The output power is coupled out near the electron gun. Inside the bulb there is an electron gun. The electrons are first produced by a 100 KeV triode electron gun. In this case, the electron gun acceleration potential limits the emission current. The latter two contained an electron gun with deflecting plates. The electrons are fired into one end of the tube by an electron gun. For electron gun scanning systems, the spot usually has a Gaussian intensity distribution. Electrons are generated with an electron gun, of which there are many varieties. They then used an electron gun to weld several of the girder's joints. The electron gun compensates for the arriving electric current. For general surface characterization, the electron gun is operated the range of 10-30 keV.