The twocavity klystron is the simplest klystron tube. Classification of the klystrons, mode of operation of the twocavity, multicavity and reflex klystrons. Archived from the original pdf on september 24, 2015. A novel feature of this design is a cavity which is simultaneously excited at two frequencies. A smallsignal theory of this oscillator is developed. The following figure depicts an example of multicavity klystron amplifier. The effect of space charge on bunching in a two cavity klystron. Other articles where twocavity klystron is discussed. Pdf theory and simulation of a twostage wband multiple. Microwave engineering cavity klystron tutorialspoint.
These will set up a field in the third cavity, which produces more concentrated bunches and so on. On this channel you can get education and knowledge for general issues and topics. The name of this klystron is taken due to its reflex act of electron beam. Figure 942 shows an applegate diagram for the 1 mode of a reflex klystron. Lecture on velocity modulationprocess in 2 cavity klystron. When used as an amplifier, the weak microwave signal to be amplified is applied to the buncher cavity through a coaxial cable or waveguide, and the amplified signal is extracted from the catcher cavity. On each side of the cavity hole is a grid that the electrons pass through. A grid is placed in the middle of these cavities to allow the electrons to flow. The magnetic field is only used to focalize the electron beam. With the signal applied in the first cavity, we get weak bunches in the second cavity. Download scientific diagram two cavity klystron geometry.
A klystron has one or more special cavities around the axis of the tube that modulate the electric field. The velocities of electrons emitted from the cathode are modulated to produce a densitymodulated electron beam. Lowfrequency klystron for accelerator applications. Between the cavities around the glass envelope a magnet is used in order to keep the electron beam in the center and in concentrated form at the end inside the glass envelope. The larger klystrons, with more than two resonant cavities, develop much higher gain and operate with greater efficiency.
Two cavity klystron amplifiers working, amplification and applegate diagram by engineering funda duration. What is a klystron amplifier, types, differences and their. There is anode used to attract the electrons emitted from the cathode. Pdf the effect of space charge on bunching in a two. A klystron amplifier uses different cavities which control the electric field around the axis of the tube. Klystron 9 interactive radar tampa weather bay news 9. The analysis of a reflex klystron is similar to that of a two cavity. Klystron multi cavity klystron, reflex klystron, working. A reflex klystron is an obsolete type in which the electron beam was reflected back along.
Complex dynamics of a two cavity klystron oscillator with delayed feedback. We present the results of theoretical analysis and numerical simulation of a two stage multiple cavity klystron oscillator in w band. Description of special versions of modern klystron tubes. Check spectrum bay news 9 s klystron 9 interactive radar to get detailed, streetlevel conditions for the tampa bay area. In the case of the twocavity klystron, the electron beam passes through a central hole in the first toroidshaped cavity and through a similar second cavity, terminating at the collector. Amplification of such twocavity klystron is low and hence multicavity klystrons are used. A klystron is a specialized linearbeam vacuum tube, invented in 1937 by american electrical. Pdf complex dynamics of a twocavity klystron oscillator. Pdf a twostage oscillator consisting of two coupled three cavity klystrons is studied.
Pdf lowfrequency klystron for accelerator applications. Due to the number of the resonant cavities, klystrons are divided up into twocavity klystrons, multicavity klystrons, and repeller klystrons. In this tube there are two microwave cavity resonators, the catcher and the buncher. This klystron is totally dissimilar from cavity klystron because it has a single cavity and used for modulation otherwise demodulation.
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