SU752552A1 - Method of determining electrodynamic parameters of delay systems - Google Patents

Description

This is due to the fact that the beam current is chosen to correspond to the working mode of the TWT, the range of variation of the electron amplification coefficient in the attenuation region is exceeded, the accelerating voltage varies, the several values of the electron amplification coefficient in this region are measured and measured, including the vicinity of the minimum electron gain (maximum attenuations) and measured by two different voltages corresponding to each magnitude of the gain.

This sequence of operations allows one to rather simply obtain the experimental dependence of the electron attenuation coefficient on the accelerating voltage, and at the same time determine the three main electrodynamic parameters of the ES.

The invention is illustrated in the drawings. FIG. Figure 1 shows the experimental and theoretical dependences of the electron gain factor / (on the accelerating voltage f / o; Fig. 2 is a block diagram of a measurement setup that was used to implement the proposed measurement probe.

The installation contains a standard microwave generator (GSS) 1, floating attenuators 2, 3, detector chambers 4, 5, amplifier 6, oscilloscope 7, transparent TWT with power supply 8, voltmeter 9.

To determine the coupling resistance, deceleration ratio, and distributed losses of the studied CS, it is necessary to remove a part of the dependence of K on UQ using the electron beam of the transparent TWT or the electron probe. At the same time, this dependence, in order to reduce the measurement error due to the presence of reflections in the path of the studied ES, is best taken in the electronic attenuation region (Fig. 1). Then, using the linear theory of the TWT, which allows calculating the dependence of K on L / 0 at various electrodynamic and geometric parameters of the ZP, as well as the electrical and geometric parameters of the electron beam participating in the interaction, to achieve a coincidence of the theoretical and experimental dependence of K on Uo, in the region of maximum fading out.

The representation in FIG. 2, the measurement setup includes only standard instrumentation and can be used to measure the ES electrodynamic parameters in any part of the microwave range.

The measurement is enhanced as follows.

Attenuator 3 (FIG. 2) is set to the position corresponding to the minimum attenuation. Using attenuator 2 at the selected frequency of the GSS 1 signal, a balance is achieved in the absence of an electron beam 8. The electron 1 beam is turned on and the beam current (/ p) is set close to the TWT operating mode. With this current of the electronic device, the voltage Uo is measured by the maximum electronic attenuation coefficient using attenuator 2, and thus the range of variation of the electronic attenuation coefficient is determined. Then, the electron beam is turned off and the balance is again performed using attenuator 2. Next, we start measuring the dependence of / (on UQ (Fig. 1)).

Attenuator 3 is set to the attenuation value equal to K. (Fig. 1), turn on the knob and set the beam current to be equal to / p. Changing the accelerating voltage with the help of an ABV power supply unit, a voltmeter 9 measures voltages Ui and Ui (Fig. 1), corresponding to the electronic decay -Ki. Then, attenuator 3 is used to set the attenuation equal to -Kz, and the measurement process is repeated. Thus, -Ki, Hi, Ui, -Kg, Uz, Uz are successively measured; -Ks, Us, Us, etc., are obtained from the dependence of the electronic attenuation coefficient on the accelerating voltage and the maximum electronic attenuation coefficient. To determine the desired parameters of the CS, 4, 6 experimental points / С from UQ are sufficient. Further, using a linear theory of the TWT, a computer determines the theoretical dependence of / C on UQ, corresponding to the experimental value, and by calculating the connection resistance, retardation factor, and distributed losses of the ES, by calculations.

The use of the proposed method for measuring electrodiamiamic delay systems for ESP systems provides, but compares with the existing methods, the following advantages:

ensuring the simultaneous measurement of three basic electrodynamic parameters of the ES and, consequently, a decrease in the error or simplification of measurements; measurement of distributed losses of the ES, which do not include the transient attenuation of the microwave signal, due to the conclusions of the energy of the ES, which is especially important for the study of the ES of the shortwave part of the microwave range; measuring the resistance of a CS connection, taking into account the geometrical dimensions of the real electronic nuchion TWT and its location in the interaction space.

The use of the invention allows to reduce the time and improve the accuracy of determining the parameters of the decelerating systems.

Claims (1)

Invention Formula The method of determining the electrodynamic parameters of decelerating systems, based on the use of the interaction of an electron beam with an electromagnetic 3 wave, characteristic of a traveling lamp :; :: rO; aio; u: m select current i; --Jsa, 1.; -.,:. And: .L of the electron coefficient of the amplification of the wave in the system and of the accelerating nanometer, and the calculation of the parameters, are distinguished, and so that, in order to reduce the error while simplifying the measurement process, By providing a simultaneous determination of the deceleration ratio, coupling resistance and distributed loss, the beam current is chosen according to the lamp's operating mode, the range of variation of the electronic gain is determined in the attenuation region, the accelerating voltage is varied, at least four masks electronic gain coefficient in the art, including electronic neighborhood minimum gain, and is measured but two different voltage corresponding to each value of the gain. Electronic amplification Theorie SKcnepuMBHfn