TOF-MS Detector Flange Alignment for MCP Perpendicularity
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Solution Overview
Problem
Conventional time-of-flight mass spectrometry systems face challenges in maintaining the accuracy of the microchannel plate (MCP) incident surface perpendicular to the ion beam axis, which affects the mass resolution capability.
Innovation Solution
A charged particle detecting apparatus with a flange portion on the first electrode, fixed using an insulating screw, reduces the number of interposed members between the MCP and the cabinet, ensuring precise alignment and improving mass resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flange is used to mechanically connect the detector to the spectrometry system, then the detector can be securely fixed, but the incident surface of the MCP group becomes difficult to maintain perpendicular to the ion beam axis
Solution Approach 1:
The detector is divided into two functional parts: a fixing flange for mechanical connection and an MCP group assembly for detection. The flange and MCP group are positioned at different locations, allowing independent optimization of each function without mutual interference.
Solution Approach 2:
A spacer member is introduced as an intermediary component between the flange and the MCP group. This spacer provides precise positioning and maintains the perpendicularity of the MCP incident surface to the ion beam axis, while the flange handles the mechanical fixation to the spectrometry system.
2Reliability
If multiple components are arranged between the MCP and the cabinet for fixation, then the detector can be securely mounted, but the alignment accuracy of the MCP incident surface deteriorates
Solution Approach 1:
The fixing function is extracted from the MCP group assembly and transferred to a separate flange component. This allows the MCP group to be mounted with minimal interposed members, preserving alignment accuracy, while the flange provides secure fixation to the cabinet.
Solution Approach 2:
A minimal number of precision spacers are used as intermediaries between the flange and MCP group, reducing the cumulative alignment errors that would occur with multiple components. The spacer design minimizes the number of interfaces while providing necessary mechanical support and positioning.
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 enhances the accuracy of the MCP's incident surface with respect to the ion beam axis, thereby improving the mass resolution capability of the time-of-flight mass spectrometry system.
Implementation Method 1
detecting ions that have flied through the ion flying region
Implementation Method 2
ions emitted from the sample 120 are accelerated by an electric field formed between the sample 120 and the electrode 130
Data Source
AI summary
In a charged particle detecting apparatus 100 for which an MCP is sandwiched with an IN electrode 1 and an OUT electrode and an anode electrode and a rear cover are installed therebehind, the component members in the rear of the IN electrode 1 are arranged further inside than the IN electrode 1 when viewed from an MCP incident surface, and the charged particle detecting apparatus 100 is fixed by screwing and the like to a cabinet wall surface 330 of a TOF-MS by using a flange portion provided at a part of IN electrode 1 projected further outside than the rear component members.