hairpin filament
hairpin filament
A filament used for a thermoelectron source. A thin tungsten (W) wire is curved to form a hairpin shape and this filament is directly heated at about 2800 K. Its brightness is 5×105 A/cm2・sr at 200 kV. The size of the crossover is ～20 μm. The energy spread of the emitted electrons from the filament is ～3 eV. Nowadays, most electron microscopes are equipped with a LaB6 cathode.
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