Feedback Suppression in the Plasma Relativistic Microwave Noise Amplifier with Inverse Configuration
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IED PHYSICS
Feedback Suppression in the Plasma Relativistic Microwave Noise Amplifier with Inverse Configuration A. V. Ponomareva, A. B. Buleykob, c, and D. K. Ul’yanova, * a
Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, 119991 Russia b Troitsk Institute for Innovation and Fusion Research, Troitsk, Moscow, 108840 Russia c Peoples’ Friendship University of Russia (RUDN), Moscow, 117198 Russia *e-mail: [email protected] Received October 1, 2019; revised October 1, 2019; accepted October 1, 2019
Abstract—The noise amplification mode in a plasma maser with inverse geometry was obtained experimentally for the first time. It is shown that the introduction of a microwave absorber transfers the maser operating mode from the oscillator to the amplifier. In both modes, the tuning of the radiation frequency has been shown when the plasma density changes. This work is a step in the implementation of a plasma relativistic noise amplifier with a short REB pulse. Keywords: high-power microwave generator, plasma maser, high-current relativistic electron beam, REB, wideband DOI: 10.1134/S1063780X2009007X
INTRODUCTION Plasma relativistic microwave generators and amplifiers (plasma masers) are based on the interaction of a tubular plasma with a tubular high-current relativistic electron beam (REB) [1]. In the majority of plasma masers, the electron beam propagates inside the tubular plasma, since such a geometry makes it relatively easy to form a plasma without the threat of plasma entering the diode forming REB. Such geometry was used in plasma microwave generators (plasma masers, plasma relativistic generators, PRG). The very first of these was the PRG in [2]. The unique results on controlling the frequency of microwave radiation pulses with a power of 50 MW were obtained on the PRG with such a REB location. A 7-fold electronic tuning of the radiation frequency from pulse to pulse [3], and during one pulse [4, 5] with the change in the average frequency of the microwave radiation spectrum by up to 1.5 GHz in 50 ns, a narrow and wide radiation spectrum [6], generation of microwave pulses with a frequency of 50 Hz and with a 4-fold tuning of the radiation frequency [7] were demonstrated. The noise amplification at the plasma location outside the REB was studied in [8, 9]. Due to the specific structure of the plasma wave, the output of plasma maser radiation is carried out only by a coaxial waveguide, the central electrode of which is a “continuation” of tubular plasma of approximately the same diameter. The electron beam propagating inside the plasma is deposited on this electrode (collector), which is overheated, releases gas
and significantly disrupts the process of the plasma formation with the parameters necessary for the operation of the maser. To suppress such a process, it is necessary to use a hollow collector of a complex shape with an additional strong magnetic field and additional high-vacuum pumping [7] that increases the complexity and power consumption of the device, reducing the re
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