FIELD: electronic engineering; specific electrometallurgy for electron-beam method of melting metals and alloys.
SUBSTANCE: proposed gaseous-discharge electron gun has encapsulated concave cold cathode provided with developed emissive surface and mounted on high-voltage insulator, as well as beam guide disposed coaxialy to anode and incorporating focusing coils. Beam guide is provided in addition with at least three rods made of high-melting electricity conductive material and uniformly disposed between focusing coils over circumference; these rods are radially inserted into beam guide through depth corresponding to diameter of electron beam; they are interconnected on outside of electron gun and connected to current collector which is electrically connected to focusing coils for correcting their parameters, dimensions of electrode system being chosen from following expression: Dc > Da > Rcrv, where Dc is cathode diameter; Da is anode aperture diameter; Rcrv is curvature radius of cathode effective surface.
EFFECT: enhanced stability of power characteristics and geometry of electron beam.
4 cl, 3 dwg
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