A differential algebra method for aberration analysis of variable-axis lens system
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN: 0168-9002, Vol: 1048, Page: 167921
2023
- 4Citations
- 2Captures
Metric Options: CountsSelecting the 1-year or 3-year option will change the metrics count to percentiles, illustrating how an article or review compares to other articles or reviews within the selected time period in the same journal. Selecting the 1-year option compares the metrics against other articles/reviews that were also published in the same calendar year. Selecting the 3-year option compares the metrics against other articles/reviews that were also published in the same calendar year plus the two years prior.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Article Description
A variable-axis lens (VAL) is an effective method for achieving a large field of view with high resolution because it can preserve small aberrations by shifting the optical axis according to the deflection of the electron beam, even when the beam is deflected to regions far from the central straight optical axis. However, for systems consisting of such a VAL, conventional methods for calculating aberration coefficients that refer to the central straight optical axis could be meaningless. Here, we propose a novel approach, based on the differential algebraic(DA) method, for calculating high-order aberration coefficients for VAL systems. Instead of using the straight optical axis as a reference, we trace only one electron trajectory in such a system. Then, the linear optical properties and the geometric aberration and chromatic aberration coefficients up to 5th rank are calculated (with high accuracy) and analyzed with reference to the reference trajectory. In comparison with conventional methods, the proposed DA approach shows overwhelming advantages in having analyzed the dispersion, focus error and 2nd rank aberration coefficients. A new software package was developed, and an example was shown to demonstrate the proposed approach.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S016890022201213X; http://dx.doi.org/10.1016/j.nima.2022.167921; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85144457506&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S016890022201213X; https://dx.doi.org/10.1016/j.nima.2022.167921
Elsevier BV
Provide Feedback
Have ideas for a new metric? Would you like to see something else here?Let us know