Optimization of Focusing Systems for Ultrafast Electron Microscopy
Ultrafast electron microscopy, using MeV-scale beam energy, promises the ability for very high combined spatial and temporal resolution. Focusing elements based on permanent magnet quadrupoles, with very high gradients, offer the potential to achieve high resolution in the image. When permanent magnet quadrupoles are employed in specific arrangements of multiplet lens arrays it is also possible to control for spherical and chromatic aberrations. However, using mm-scale permanent magnet quadrupoles present difficulty in machining, assembly, and alignment when used in multiplet lens configurations. In this project, we developed a multi-objective genetic algorithm optimizer in a start-to-end simulation package for the optimization of the the design of permanent magnet quadrupoles, and their deployment in multiplet lensing systems. The optimizer was validated and compared to different test cases, including a relevant example of a novel quintuplet array for MeV beams, which yields high magnification with suppressed aberrations. The results lay the foundation for a future proof-of-concept experiment on the implementation of the quintuplet imaging lens array on a MeV beamline at the Brookhaven National Laboratory Ultrafast Electron Diffraction facility.
- Research Organization:
- RadiaBeam Technologies, LLC, Santa Monica, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- SC0018562
- OSTI ID:
- 1493066
- Type / Phase:
- SBIR (Phase I)
- Report Number(s):
- DOE-RBT-18562-1
- Country of Publication:
- United States
- Language:
- English
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