Beam generating system for electron tubes, particularly travelling wave tubes
AssigneeSiemens Aktiengesellschaft
InventorErwin Huebner
Life of this patent
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Abstract
A beam generating system for electron tubes, particularly travelling wave tubes, is formed of a beam shaping electrode and a dispenser cathode supported therein having an emission disk at its end face. A positional change of the dispenser cathode in the beam shaping electrode at different ambient temperatures is suppressed with the beam generating system, and thus a beam defocussing is avoided. According to the invention, the dispenser cathode is directly connected to the beam shaping electron and is connected below the emission disk by means of a radial cathode support. The beam generating system of this type is particularly employed in travelling wave tubes.
Claims12
In a beam generating system for electron tubes formed of a beam shaping electrode, an emission disk with a dispenser cathode directly below the emission disk and which is supported on the beam shaping electrode, and the emission disk being at an end face of the cathode, wherein the improvement comprises:
- said dispenser cathode being directly connected to said beam shaping electrode directly below said emission disk by means of a radial cathode support;
- and
- said radial cathode support having means for preventing movement of the emission disk in a direction causing beam defocusing given temperature changes of the beam generating system.
A beam generating system for electron tubes, comprising:
- a beam shaping electrode, an emission disk, and a heated dispenser cathode directly below the emission disk and which is supported in a central aperture of the beam shaping electrode;
- and
- said dispenser cathode being directly connected to said beam shaping electrode by means of a radial cathode support having flexing means for preventing movement of the dispenser cathode in a direction causing beam defocussing given temperature changes at the beam generating system.
A travelling wave tube beam generating system, comprising:
- a cylindrical Wehnelt beam shaping electrode having a central aperture;
- an emission disc and a dispenser cathode directly below the emission disk disposed in the aperture, said dispenser cathode having a heater associated therewith, and the emission disk being at the end face of the cathode;
- a radial cathode support attached to the dispenser cathode directly below the emission disk, a periphery of the radial disk being connected to side walls of a central aperture of the Wehnelt electrode;
- and
- said radial cathode support having means for preventing displacement in a direction causing beam defocussing given temperature changes at the beam generating system.
A beam generating system for electron tubes, comprising:
- a beam shaping electrode;
- an emission disc and a dispenser cathode directly below the emission disk having a heater associated therewith, the dispenser cathode being centrally supported with respect to the beam shaping electrode;
- a radial cathode supporting means between the dispenser cathode and portions of the beam shaping electrode for the central support and mounting of the dispenser cathode in a given position with respect to the beam shaping electrode;
- and
- deflection prevention means associated with the radial cathode support to prevent axial deflection of the dispenser cathode in a direction perpendicular to a plane including a major surface of the radial cathode support.
Dependencies are inferred from the claim text.