Abstract:
An ion plasma electron gun for the generation of large area electron beams with uniform electron distribution. Positive ions generated by a wire in a plasma discharge chamber are accelerated through an extraction grid into a second chamber containing a high voltage cold cathode. These positive ions bombard a surface of the cathode causing the cathode to emit secondary electrons which form an electron beam. After passing through the extraction grid and the plasma discharge chamber, the electron beam exits from the gun by way of a second grid and a foil window supported on the second grid. The gun is constructed so that the electron beam passing through the foil window has a relatively large area and a uniform electron distribution which is substantially the same as the ion distribution of the ion beam impinging upon the cathode. Control of the generated electron beam is achieved by applying a control voltage between the wire and the grounded housing of the plasma chamber to control the density of positive ions bombarding the cathode.
Abstract:
The microbiological and chemical activity of water containing microorganisms and other impurities is reduced by irradiating such water with high energy electrons. A device mixes the water with a gas to supply the water with oxygen and the water passes through a constricted region wherein the electron beam irradiates the water. The structure of the several embodiments of the constricted region results in an economical system that uniformly and sufficiently irradiates the water passing therethrough.
Abstract:
An improved nozzle for an energy beam system including an outer hollow cylindrical sleeve having an internal radial plate across the interior of the sleeve with the plate having axial passages therethrough, an inner hollow tubular sleeve telescopically mounted in one end of the outer sleeve, and an elongated hollow electrode telescopically mounted interiorly of both sleeves and radially spaced apart from the inner sleeve.
Abstract:
An apparatus for generating stimulated emission light pulses of extremely high power up to 5 megawatts by electron beam pumping of laser type light emitting material, is described which employs an electron beam of extremely high current up to 6000 amperes at 450 kiloelectron-volts produced by field emission initiated vacuum arc operation of an electron tube having a field emission cathode. The field emission cathode structure has a plurality of separate needle shaped emitting elements. The laser material is mounted either on an anode inside the evacuated tube envelope or outside of the envelope adjacent an electron transparent anode window. Coherent light may be produced by causing oscillation of the light in an optical resonant cavity provided by a pair of parallel mirrors on opposite sides of the laser material.
Abstract:
This disclosure relates to generating an elongated electron beam curtain with the aid of an elongated tubular cathode structure transversely supported against sagging and distortion from a partially surrounding heat-reflecting thermal barrier channel support, particularly adapted for mounting with Pierce type or other beam-forming electrode structures.
Abstract:
A method of increasing the energy output of an electron accelerator by scanning the electron beam produced in the accelerator in a manner so that excessive heat build-ups do not occur at the electron permeable window structure through which the beam passes to exit the accelerator. This method is used in conjunction with an accelerator having at least two elongate, electron permeable windows arranged in a side-by-side orientation and scanning coils allowing the beam to be scanned parallel to at least two, perpendicular axes. The method provides that the beam is scanned along the length of a first of the windows in a first direction and then instantaneously is scanned laterally to the second of the windows. The beam then is scanned along the length of the second of the windows in a second direction 180* from the first direction. A return of the beam to its original position is accomplished as the beam then is scanned laterally and instantaneously a second time such that it again is directed at the first of the windows. Unlimited repetition of these scanning steps is possible.
Abstract:
The invention relates to the irradiation of coatings and similar materials wherein a relatively large surface of complex shape is to be irradiated. The invention employs a modular construction wherein each module comprises a relatively small and independently movable electron accelerator which is complete but for the provision of the accelerating voltage. In general, apparatus is used having a common insulating housing and a common voltage source. In the housing are mounted independently movable electron accelerators. A multiplicity of these accelerators is arranged so as to provide a wide array of generally parallel electron beams which are positioned so as to overlap at the surface of the product to be irradiated. Depending upon the nature of the surface, the electron beams may or may not be actually parallel, the purpose being to insure that each electron beam impinges on the surface to be irradiated normal thereto.