Abstract:
The invention concerns a procedure and a means for creating an electron curtain (5) intended to be used in irradiating a surface (8) and adjustable as to its intensity distribution. The electron curtain is elicited by producing with an elongated filament (2) placed in a chamber (1), free electrons in a space (6) surrounding the filament, by accelerating the electrons by means of an electrode structure (3) confining the space and by directing the electron curtain formed by the accelerated electrons out from the chamber through a window (4) permeable to electrons in its wall. It is a substantial novelty in the invention that regulation of the intensity distribution of the electron curtain (5) takes place by use of an elongated body (9) of magnetically soft material and of a row of magnets constituted by magnets (10) placed side by side, one of the two being disposed substantially parallelling the filament (2) behind the filament as seen from the direction of the window (4) of the chamber (1) and the other being disposed outside the window of the chamber before the electron curtain, the basis for the regulation achievable with the magnets being the absorption, dependent on the strength of the magnetic field, of electrons in the electrode structure (3). The magnets (10) being functionally independent of each other, the intensity of the electron curtain can be adjusted to be uniform or to vary as desired at different points of the curtain.
Abstract:
An improved broad beam electron gun having a hot cathode assembly which is comprised of cathode means for generating a substantially hemispherical space-charge distribution, the cathode means including electron emitting structures having principal electron emissive surfaces which lie in hypothetical cylindrical-shaped surfaces, the axes of revolution of which are coincident with the major axis of symmetry of the electron emitting structure, the major axis of symmetry being orthogonal to the plane of the anode, the electron emitting structures variously including concave filament sections which form a tip, cylinders and coils, and wherein an electron beam of broad, uniform cross-sectional area is obtained without a shaping grid.
Abstract:
A device for scanning a beam of charged particles comprises longitudinal and cross-sectional scanning electromagnets (1,4) to deflect the beam, respectively, lengthwise and crosswise over the exit window (2), longitudinal and cross-sectional scanning current generators (5, 6) to energize the respective electromagnets (1, 4), and a variable delayer (7) connected between the longitudinal scanning current generator (5) and the synchronizing input of the cross-sectional scanning current generator (6) so that pulses arrive at the input of the variable delayer (7) at the moments when current in the windings of the electromagnet (1) reaches its peak. The variable delayer (7) provides N delay times different from each other by a value of .DELTA. t and set in succession as the pulses arrive at its input, the values N and .DELTA. t being determined from the following relationships:.DELTA.t.ltoreq.d/2f.sub.1 L; N.gtoreq.1/f.sub.2 .DELTA.twhered--diameter of the charged particle beam,f.sub.1 --frequency of the longitudinal scanning,f.sub.2 --frequency of the cross-sectional scanning,L--value of maximum deflection of the beam along the length of the exit window.
Abstract:
A method and apparatus for merging electrons and ions in a neutralizer region where both are of equal intensity and velocity and directing the beam at a target to be destroyed. The region for merging the beams comprises a plurality of circular electrodes formed in a convex overlapping configuration with circular apertures for receiving ions from a ion source. A separate set of accelerator-decelerator electrodes is positioned to merge the electron beam into the ions in the beam merging region. After the beam leaves the beam merging region it enters an elongated axial magentic field which compresses the beam as it is directed to an object to be destroyed.This device may be housed in a satellite capable of being transported into space and moved within a kill radius of an object. The beam density is determined by the choice of ion species and by merging the beams in a low interaction energy environment.
Abstract:
This disclosure deals with novel techniques for generating longitudinal strips of energetic electron beams through concentric slotted constructions, being quite adaptable for the generation of multiple beams in different directions that are of very narrow angular transverse extent, as for purposes of line irradiation of articles passing the beams, though the techniques herein disclosed are also useful in other applications of electron beam irradiation.
Abstract:
Thermionic filaments are arranged in an array which covers a predetermined area. A spreader electrode which may be in the form of a flat plate is placed on one side of the filaments with an anode being placed on the other side of the filaments, and an accelerator grid, focusing plate and collimation plate being placed in that order between the filaments and the anode. The anode is in the form of a foil through which the electrons pass into an area where they are utilized, such as for example a laser cavity where they are utilized to ionize the laser gas. The foil anode is supported on an apertured structure which facilitates the formation of a vacuum tight seal of the vacuum envelope containing the gun and functions as a heat sink to dissipate some of the heat energy developed in the foil. The anode support structure, focusing plate and collimating plate all have apertures formed therethrough which form a plurality of cylindrical channels, these channels covering substantially the entire surface area of the foil anode. The apertures of the support structure, focusing plate and collimation plate are aligned with each other to provide channeled pathways for the electrons between the filaments and the anode. Potentials are applied to the focusing and collimation plates to focus the electrons into circular beams which efficiently pass through the channels between the filaments and the anode with a minimum dissipation of energy in the structures forming the channels.
Abstract:
Vacuum SHF apparatus comprising a means for forming a charged-particle beam, an accelerating tube for imparting relativistic energies to the charged-particle beam, and a deflection yoke for circular scanning of the beam at an input signal frequency, the accelerating tube and the deflection yoke being arranged coaxially with the beam forming means and successively along the path of the charged-particle beam. The apparatus further comprises an additional magnetic deflection yoke for deflecting the scanned beam outwardly from the longitudinal axis of the apparatus, and an annular travelling-wave resonator. The additional magnetic deflection yoke is preferably made as a cone whose vertex faces the charged-particle beam forming means. The annular travelling-wave resonator is so designed that its broader walls are parallel to the longitudinal axis of the apparatus, the broader walls being provided with annular slots for the charged-particle beam, that has been deflected by the additional deflection yoke, to enter and leave the annular resonator. The annular resonator is provided with means for taking SHF energy therefrom.
Abstract:
A laser comprises a cell containing xenon at high pressure and has its walls previous to high-velocity electrons. The cell is of cylindrical shape and constitutes the anode of a field-emission diode with the cathode of the diode surrounding the anode. Electrons emitted from the cathode thus travel radially inwardly and penetrate the anode walls to excite lasing action.
Abstract:
A laser cavity electron beam injection device provided with a single elongated slit window for passing a suitably shaped electron beam and means for varying the current density of the injected electron beam.
Abstract:
A plurality of thermionic filaments are arranged in side-by-side relationship. A spreader electrode which may be in the form of a flat plate is placed on one side of the filaments, while an anode is placed on the other side of the filaments, with a grid being interposed between the filaments and the anode. The various aforementioned elements are given dimensions and positioned relative to each other and the voltages thereon adjusted so as to shape the trajectory of the electrons to provide a uniform distribution of electrons at the anode with a minimum dissipation of energy in the grid and spreader electrodes.