使用微分代数方法计算微镜阵列的偏差计算
Jintao Hu1, Lei Yue1, Yihao Ma1
1Key Laboratory for Physical Electronics and Devices of the Ministry of Education, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China.
Ultramicroscopy
|December 6, 2024
概括
本研究引入了一种使用微分代数计算微镜阵列 (MLA) 中高阶偏差的新方法. 该方法准确地模拟复杂的电场,以提高电子束系统的性能.
科学领域:
- 光学和光子学 在光学和光子学.
- 带电粒子光学 带电粒子光学
- 计算物理 计算物理
背景情况:
- 微镜头阵列 (MLA) 是多电子束系统中的关键组件,用于聚焦子束.
- 精确计算偏差对于优化系统性能至关重要.
- 现有的方法可能无法完全解释MLAs内部复杂的现场相互作用.
研究的目的:
- 在MLA中开发一种新的方法来计算轴向和离轴微镜的高阶偏差.
- 为了纳入来自邻近结构和旋转对称场的多极场的影响.
- 为MLA设计提供了对误差的全面分析.
主要方法:
- 使用微分代数 (DA) 方法进行偏差计算.
- 采用了亚齐穆塔尔里埃分析和里埃-贝塞尔数列扩展来分析电场.
- 将字段组件转移到DA参数中进行计算.
- 开发并应用了DA理论和算法,用于同时计算偏差.
主要成果:
- 通过使用单个参考射线轨迹,成功计算了轴向微镜和离轴微镜的初级和高阶偏差.
- 分析了 dodecapole 字段对模拟 MLA 的异常的影响.
- 证明了DA方法处理复杂场相互作用的能力.
结论:
- 拟议的基于DA的方法提供了一个准确和有效的方法来计算MLAs中的误差.
- 了解和量化高阶偏差,包括来自多极场的偏差,对于先进的电子束系统设计至关重要.
- 这项工作为优化各种应用中的MLA性能提供了有价值的工具.
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