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A three dimensional particle-in-cell (PIC) code, MAGIC3D, is used to examine eigenmode analysis of 2.5 MW S-band pulse tunable magnetron, using hole and slot type resonator with ring strap. Magnetron is invariably operated in pi mode which is being most efficient out of all the possible modes and nondegenerate in nature. So the mode separation between pi mode and adjacent mode is important aspect...
In view of the trend in and requirement of microwave tubes, it is necessary to identify areas and involve academia in research and development with national laboratories and industries through sponsored projects. All concerned in the community established academic institutions, national laboratories, industries, and users must exploit the huge potential in large number of engineering college students...
The paper presents design, analysis and electromagnetic simulation of asymmetric structure of pillbox type RF window for S-band high power applications. This study is motivated by 6 MW pulse peak and 24 kW average power S band klystron project. Asymmetrical pill box type RF window structure is a new approach for matching reduced waveguide in one side of the window. The simulated results are well matched...
In multi-beam Klystron (MBK),several electron beams are used to interact with the r.f. signal in a single interaction structure. MBK has a number of advantages over single beam klystron. As it uses several low perveance beams, for the same overall perveance, the beam voltage is substantially lower than single beam klystron for same DC input power. This leads to possible increase in pulse length, increased...
C-band, 60 W space TWT of overall efficiency of about 55% has been designed at CEERI for satellite communication system. As the efficiency achieved in this TWT is comparatively less, studies are being carried out to enhance the efficiency of this TWT by evaluating various parameters used for improving the efficiency. This paper present the analyses and studies of various parameters needed for the...
Microwave tubes cover the wide range of RF spectrum. Up to 30 GHz they are usually termed as microwave tubes and beyond that they are known as millimeter wave tubes. They are widely used for generation and amplification of RF signals. These devices came into prominence around World War - II when pulse magnetrons were substantially used in radar systems. Later on, other devices like klystron, backward...
Nonlinear theory of a backward wave oscillator (BWO) configuration of plasma assisted slow wave device (Pasotron) is developed. It is shown that the space charge effects in bunching the electrons in Pasotron are quiet different role than that of the linear-beam devices with strong magnetic field. A relation for the efficiency as a function of the radial electric field is derived and analyzes its dependence...
High power microwave tubes can generate power in MW level even at frequency above 100 GHz. These tubes are a necessity for various applications like high data rate ground and space communications, defence and civilian radars, linear accelerators, plasma heating, and e-bomb. Solid-state devices are not available to meet these objectives because of their power level in few watts. Some of the important...
Dielectric windows often limit the power handling capability of vacuum electron devices. It is necessary to choose the right dielectric material for high power applications. Depending upon the power level, a range of materials has been used in various systems. The ideal material should have high mechanical strength, high thermal conductivity, high electrical breakdown voltage, low dielectric loss,...
A dual anode convergent electron gun of perveance 0.14 mup has been designed for Ka-Band helix Traveling Wave Tube (TWT) which would ultimately have application in satellite communications. Gun has been designed using codes EGUN, TRAK & OMNITRAK. Pierce type electron gun with isolated beam forming electrode (BFE) & M-Type dispenser cathode with 3.1 mm button diameter has been opted. It consists...
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