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We carried out a computer simulation of electron-optical systems of multibeam TV IOT with a single-stage depressed collector and single-beam magnetless mini-IOT (having electrostatic focusing). To enhance beam structure and current throughput the control grids with additional radial jumpers are proposed. The amount of radial and circular jumpers was optimized. Experimental testing of these electron...
The results of designing and simulation of multibeam klystrode for powering up of linear accelerators are presented. Due to special design of input cavity and operation in class C the tube has CW output power 100 kW, efficiency 80%, gain 30 dB at frequency 1300 MHz and power supply voltage 24 kV.
A computer-aided set-up and software are developed for characterization and rejecting of high power microwave transistors on a wafer. To overcome spurious oscillations and increase the accuracy of measurements a special multipin probe is fabricated. The developed software gives opportunities to realize complicated scripts of measurements and testing.
The results of simulation of a new electron optics system, forming high-current sheet electron beam for power orotron, integrated with permanent magnets, are presented. Transversally magnetized rectangle magnets are installed in the plane, and resonant system might be mounted in a direction perpendicular to that of the plane. The electron gun and collector are positioned in inner cavities of pole...
A promising approach (called as alenotron) to wideband amplification in a device based on secondary emission is considered. Numerical simulation has demonstrated stable operation of the tube at large coupling of input cavity with the signal source. A new design of the travelling wave alenotron is proposed.
Results of simulation of multibeam electron-optic system are presented. The system can be used in miniature millimeter wave TWT with reverse magnetic focusing system. A special technique for decreasing of transverse components of the magnetic field makes possible to provide good beam transmission in a multibeam system.
Some possibilities of the measuring of microwave characteristics of MMICpsilas and transistors on wafer are presented. The developed software gives opportunities to realize complicated scripts of measurements and testing.
Stability problems for X-band internally matched HEMTpsilas with output power higher than 10 W, associated gain higher than 13 dB are discussed. Several variants of schematic design for parasitic generation elimination are proposed.
Analytical and numerical results for dynamic temperature distribution in the semiconductor die operating in pulse mode are presented. A new type of flip-chip design is considered.
The increasing of IOTpsilas gain on 10-12 dB by using two-gap input cavity having unequal rf voltages is considered. The efficiency enhancing by using two-frequency operation in output cavity (class F) is simulated numerically. The opportunity of significant decrease of intermodulation products by low frequency predistortion is demonstrated.
Results of designing and simulating a multibeam klystrode for powering up of linear accelerators are presented. Because of a special design of the input cavity and operation in class C, the tube has a CW output power of 100 kW, efficiency of 80%, and a 30 dB gain at the frequency of 1300 MHz and 24 kV power supply voltage.
The results of thermal simulation of high power microwave transistor are presented. It is shown that the main part of thermal resistance is determined by GaAs crystal. The new design of the transistor and mounting technology are presented which allow to enhance transistor thermal resistance, to increase the chip thickness and decrease its dimensions.
The results of designing and simulation of multi-beam electron gun for high power tubes forming curvilinear beams turning at the angle 90deg. The gun contains 8 spherical cathodes oriented at the right angle to the axis of the tube. Turning of the beams and directing them to drift tubes (canals) are implemented by electrostatic field of the special reflecting electrode having decreased potential....
Prospects for the development of ultrashort pulse sources with ultra-high repetition frequency on the basis of vacuum tube technology are discussed. Predicted pulse spectrum exceeds a decade. These sources may be used for particle acceleration and in new radars.
Carbon cold cathodes are attractive for use in microwave tubes and many other applications due to their stability, low cost, and potential for high current operation in poor vacuum. Preliminary experiments have demonstrated current densities of 0.1-0.5 A/cm2 from emitters on flat substrates (silicon or molybdenum) having an area up to 1 cm2. However for microwave applications much greater current...
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