A5091293664- Gyrotron and Vacuum Electronics Research
- Pulsed Power Technology Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Laser Design and Applications
- Terahertz technology and applications
- Electromagnetic Effects on Materials
- Electrostatic Discharge in Electronics
- Laser-Plasma Interactions and Diagnostics
- Plasma Applications and Diagnostics
- Microwave Engineering and Waveguides
- Plasma Diagnostics and Applications
- Vacuum and Plasma Arcs
- Advanced Optical Sensing Technologies
- Semiconductor Lasers and Optical Devices
- Laser Material Processing Techniques
- bioluminescence and chemiluminescence research
- Laser-Matter Interactions and Applications
- Full-Duplex Wireless Communications
- Magnetic properties of thin films
- Laser-induced spectroscopy and plasma
- Advanced MEMS and NEMS Technologies
- Luminescence Properties of Advanced Materials
- Advanced materials and composites
- Lightning and Electromagnetic Phenomena
Institute of Electrophysics
2015-2025
Moscow Engineering Physics Institute
2021
Russian Academy of Sciences
1999-2013
Institute of High Current Electronics
2004-2005
Institute of Applied Physics
1997-2002
University of Strathclyde
1999
Glasgow Life
1998
We demonstrate both theoretically and experimentally the possibility of correlating phase a Cherenkov superradiance (SR) pulse to sharp edge current pulse, when spontaneous emission electron bunch serves as seed for SR processes. By division driving voltage across several parallel channels equipped with independent cathodes we can synchronize sources arrange two-dimensional array. In experiments carried out, coherent summation radiation from four 8-mm wavelength band generators peak power...
We present and analyze characteristics of the runaway electron flow in a high-voltage (the voltage rise rate up to 1.5 MV/ns) air-filled electrode gap with strongly nonuniform electric field. It is demonstrated that such contains high-energy component duration not more than 10 ps. According numerical simulations, generation/termination governed by impact ionization gas near cathode switching on/off critical (sufficient for electrons run away) field at boundary expanding plasma. The...
Intense microwave pulses (several hundreds of kilowatts) ultrashort duration (less than 0.5 ns) were obtained from an ensemble electrons rotating in a uniform magnetic field. The comparison with theoretical simulations proves that this emission can be interpreted as cyclotron superradiance. maximum radiation power was achieved under group synchronism conditions, when the electron bunch translational velocity coincides wave propagating waveguide.
Experimental results of the observation coherent stimulated radiation from subnanosecond electron bunches moving through a periodic waveguide and interacting with backward propagating wave are presented. The microwave pulses in Ka W bands were generated repetition frequencies up to 25 Hz. mechanism pulse generation was associated self-bunching, mutual influence different parts due slippage respect electrons; this can be interpreted as superradiance. illumination panel neon bulbs resulted...
The synchronized operation of four gyromagnetic nonlinear transmission lines (NLTLs) was tested with a pulse repetition frequency up to 1 kHz during s bursts. High voltage pulses duration ∼5 ns from the solid state driver S-500 were split into 48 Ω channels reaching about -200 kV in each channel ∼10% variation amplitude. maximum peak at NLTL output within 220-235 modulation depth decaying oscillations 90% center near 2.1 GHz. relative delay between reached half-period oscillations....
The vacuum current associated with any type of electron emission for arbitrary configuration the diode depends on combination applied electric field and space charge (VSC) created by current. Such fundamental statement should give very close links between normalized cathode θ which has been introduced Forbes in 2008 planar diodes as a reduction surface field: = field-with/field-without VSC. This article reports universal approximation cos(πθ/2) that is ratio actual fully space-charge-limited...
A comprehensive analysis of the physical processes occurring in high-voltage nonlinear ferrite transmission lines microwave generation mode is presented. The coaxial type, based on rings with different combinations magnetic parameters and hysteresis loop shapes, have been investigated for this purpose. complex comparative dependence modes properties, length ring assembly, magnitude external bias field enables observed to be related properties spin waves. proposed new approaches make it...
Technical parameters of a CLAVI pulsed cathodoluminescence spectroscope are presented. The device is used for the nondestructive spectral luminescence analysis defects in solid optical and laser materials (crystals, glasses, ceramic materials). Illustrating examples
The theoretical premises and experimental results of phase control in high-power microwave oscillators with nanosecond pulse duration are presented. In experiments, two-channel backward wave (BWOs) for both steady state (100-150 cycles) super-radiance (SR) mode operation (10-20 discussed. For the control, shift moment fastest current rise is provided sections nonlinear transmission lines axially biased ferrites. voltage sharpening group velocity depend on dc axial magnetic field. SR mode,...
