The effect of an external signal on output microwave power of a low-voltage vircator

Amplification through chaotic synchronization in spatially extended beam-plasma systems

“…10,12 As it has been mentioned above, the amplification of the response vircator output power is related to the rising of the charged particle bunching efficiency while propagating through the drift space. The same amplification mechanism has been shown in the previous work 38 where we have investigated theoretically and experimentally the dynamics of the low-voltage vircator driven by the external harmonic signal. It is well known that the velocity modulation of the electron beam leads to the formation of electron bunches in the drift space.…”

“…Such an effect does not depend on the characteristics of the response system, i.e., it is observed both in the case of the interaction between two chaotic vircators and in the case of the influence of the chaotic signal to lowvoltage vircator being in the periodic regime. It worth noting that in the early work 38 the similar effect of the output microwave power gain under the external signal action has been confirmed experimentally. In that case, the external harmonic signal has also been introduced to the response system as the preliminary velocity modulation of the electron beam at the entrance of the drift space.…”

Исследование И Оптимизация Характеристик Генерации Сверхмощного Виртода

“…Приборы на виртуальном катоде (такие как виркатор, редитрон, виртод и др.) представляют особый класс СВЧ-генераторов и усилителей тормозного излучения, работа которых основана на формировании виртуального катода (ВК) в электронном потоке (обычно релятивистском) со сверхкритическим током [1,3,5,[17][18][19][20]. Интерес к подобным генераторам обусловлен их преимуществами: очень высокая выходная мощность СВЧ-излучения, простота конструкции (в частности, виркаторы могут работать без внешнего фокусирующего магнитного поля), быстрый старт генерации, возможность простой настройки частоты и переключения режимов, низкие требования к качеству электронного потока [1,6,8,21,22].…”

High-efficiency virtual cathode oscillator with photonic crystal

“…7,[12][13][14][15][16] Vircators are known to be a rather simple way to extract electromagnetic energy from relativistic electron beams (REBs) and to generate microwaves, providing high-power radiation up to a gigawatt output peak power level, or to amplify powerful microwave signals. [16][17][18][19][20][21][22] Along with advantages of VCOs such as high output power, construction simplicity, and capability to operate without application of the external magnetic field, one of the weakest points of vircators is low generation efficiency (0.1%-10%). 7,14,[23][24][25] In basic VCO configurations, this issue is related to low efficiency of microwave output systems or poor bunching of electrons in the VC area.…”