Investigation of the possibility of increasing the resistance to self-excitation of a traveling wave lamp with a retarding system such as a chain of coupled resonators.

Abstract

Among the various types of traveling wave tube, single-section TWTs are of particular interest due to their simplicity and efficiency. However, in the course of solving the problem of obtaining a high level of output power at a relatively high gain in a wide frequency band, the tendency of a single-section TWT with a homogeneous decelerating structure to self-excitation at the bandwidth boundary of the slit mode of the decelerating system was revealed. To improve the characteristics, it is necessary to have a deep understanding of the processes occurring inside the TWT, in particular, the mechanism of self-excitation. To maintain a stable mode of operation of the TWT, stabilization mechanisms are necessary, such as adjusting the current of the electron gun or changing the parameters of the resonators of the TWT interaction space. The presence of self-excitation in the device can lead to undesirable fluctuations in the amplitude and frequency of the signal, which requires careful monitoring and regulation.
In order to increase the resistance to self-excitation, the dispersion characteristics of two sections of the decelerating system with approximately the same deceleration in the main bandwidth with the separation of the boundary frequencies of slit modes were calculated using modern CST Microwave Studio software, according to the results of calculations, a mock-up of a LBV with an inhomogeneous decelerating system was made and studied to experimentally verify the possibility of increasing the resistance to self-excitation of TWT.

Speaker

Nikita Vadimovich Rzhevin
SC NPP Almaz
Russia

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