabrication complexity and alignment requirements increase
Solution Approach 1:
A conductive screen is introduced as an intermediary element between the first and second RF components. The screen is positioned at the radial outer periphery of the first RF component and faces the second RF component, acting as a mediator to block RF electric field cross-talk without interfering with ion transmission through the geometrical acceptance path.
Solution Approach 2:
The RF shielding function is segmented from the main RF component structure. Instead of modifying the electrodes themselves with extensions, a separate conductive screen is used to provide the shielding function, simplifying fabrication and alignment requirements.
4Productivity
If RF components are placed in close proximity to maintain high ion transmission, then ion transmission is maintained, but RF cross-talk increases causing resolution degradation
Solution Approach 1:
A conductive screen is introduced as an intermediary element between the first and second RF components. The screen is positioned at the radial outer periphery of the first RF component and faces the second RF component, acting as a mediator to block RF electric field cross-talk without interfering with ion transmission through the geometrical acceptance path.
Solution Approach 2:
The conductive screen is positioned in the radial dimension at the outer periphery of the first RF component, rather than in the axial path of ion transmission. This dimensional placement allows the screen to block RF fields in the radial direction while leaving the axial ion transmission path unchanged, thus maintaining high ion transmission while eliminating cross-talk-induced resolution degradation.
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 arrangement effectively eliminates cross-talk, maintaining high ion transmission rates while preventing resolution changes and electric field distortions, simplifying system performance and optimization.
Implementation Method 1
a conductive electric field screen located at a radial outer periphery of the first set of electrodes such that it does not impose any geometrical restriction on the acceptance of the second RF component, and facing the electrodes of the second set as to reduce RF electric field cross-talk between the electrodes of the first set and those of the second set
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2A~2B
AI summary
The invention generally relates to an assembly of a first RF component and a second RF component in a mass spectrometer, the first RF component comprising a first set of electrodes and the second RF component comprising a second set of electrodes, wherein the RF components are located and aligned end-to-end to one another, and wherein a transverse dimension of the electrodes of the first set is smaller than that of the electrodes of the second set. The assembly further comprises a conductive electric field screen located at an outer periphery of the first set of electrodes and facing the electrodes of the second set as to reduce RF electric field cross-talk between the electrodes of the first set and those of the second set. The invention affords for technically simple and economic means to reduce cross-talk or capacitive coupling between adjacent RF components in a mass spectrometer.