Multipole Assembly Using Guide Grooves for High Precision
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Solution Overview
Problem
Existing methods for assembling multipole elements in charged particle beam apparatuses face challenges such as difficulty in achieving high accuracy, ease of assembly, and reproducibility, particularly with increased complexity and the need for precise adjustment and alignment, which are exacerbated by the generation of parasitic multipole fields and the limitations of existing assembly techniques like wire cutting and ceramic-based structures.
Innovation Solution
A structure utilizing metallic multipole members with guide grooves in a cylindrical housing and setscrews for easy assembly and alignment, allowing for precise positioning and fixing of multipole elements with minimal components, enabling high reproducibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a positioning member is used to press and fix multipole elements against it, then positioning accuracy can be improved, but it becomes difficult to pull out the positioning member without causing damage to the distal ends of the multipole elements
Solution Approach 1:
A cylindrical housing serves as an intermediary component that provides guide grooves for positioning multipole elements during assembly. The housing acts as a mediator between the positioning requirement and the multipole elements, allowing accurate positioning through the guide grooves while enabling easy assembly by facilitating the insertion and fixation process without requiring extraction of a positioning member
Solution Approach 2:
The assembly is segmented into distinct functional components: a cylindrical housing with guide grooves, multipole elements, and setscrews. This segmentation allows each component to perform its specific function independently - the housing provides guidance, the elements are positioned accurately, and the setscrews provide fixation - thereby resolving the contradiction between positioning accuracy and ease of assembly
2Manufacturing precision
If spacers are arranged inside the cylindrical housing to position the multipole, then positioning accuracy can be improved, but the number of components increases significantly making assembly time-consuming and difficult
Solution Approach 1:
The cylindrical housing combines multiple functions into a single component: it provides structural support, contains guide grooves for positioning, and serves as the mounting structure for setscrews. This merging eliminates the need for separate spacers and positioning members, reducing the total number of components while maintaining positioning accuracy through the integrated guide grooves
Solution Approach 2:
The cylindrical housing performs multiple functions simultaneously - it acts as a container, a positioning guide through its grooves, and a mounting structure. This multi-functionality reduces component count while ensuring accurate positioning of multipole elements during assembly
3Manufacturing precision
If multiple spacers are assembled tightly within the housing to maintain positioning accuracy, then positioning accuracy can be improved, but assembly becomes difficult because the spacers cannot be held
Solution Approach 1:
The guide grooves are pre-formed on the cylindrical housing before assembly. This preliminary action provides built-in guidance that automatically positions multipole elements accurately during the assembly process, eliminating the need for separate spacers that would require tight assembly and holding operations
4Ease of manufacture
If asymmetry screw holes are machined on the circumferential surface to hold the spacer, then the spacer can be held during assembly, but the positioning accuracy cannot be maintained
Solution Approach 1:
The guide grooves provide localized positioning guidance at the precise locations where multipole elements need to be positioned. This local quality approach ensures that positioning accuracy is maintained at critical interfaces without requiring asymmetry screw holes that would compromise precision while still enabling easy assembly through the guide structure
5Ease of operation
If pins are used to fix individual multipole elements on a base plate, then assembly can be simplified, but measurement and decentering machining of the pin must be repeatedly required spending significant time and effort
Solution Approach 1:
The guide grooves are pre-formed on the cylindrical housing with precise dimensions and orientations. This preliminary action eliminates the need for repeated measurement and decentering machining operations that would be required if pins were used, as the guide grooves provide built-in positioning references that guide multipole elements into correct positions during assembly
Solution Approach 2:
The complex measurement and machining operations are extracted from the assembly process itself and replaced by pre-formed guide grooves. The positioning function is separated from the assembly action, allowing elements to be positioned accurately through the guide structure rather than requiring complex pin machining during assembly
Data Source
AI summary
In order to realize a multiple assembled easily with high accuracy, a multipole having assembly accuracy within 10 micrometer and within several seconds of angle is achieved by fixing multipole elements by being guided by grooves provided on an inner side of a cylindrical housing to form the multipole.