The invention relates to microwave measurement technology and can be used to measure the dispersion characteristics of traveling wave tubes (TWT) from the plasma filling the transit channel. The technical problem to be solved by the claimed utility model is directed, is to increase the accuracy of measurement of the dispersion characteristics of the TWT Plasma filling transit channel, reliability of the custom TWT measurement according the dispersion characteristics of the TWT by the longitudinal magnetic field, an increase in the bandwidth adjustable TWT stated technical problem is solved in that the device for measuring the dispersion characteristics of the retardation layout structure of a traveling wave tube Plasma filling transit channel comprising layout retardation structure, a gas-discharge plasma source connected to the DC power supply, input and output devices of the microwave energy, the apparatus for measuring the dispersion characteristics, a device for measuring the plasma concentration of the positive column, according to the proposed utility model, and is provided with a magnet system in which the layout retardation structure is placed. When this magnet system can be configured as a solenoid connected to the DC power source. The apparatus provides increased accuracy of measurement of the dispersion characteristics of the TWT Plasma filling transit channel, measuring the dispersion characteristics of the TWT depending on the longitudinal magnetic field, which can significantly increase the reliability of the custom TWT and maim bandwidth adjustable TWT
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