The electrons are generated in an electron source, by heating a tungsten cathode, which is encapsulated by a negatively charged so called repeller that prevents stray electrons from coming into the detector unit.
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2 ) The potential difference is great enough to ionize the air ( without needing say stray electrons ), creating free charges which can then be accelerated by the potential difference to create a current.
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"What worries military people the most isn't detonation by design, but by unauthorized use, screw-up and miscalculation, a stray electron or misreading the screen, " said Michael Krepon, president of the Henry L . Stimson Center, which studies security.
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A few remedies have been proposed to deal with this, such as putting ridges in the accelerator tube, adding antechambers to the tube, coating the tube to reduce the yield of electrons from the surface, or creating an electric field to pull in stray electrons.
