New design for a field emission electron gun immersed in a magnetic lens field

Kenichi Saito; Hirofumi Morita; Nobuo Shimazu; Yasumichi Uno

doi:10.1117/12.221572

25 September 1995 New design for a field emission electron gun immersed in a magnetic lens field

Kenichi Saito, Hirofumi Morita, Nobuo Shimazu, Yasumichi Uno

Proceedings Volume 2522, Electron-Beam Sources and Charged-Particle Optics; (1995) https://doi.org/10.1117/12.221572
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

This paper describes a new design for a field emission electron gun immersed in a magnetic- lens field. Its low aberration yields both a high brightness and a high emittance. A single-pole- like magnetic lens made a water-cooled pipe coil produces a magnetic flux density of 0.28 T at the emitter tip. The spherical aberration of the gun, as calculated by an electron ray tracing program, is only 1/3 that of a conventional gun with a magnetic lens. A prototype of the gun was constructed using a zirconium-oxide/tungsten thermal-field emitter. The measured crossover diameters agree with those calculated by the ray tracing program, confirming that the aberration is very low.

Citation Download Citation

Kenichi Saito, Hirofumi Morita, Nobuo Shimazu, and Yasumichi Uno "New design for a field emission electron gun immersed in a magnetic lens field", Proc. SPIE 2522, Electron-Beam Sources and Charged-Particle Optics, (25 September 1995); https://doi.org/10.1117/12.221572

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