Focusing an electron-beam array with a multi-hole permanent magnet

K. Hiraoka; K. Tsuno; T. Ando; K. Shimonomura; T. G. Etoh

doi:10.1117/12.2525291

28 January 2019 Focusing an electron-beam array with a multi-hole permanent magnet

K. Hiraoka, K. Tsuno, T. Ando, K. Shimonomura, T. G. Etoh

Proceedings Volume 11051, 32nd International Congress on High-Speed Imaging and Photonics; 110510N (2019) https://doi.org/10.1117/12.2525291
Event: International Conference on High-Speed Imaging and Photonics 2018, 2018, Enschede, The Netherlands

Abstract

A simulation study was performed to confirm the technical feasibility of a magnetic lens consisting of a multi-hole permanent magnet to focus a two-dimensional electron beam array. The permanent magnetic lens has a simple structure, and its interference with the deflection electric field is low. In contrast to expectations, the magnetic field intensity is substantially flat in the central region of the multi-hole permanent magnet with a diameter of 6 mm. Only a slight nonuniformity is observed in the radial direction in this region. Although the outer edge of the magnet strongly distorts the intensity distribution in the peripheral region, the area of the influence is only 1 mm wide. The beam convergence rate in the uniform area is approximately 1/10 for a simple model, and 1/40 for an improved model. This technology is applicable to ultra-high-speed imaging with a temporal resolution of the order of picoseconds. The number of recorded signals is expected to be M2 with 1/M convergence with the deflection in two directions. Therefore, a speed-up of 1600 times is achievable.

Citation Download Citation

K. Hiraoka, K. Tsuno, T. Ando, K. Shimonomura, and T. G. Etoh "Focusing an electron-beam array with a multi-hole permanent magnet", Proc. SPIE 11051, 32nd International Congress on High-Speed Imaging and Photonics, 110510N (28 January 2019); https://doi.org/10.1117/12.2525291

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