Fuente: WIPO "tomato" There is described an electron beam emitting device (11) comprising: a generation member (12) configured to be supplied with electrical energy and to emit an electron beam; a hollow casing (14) housing at least the generation member (12), the casing (14) extending along a longitudinal axis (A) and including an aperture (14a) at one axial end portion (16) thereof; and a thermally and/or electrically insulating cover (17) coupled with the casing (14) at said axial end portion (16) for closing said aperture (14a); the emitting device (11) further includes a cooling device (18) configured for cooling the insulating cover (17), the cooling device (18) comprising a hollow flange (19) coupled with the casing (14) at said axial end portion (16), extending at least in part around the longitudinal axis (A) and delimiting, together with an outer surface (16a) of the axial end portion (16), an inner chamber (20) which defines a flow channel for a cooling medium; the flange (19) is welded to said casing (14) at said axial end portion (16).