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Electron gun
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== Measurement and detection == [[file:Ekanoner.jpg|thumb|Electron gun from a [[travelling-wave tube]], cutaway through axis to show construction]] A [[nanocoulombmeter]] in combination with a [[Faraday cup]] can be used to detect and measure the beams emitted from electron gun and [[ion gun]]s. Another way to detect electron beams from an electron gun is by using a [[phosphor]] screen which will glow when struck by an electron.
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