Experimental study of a W-band Gyroklystron amplifier operated in the high-order TE021 cavity mode

Multimode analysis of a W-band gyroklystron amplifier

“…shows the variation of output power and gain as a function of input signal power. It is observed that the maximum output power is obtained around 285 kW and gain around 22.2 dB corresponding to the values of Q 2 =130 and beam current I 0 =18.2A which are found to be in good agreement with the reported experimental results [10] and the time-independent single mode analysis. The nonlinear, time-dependent, multimode analysis of a three-cavity W-band gyroklystron amplifier operating in the TE 02 mode is presented to describe the multimode beam wave interaction behavior.…”

“…The present analysis produces peak output power around 330 kW in the desired TE 02 mode, electronic efficiency of 25 % at center frequency of 93.2 GHz, gain of around 22.8 dB with a 3dB bandwidth of around 0.19% for 75 kV, 17 A electron beam. The results obtained are validated with the reported experimental results [10] and the time-independent single mode analysis which are found to be in good aggrement within 10%.…”

Characteristics of Chaotic Regimes in a Space-distributed Gyroklystron Model with Delayed Feedback

“…Assume also that the weakly relativistic helical electron beam interacts in resonators with a wave at frequency ω close to cut-off frequency ω c and gyrofrequency ω H = eH 0 /mcγ 0 , where H 0 is the guiding magnetic field, c is the velocity of light, e and m are the charge and the mass of particles, respectively, and γ 0 is the initial relativistic mass factor of electrons. Excitation of input radiation and extraction of radiation from the output resonator are performed by diffraction, which corresponds to quite a number of experimentally realized systems [3,45,49]. To form a feedback loop, a part of output radiation with transmission coefficient R and delay time t 0 is entered to the amplifier input.…”

“…In what follows, we consider the dynamics of a two-cavity gyroklystron with an operating frequency of 93 GHz, which is experimentally investigated in [49]. We assume that the helical electron beam with pitch factor 1.3, injection radius 2.7 mm, energy 70 keV and current 15 A interacts with the mode T E 02 in the input and output resonators on the fundamental cyclotron harmonic.…”

PIC simulation study of a 35 GHz, 200 kW Gyroklystron

“…In the W band regime, a four-cavity gyroklystron amplifier producing 100 kW peak power and 10 kW average power at center frequency around 94 GHz with a bandwidth 700 MHz has been developed at the Naval Research Laboratory, USA for new high power radar named WARLOC [8]. Recently, Zasypkin et al at the Institute of Applied Physics, Russia reported the experimental results of a 93.2 GHz gyroklystron amplifier operating in TE 021 mode [9]. In this experiment, a peak output power of 340 kW with 27% efficiency, 23 dB saturated gain, and 0.41% (380 MHz) bandwidth was obtained using a 75 kV, 17 A electron beam [9].…”