IVNC2021-ShortCourse-STsujino

12
Jul

IVNC2021-ShortCourse-STsujino

On the Brightness, Emittance, and Coherence of Field Emission Beam

Soichiro Tsujino (Paul Scherrer Institut)

IVNC 2021 Tutorial, July 5, 2021, virtual/Lyon, France,

The highly brilliant electron beam produced by field emitters is one of the critical ingredients for the development of high resolution electron microscopes achieving atomic resolution[1–4]. The high current, high current density, and high beam brightness of electron beams orignating from field emission tip sources have been also intensely studied in the past for several applications including high frequency vacuum tubes[5,6], accelerators[7–9], time-resolved electron diffraction[10,11], coherent imaging[12,13], to name a few. In this tutorial, after a brief overview of the development of the atomic-resolution electron microscopes[1–3,19], we will introduce key concepts for beam applications such as the brightness, the transverse emittance, and the transverse coherence length of field emitters[2–4,14–17,19] and review recent measurements on the transverse emittance9 and the transverse coherence length[11,18]. Finally, the importance of the coherence within the source and the transverse structure of the wave function of field emission electrons on the propagation and the spot size of field emission beam will be discussed[12–15,20].

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73–89, Springer Science+Business Media LLC.
[20] Tsujino, S. (2018) J. Appl. Phys.124, 044304.

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