tungsten filaments are made with specially designed jigs which ensure accuracy and reproducibility in production. High-ductility tungsten wire is used to minimise strain. All filaments are stress relieved by flashing in a vacuum at temperatures above the normal operating level and are then checked for accuracy of centring. Filament assemblies having alignment screws are subsequently adjusted using a light microscope to ensure that they are ready for immediate operation in the electron microscope.
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