Blown Electron Microscope Filament

Camera: Apple iPhone XS
Exposure: 1/60
Aperture: f/1.8
Focal Length: 52mm equivalent
ISO: 100

This is the result of a blown filament that generates 120 thousand electron volts from a transmission electron microscope depositing tungsten onto the inside of the Wehnelt cap.  It sounds bad, but the filament is a use item.  Because we run our electron microscopes so hard, we probably blow more filaments than most.  Though, that said… these filaments last at least 30% longer the harder you use them, compared with how normal electron microscopy facilities use their electron microscopes.

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