By Merijntje Bronsgeest
The Schottky electron emitter is a major electron-emitting resource in today’s electron beam gear. This e-book comprehensively covers the Schottky emitter, facing its theoretical in addition to useful facets. the most questions which are addressed during this e-book are: what's the Schottky electron emitter? How does it paintings? and the way do its homes impact the functionality of electron beam equipment?
The concentration is at the direct hyperlink among the working stipulations of the resource and the houses of the beam on the aim point. This coupling is made transparent by way of discussing the influence of the working stipulations and the geometry of the resource and gun at the emission houses of the emitting floor, the impression of Coulomb interactions at the brightness and effort unfold within the first few millimeters of the beam direction, and the impression of the working stipulations and the form of the emitter at the results of the beam on the goal. the ultimate bankruptcy combines these kind of results to illustrate that there's a trade-off to be made among brightness, strength unfold, and form stability.
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Extra info for Physics of Schottky Electron Sources: Theory and Optimum Operation
For simplicity we approximate the emitter with a rotationally symmetric shape and launch a few electrons from a few different positions on the surface perpendicular to the surface with the average thermal energy of 1,800 K. 3 kV with respect to the emitter. The simulations show that at “normal” operating conditions (left) only the emission from the central end facet passes the extractor aperture (∆ 380 mm) and that the emission from the Applying a Bias cone hits the extractor. As shown on the right in Fig.
This is not the case: the rays launched further away from the facet center experience a stronger total angular deflection relative to the rays launched from positions closer to the facet center. This is consistent with a negative lens effect with positive spherical aberration. By extrapolating the tangents of the rays back from the field-free zone toward the emitter we find the position where they cross the optical axis. The position of this point with respect to the position of the facet is given in Fig.
This will be used in Chapter 5. To support the interpretation of the experimental patterns we reproduce the results qualitatively with simulations. For simplicity we approximate the emitter with a rotationally symmetric shape and launch a few electrons from a few different positions on the surface perpendicular to the surface with the average thermal energy of 1,800 K. 3 kV with respect to the emitter. The simulations show that at “normal” operating conditions (left) only the emission from the central end facet passes the extractor aperture (∆ 380 mm) and that the emission from the Applying a Bias cone hits the extractor.