This paper presents the results of testing a high voltage pulse generator based on parallel gyromagnetic nonlinear transmission lines filled with saturable ferrite. The is capable producing almost identical stable rf-modulated nanosecond pulses in each two, or four, output channels. amplitude channel can reach −285 −180 kV, respectively, rf modulation depth up to 60%. Drive were produced as packets duration 1–5 s at repetition frequency 800 Hz using driver equipped all-solid-state switches....
Test results of high-voltage subnanosecond pulse generator with a hybrid, two-stage energy compression scheme are presented. After the first section gas discharger, ferrite-filled gyromagnetic nonlinear transmitting line is used. The offered technical solution makes it possible to increase voltage amplitude from -185 kV -325 kV, 2-ns rise time minimized down ∼180 ps. For small output -240 shortest front ∼85 ps was obtained. maximum utilized form an ultra-short flow runaway electrons in...
The generation modes of high-voltage microwave oscillations nonlinear coaxial transmission lines filled with NiZn ferrite rings an ordinary (smoothed) hysteresis loop and MgMn a rectangular are presented for comparison. Results across wide frequency range (∼5.5–12.7 GHz) demonstrated that the anisotropic magnetic properties provide much more stable effective powerful peak amplitudes up to −350 kV deep modulation in biasing field (∼4–85 kA/m), as well possibility mode without external field....
Testing results of a generator based on the parallel gyromagnetic nonlinear transmission lines with saturated ferrite are presented. Practically identical and stable RF-modulated high-voltage nanosecond pulses were shaped in each four channels. The pulse amplitude reaches −175 kV at modulation depth RF oscillations to 50% an effective frequency ~4 GHz. Power packet operation mode 1-s duration repetition frequencies up 1000 Hz (in packet) was supplied by solid-state driver. electric field...
For the first time, we demonstrate experimentally possibility of Cherenkov superradiant generation with a phase imposed by an ultrashort seed microwave pulse. The phases and initiated Ka-band pulses were correlated accuracy 0.5–0.7 rad for power ratio down to −35 dB. Characteristics such process determined in frame basic theoretical model that describes both spontaneous stimulated emission electron beam moving corrugated waveguides. obtained results open up opportunities reaching extremely...
This paper presents new experimental data that enable the observed processes in nonlinear ferrite lines to be related with theoretical positions of spin waves magnetization precession under conditions a high-power microwave. Such an approach has not been considered earlier discussions on subject and can contribute theory generation oscillations gyromagnetic medium. These aspects were used design type generator. The specific feature is presence regularity mode microwave oscillations....
Test results of high-voltage one- and four-channel radio-frequency (RF) generators based on the coaxial gyromagnetic ferrite-filled nonlinear transmission lines (NLTL) with external magnetic bias RF-modulation frequency a pulse envelope ∼8 GHz are presented. Electrical strength oil-isolated NLTLs was tested in compact version one-channel generator RADAN driver at repetition rate 100 pps. In case stationary setup, 5-ns -500 kV amplitude split into 4 channels individual NLTLs. Gyromagnetic...
Real-time investigations of the dynamics explosive electron emission from a high-voltage cathode holder made nonmagnetic stainless steel in magnetically insulated coaxial vacuum diode have been performed. It has shown that aging with several tens voltage pulses at field 1–2 MV/cm provides stray delay ranging hundreds picoseconds to nanosecond or more. In addition, magnetic must be configured so lines would not cross gap between case and region behind emitting edge cathode. These efforts...
Nonlinear gyromagnetic coaxial lines with saturated ferrite rings of different types have been tested. The test results showed that microwave (mw) ferrites, low losses at high frequencies, can improve the parameters output mw oscillations. line assembly a spinel structure provided maximum increase in leading peak amplitude by <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\sim $...
This paper describes two approaches which have been developed in the past few years for creation of electronically controlled steering microwave beam formed by multichannel auto-oscillators. The first one is based on two- and four-channel gyromagnetic nonlinear transmission lines operating generation mode at subgigawatts power level decimeter wavelengths. second approach uses Cherenkov superradiance four parallel backward-wave oscillators with centimeter We present results several recent...