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Tunable vircators with E-beam premodulation
By: Kitsanov, S.A.; Korovin, S.D.; Tarakanov, V.P.; Rostov, V.V.; Klimov, A.I.; Polevin, S.D.; Pegel, I.V.; Kurkan, I.K.;
2001 / IEEE / 0-7803-7141-0
Description
This item was taken from the IEEE Conference ' Tunable vircators with E-beam premodulation ' Summary form only given, as follows. Presents recent results of theoretical and experimental studies of HPM production in virtual cathode systems with electron beam premodulation. The phase separation of electron current in these devices is due to strong energy dependence of electron current passage just above the critical current level and develops at distances on the range of the wave length or shorter. Thus, the generator is efficient even with its self length is not over the wavelength where the kinematic bunching is inefficient. This provides working capacity of the device without external magnetic field. In theory, conditions for electromagnetic wave excitation in single- or double-gap vircator systems are anal, zed. Optimum amplitudes and phasing of RF fields in the gaps and the corresponding maximum microwave efficiencies are estimated in theory, supported with 1D-3D PIC simulations. The efficiency of double-gap system was found to multiply exceed the efficiency of single-gap system. The maximum efficiency for a double-gap system demonstrated in 3D electromagnetic simulation with KARAT code approached 20% at gigawatt power level. Experiments were performed using high-current periodically-pulsed electron accelerator SINUS-7 (pulse width 50 ns, maximum 2 MeV, 20 kA). L-band and S-band vircator systems were produced with output power of up to 1 GW and efficiency of up to 6% at 20-30 ns microwave pulse pulse width. The range for continuous frequency tuning reached 15% at half power level. Batch regime of periodically-pulsed operation of the vircator was realized (batch length 1 sec at 50 p.p.s. or 20 sec at 20 p.p.s.).
Related Topics
Electron-beam Premodulation
Theoretical Studies
Experimental Studies
Hpm Production
Virtual Cathode Systems
Electron Beam Premodulation
Phase Separation
Electron Current
Energy Dependence
Electron Current Passage
Critical Current Level
Distances
Wave Length
Self Length
Electromagnetic Wave Excitation
Double-gap Vircator Systems
Single-gap Vircator Systems
Optimum Amplitudes
Phasing
Rf Fields
Maximum Microwave Efficiencies
1d-3d Pic Simulations
Double-gap System
Single-gap System
Efficiency
Maximum Efficiency
3d Electromagnetic Simulation
Karat Code
20 Percent
2 Mev
20 Ka
50 Ns
1 Gw
6 Percent
Space Vector Pulse Width Modulation
Production Systems
Cathodes
Electron Beams
Critical Current
Kinematics
Magnetic Fields
Electromagnetic Scattering
Radio Frequency
Microwave Devices
Tunable Vircators
20 To 30 Ns
Particle Beam Bunching
Electron Beams
Tuning
Microwave Generation
Vircators
Uhf Tubes
Engineering
Kinematic Bunching