Measurement and Behavior Analysis of Beam Current Modulation in a Virtual Cathode Oscillator

Modulation and amplitude of transmitted electron beam current in a virtual cathode oscillator have been measured by using two beam detectors, large detector and small detector. The objective is to understand the mechanism of microwave oscillation in a virtual cathode oscillator. The large detector has given us information about amplitude of the transmitted beam current from which the condition of virtual cathode formation has been obtained. The small detector has been used to measure the current modulation in the transmitted electron beam. The results have provided direct evidence of the virtual cathode existence and oscillation. The time–frequency behavior of the beam modulation has matched with that of the output microwave.

[1]  V. Tarakanov,et al.  PIC Simulation of the High-Power Microwave Radiation in a Radial-Type Reflex Triode With a Converging Magnetized Electron Beam , 2020, IEEE Transactions on Plasma Science.

[2]  C. Kasmi,et al.  On the Power Limits of an Axially Extracted Virtual Cathode Oscillator , 2020, IEEE Transactions on Plasma Science.

[3]  S. Berber,et al.  Performances of Velvet Cathodes With Different Geometries in a Reflex Triode Vircator , 2020, IEEE Transactions on Plasma Science.

[4]  V. V. Voronin,et al.  Key Ideas and Main Milestones of Research and Development of Microwave Generators With Virtual Cathode in RFNC-VNIIEF , 2020, IEEE Transactions on Plasma Science.

[5]  V. Tsarev,et al.  Hybrid High-Power Multiple-Beam Generator With Double-Gap Coupling Resonator System , 2020, IEEE Transactions on Electron Devices.

[6]  K. Sakurai,et al.  High-Power Microwave Generation by Double-Anode Virtual Cathode Oscillator , 2019, 2019 IEEE Pulsed Power & Plasma Science (PPPS).

[7]  F. Vega,et al.  On the virtual cathode oscillator’s energy optimization , 2018, AIP Advances.

[8]  E. Choi,et al.  Enhancing the power of high power microwaves by using zone plate and investigations for the position of virtual cathode inside the drift tube , 2018, Physics of Plasmas.

[9]  N. Frolov,et al.  High-efficiency virtual cathode oscillator with photonic crystal , 2018, Applied Physics Letters.

[10]  V. Baryshevsky,et al.  Experimental Study of a Triode Reflex Geometry Vircator , 2016, IEEE Transactions on Plasma Science.

[11]  V. Tarakanov,et al.  PIC Simulation of the Dynamics of Electrons in a Conical Vircator , 2016, IEEE Transactions on Plasma Science.

[12]  A. Hramov,et al.  Effect of self-magnetic fields on the nonlinear dynamics of relativistic electron beam with virtual cathode , 2012, 1302.4044.

[13]  Weihua Jiang.  Time–Frequency Analysis of Virtual-Cathode Oscillator , 2009, IEEE Transactions on Plasma Science.

[14]  J. Walter,et al.  Performance of a compact triode vircator and Marx generator system , 2009, 2009 IEEE Pulsed Power Conference.

[15]  R. Menon,et al.  HIGH POWER MICROWAVE GENERATION FROM COAXIAL VIRTUAL CATHODE OSCILLATOR , 2007 .

[16]  Robert J. Barker,et al.  Pulsed power-driven high-power microwave sources , 2004, Proceedings of the IEEE.

[17]  K. Yatsui,et al.  Experimental and simulation studies of new configuration of virtual cathode oscillator , 2004, IEEE Transactions on Plasma Science.

[18]  Dan Masse,et al.  High-Power Microwave Sources and Technologies , 2003 .

[19]  S. D. Korovin,et al.  A vircator with electron beam premodulation based on high-current repetitively pulsed accelerator , 2002 .

[20]  S. N. Volkov,et al.  S-band vircator with electron beam premodulation based on compact pulse driver with inductive energy storage , 2002 .

[21]  M. Kristiansen,et al.  Theory of the virtual cathode oscillator , 2001 .

[22]  A. Tokuchi,et al.  Repetitive pulsed-power generator "ETIGO-IV" , 2000, PPPS-2001 Pulsed Power Plasma Science 2001. 28th IEEE International Conference on Plasma Science and 13th IEEE International Pulsed Power Conference. Digest of Papers (Cat. No.01CH37251).

[23]  Robert J. Barker,et al.  High-power microwave sources and technologies , 2001 .

[24]  Steven H. Gold,et al.  Review of high-power microwave source research , 1997 .

[25]  K. Yatsui,et al.  Effect of longitudinal magnetic field on microwave efficiency of virtual cathode oscillator , 1996 .

[26]  Kiyoshi Yatsui,et al.  Mechanism of microwave generation by virtual cathode oscillation , 1995 .

[27]  R. F. Hoeberling,et al.  Advances in virtual cathode microwave sources , 1992 .