Abstract
Klystron is vacuum electron device operating in microwave range of frequencies. It is used as power amplifier in a variety of systems including radars, particle accelerators and thermonuclear reactors. A precise simulation of beam wave interaction in klystron is useful not only to understand its operation but also in development of tube with minimum iterations in fabrication. In the present case standard design codes like POISSON'S SUPERFISH, AJDISK and MAGIC 2D have been used to estimate and optimize different design parameters of klystron for desired tube performance. The paper presents the results of RF-section simulation of 250 kW CW C-band klystron with specifications as given in Table 1.
Highlights
RF section has been désigned for interaction between electron beam from electron gun and modulating signal coming from input cavity of the klystron
The RF interaction structure essentially consists of a series of reentrant cavity resonators connected together with metallic pipes called drift tubes
RF cavity of 5GHz is designed by varying its radius to optimized resonant frequency and R/Q value of input and output cavities
Summary
RF section has been désigned for interaction between electron beam from electron gun and modulating signal coming from input cavity of the klystron. The RF-section consists of two main parts: Resonant Cavities. The input and the output are taken from the tube via the resonant cavities. The exchange of energy between accelerated electron beam and RF signal takes place at the gap of cavity. The RF interaction structure essentially consists of a series of reentrant cavity resonators connected together with metallic pipes called drift tubes. Drift tube is the space between two successive cavities. In the drift length the electrons group into bunches after undergoing a change in velocity while passing through the cavity gap
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