SU63819A3 - Device for high-speed modulation of an electron beam - Google Patents

Description

The present invention relates to lamps for VHF, more precisely to electronic lamps for centimeter waves with a speed modulation of an electron beam.

This invention aims to improve the means for modulating the electron flow rate.

The object of the present invention is a device for high-speed modulation of an electron beam, characterized by the use of an axial magnetic field, whose axis coincides with the direction of movement of the beam and with the axes of a pair of split cylindrical anodes, whose length is equal to half a centimeter range.

The invention is illustrated in the drawing, which shows a perspective view of one embodiment of the invention.

The electron source 1, the truncated conical control electrodes 3, b, and the cylindrical electrode 7 are located at one end of the evacuated balloon 9 containing the conductive layer 10. The first half-wave split anode

// located inside the pLa balloon; a house with a cylindrical electrode and coax with it. The second half-wave split anode 13 is located in the balloon coaxially with the first and at a distance from it. The lines 15, 17 are connected: the yens are respectively with the iher and the second half wave and electrodes and terminate with an input circuit 19 and an output 2 / representing, for example, antennas. The ends of the cut anodes are connected by shorting rings 25. A hollow conical collecting electrode 25 is located between adjacent ends of the electrodes // and 13. The second collecting electrode 27, made up of several triangular rally blades, is placed next to the end of the second split anode. The cylindrical electrode 7 and the split anodes //, 13 are relative to the electron source / positive potential. Direction; The collecting electrodes 5, 5 and collecting 25, 27 are also under positive potential. The balloon is surrounded by a solenoid 50, shown in the sectional view. Auxiliary solenoids 31 are located near the electron gun to increase the magnetic field at the third point. Solenoids are fed from source 33. Of course, magnetic fields can be created by permanent magnets or other means. The device proceeds as follows. The electrons emitted by the source in the absence of a magnetic field move along straight lines and, when emitted from several points, are not grouped into a narrow beam, but spread over a considerable area. Under the magnetic and electric fields, the electrons spiral helically outward. At the same time, the increased magnetic field and the distribution of the electric field in the vicinity of the electronic source. A reduced magnetic field and an increased electric field, followed by a reduced magnetic field and an increased electric field, cause the electrons to form, firstly, a hollow rotating translational: .th cylinder with increasing diameter and and, second, a rotating hollow cylinder. The first cylinder is continuously moving forward the gun to the final collecting electrode 27. If the m-1 aole is adjusted so that the period of rotation of the electrons in the split anodes // and 75 will be the same as the period of the currents applied to the input line 19, then the electrons will pass the gap between the anodes in the same phase. If necessary, you can take several gaps, then the period of the applied current will be a multiple of the period of rotation. Thanks to sroiwy some electrons will be slowed down and others accelerated. Accelerated electrons will have increased radii of the paths, and slowed down conversely - reduced. Slowed electrons moving in smaller circles will be collected by a conical electrode 25, which is designed so that it can dissipate the heat that develops as a result of blows

electrons. After the removal of slower electrons, a rotating cylinder of electrons with a variable density of barrels remains, due to which an increased voltage arises at the second cut of the anode 13, which through the / 7 line enters the output circuit 21. The electrons pass through the second or output permit , stalkvagots with the flanges of the last collecting electrode 2., respectively, polarized, radially arranged and triangular in shape, affect this way that 1, so that the nearest electrons affected by The leg of the flanges, are attracted. Any BECHHIC secondary electrons will be trapped by flanges. The final collecting electrode is made of a material that emits the heat generated by the electronic shocks without the evolution of gases.

The device described above is a speed modulated VHF amplifier. Electrons, rotating inside the split anodic IX electrodes and forming hollow cylinders, are directed to the collecting electrodes. In the first split anode, electrons are grouped or modulated to form a variable charge density, and slower electrons are collected. The electrons modulated in this way generate an amplified voltage in the second split anode and are collected by the final electrode. The number of modulations in the split anode electrode depends on the speed at which electrons rush to the last electrode. A multiple of molations can be easily and efficiently obtained in a small gap. The number of rotations that the electrons perform inside the split electrode can be adjustable, meaning that: the more rotations, the greater the sensitivity, however, the system's bandwidth becomes smaller. The desire for regeneration becomes larger, since electrons — with reduced orbital diameters — have less wiring electrodes, and, to some extent, density effects: —Arror affects even earlier than moving electrons slower.

If the input 19 and the output 21 are feedback-coupled in the proper phase, continuous oscillations are created.

Patent Subject

The device for the high-speed modulation of the electron beam is different; e with the use of an axial magnetic field whose axis coincides with the direction of movement of the electron electrons and with the axes of a pair of split cylindrical anodes whose length is equal to a P0-1 wavelength of the centimeter range.