Powerful wideband amplifier based on hybrid plasma-cavity slow-wave structure

Advances in plasma-filled microwave sources

“…Researchers at the all-Russian Electrotechnical Institute ͑VEI͒ in Moscow report 12 an increased bandwidth of their coupled cavity ͑CCC͒ TWT, which they attribute to plasma filling of the coupling cavity gaps. In this case, the beam-produced plasma diffuses into the cavity gaps, which …”

“…Another effect that increases the efficiency of microwave sources that utilize slow wave structures is the generation of hybrid modes. 12,13 These modes result from the coupling of slow plasma waves generated in the beam-plasma system with the slow electromagnetic structure waves. This coupling results in a finite real transverse wave number to exist for the hybrid wave, 1,13 which causes the transverse structure of the wave in cylindrical systems to be described by ordinary Bessel functions which can have a significant magnitude on axis.…”

Bipolar diodes with divergent electron beam

“…The gain and perveance are given by (9) Table 1 presents recalculated gains K e for a bipolar spherical diode with divergent electron beam. It is seen that gain K e of electron current monotonically decreases from 1.86 for a plane diode and tends to unity when the anode radius increases.…”

“…The first tendency is related to the application of plasma structures in the devices of classical vacuum electronics that work in the steady state or pulsed regimes. The development of a beam-plasma micro wave amplifier (plasma TWT) based on a hybrid slow wave structure that represents a chain of coupled reso nators with plasma filled drift channel [9] may serve as α an example. The experimental results prove the possi bility of the application of bipolar electron-optical systems in the beam-plasma microwave devices [10].…”

Using magnetron-injection guns for beam-plasma microwave tubes

“…The creation ofplasma TWT has demanded the solution ofa number ofphysical-technical problems. There are the design of electron beam (20 keV, 3 A) formation and transportation system in long narrow plasma-filled channel of hybrid slow-wave structure (diameter I .2 cm, length 40 cm); the design for gas-plasma-filled microwave device as sealed tube the gas-dynamic system which guarantees work gas pressure regulation in needed limits (1O&10 Torr) with help ofH2-generators and has the original build-in tube pumping system attached to electron gun: the design ofmicrowave power output system.The peculiarities and characteristics ofsuch devices are described in [1][2][3][4][5][6][7]. …”