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. 2015 Sep 2;2(5):051101. doi: 10.1063/1.4930174

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© 2015 Author(s).

2329-7778/2015/2(5)/051101/7

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FIG. 1. — (a) Three distinct UEM modes—single-electron, burst, and single-shot—and the corresponding parameters (number of electrons per packet and total number of packets). (b) Electron-gun geometry of a self-biasing Wehnelt assembly and LaB₆ emission source. Pertinent components and beam properties are labeled. The probe-laser path and final steering mirror are also shown. (c) Illustration of the simulation parameters Z_tip (distance from LaB₆ tip to outer surface of the Wehnelt diaphragm) and D_Weh (diameter of the Wehnelt aperture). The two tip sizes investigated in the simulations (16 and 150 μm) are also noted.