{"id":6983,"date":"2021-02-25T16:43:36","date_gmt":"2021-02-25T16:43:36","guid":{"rendered":"http:\/\/eds.kpi.ua\/?page_id=6983"},"modified":"2021-02-25T18:07:31","modified_gmt":"2021-02-25T18:07:31","slug":"cold-cathode-glow-discharge-electron-guns-and-its-using-in-technological-equipment","status":"publish","type":"page","link":"https:\/\/eds.kpi.ua\/?page_id=6983","title":{"rendered":"Cold cathode glow discharge electron guns and its` using in technological equipment"},"content":{"rendered":"

Glow discharge electron guns with cold cathodes<\/strong> are used for welding, brazing, evaporation, melting of refractory metals, as well as other technological operations which are provided by electron beam in a soft vacuum or controlled gas medium. High voltage glow discharge with anode plasma maintained in pressure range of few Pa and accelerations voltages units-tens of kV is used in such guns for generation of electron beam. Cold cathode from metal is used there as an emitter of free electrons. Therefore, emission of electrons is a result of bombarding of cathode surface by the ions from anode plasma. Plasma have a near-anode potential, so discharge region can be considered as an electron-optical system with a transparent anode. According to wide range of operation voltage and pressure, glow discharge electron gun's power can be in range of from hundreds of watt to hundreds of kilowatt. Minimal diameter of electron beam in crossover can be less then 1 mm2<\/sup>, and so maximum power density - 106 <\/sup>W\/cm2<\/sup>. Elaborated electron guns are completed by the electronic control systems.<\/span><\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>

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