Comparison of Different Optimization Techniques in Electron Lens Design

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Abstract

To design electron lens systems, applying a fully automated optimization routine has not yet been feasible, especially for the case where the optimization has many free variables of the lens system, such as all parameters that define the geometry of the lens electrodes and the voltage of each electrode. Hence, the study of the implementation of different optimization procedures has not yet been possible either. In one of our previous studies, we have proposed to use the so-called Second Order Electrode Method (SOEM) which performs the electrostatic field calculations in a very short time by the approximations of the field near the optical axis. There, using SOEM in field calculation, a Genetic Algorithm (GA) was successfully implemented to optimize the electron lens systems. One of the questions that has not been studied and answered in the literature yet, is whether the GA is the most suitable option among different optimization techniques for the design/optimization of electron lens systems. In this paper, by implementing the SOEM technique as the field calculation method, different optimization procedures are implemented and their performances are compared. For this study, a typical six electrode lens system is employed. The implemented optimization techniques include calculus-based local optimization (‘Fmin’) and metaheuristic methods such as GA, Particle Swarm Optimization (PSO), and Simulated Annealing (SA). The results demonstrate that the population-based global optimization techniques like GA and PSO significantly outperform single-based local optimization methods such as ‘Fmin’ and SA. Additionally, PSO shows slightly better performance than GA, although it cannot be concluded that PSO will always outperform GA for every electron lens design problem. Furthermore, in the comparison between the two single-based optimization techniques, the metaheuristic approach (SA) outperforms the calculus-based one (‘Fmin’). Hence, we recommend implementing metaheuristic, global, population-based optimization techniques like GA and PSO for the optimization electron lens systems.
Original languageEnglish
Title of host publication2023 9th International Conference on Optimization and Applications, ICOA 2023 - Proceedings
EditorsHanaa Hachimi, Ahmed Abu Abdo, Zoubida Benmamoun
PublisherIEEE
Number of pages5
ISBN (Electronic)979-8-3503-1254-6
ISBN (Print)979-8-3503-1255-3
DOIs
Publication statusPublished - 2023
Event2023 9th International Conference on Optimization and Applications (ICOA) - AbuDhabi, United Arab Emirates
Duration: 5 Oct 20236 Oct 2023

Publication series

Name2023 9th International Conference on Optimization and Applications, ICOA 2023 - Proceedings

Conference

Conference2023 9th International Conference on Optimization and Applications (ICOA)
Country/TerritoryUnited Arab Emirates
CityAbuDhabi
Period5/10/236/10/23

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • Electron Electrostatic Lens Design
  • Global Optimization
  • Local Optimization
  • Meta-heuristic based Optimization Algorithms
  • Genetic Algorithms
  • Particle Swarm Optimization
  • Simulated Annealing
  • SOEM (Second Order Electrode Method)

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