Development of an Ultrafast Low-Energy Electron Diffraction Setup by Max Gulde

Author:Max Gulde
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

The exact alignment of the tip within the suppressor aperture is performed manually under an optical microscope and requires experience and patience. It is found that a correct alignment is essential to avoid blocking a large part of the electron beam by the apertures of the lens assembly (see also Sect. 4.​3).

Fig. 5.3Conceptual drawing of the ultrafast electron gun. Inset displays magnified version of tip region denoted by dark rectangle

The suppressor unit with tungsten tip is subsequently aligned within the lens system as shown in a conceptual drawing of the assembled gun in Fig. 5.3. To avoid the high electric fields from the lens to alter electron trajectories outside of the gun, the whole gun is mounted within a shielding Faraday cup, which also comprises the anode (at ground potential) of the lens system. The total propagation distance within the lens system from the tip apex to the outside of the aperture is taken to be mm. The experimental setup in which the developed electron gun is employed is described in the next section.

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