A5010200861- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Pulsed Power Technology Applications
- Microwave Engineering and Waveguides
- Magnetic confinement fusion research
- Terahertz technology and applications
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Photonic and Optical Devices
- Acoustic Wave Resonator Technologies
- Advanced Fiber Laser Technologies
- Electromagnetic Simulation and Numerical Methods
- Microwave-Assisted Synthesis and Applications
- Laser-Matter Interactions and Applications
- Laser-Plasma Interactions and Diagnostics
- Plasma Diagnostics and Applications
- Superconducting and THz Device Technology
- Radio Frequency Integrated Circuit Design
- Geophysics and Sensor Technology
- Insects and Parasite Interactions
- Semiconductor Quantum Structures and Devices
- Photonic Crystals and Applications
- Laser Design and Applications
- Photorefractive and Nonlinear Optics
- Optical and Acousto-Optic Technologies
Institute of Applied Physics
2015-2024
Russian Academy of Sciences
2006-2024
A.M. Obukhov Institute of Atmospheric Physics
2010-2024
Plasma (Russia)
2017-2021
N. I. Lobachevsky State University of Nizhny Novgorod
2014-2018
Saratov State University
2015-2017
Yaroslav-the-Wise Novgorod State University
2015-2017
Karlsruhe Institute of Technology
2011
Nizhny Novgorod Commercial Institute
2008-2009
University of Stuttgart
2003-2005
In many tokamak and stellarator experiments around the globe that are investigating energy production via controlled thermonuclear fusion, electron cyclotron heating current drive (ECH&CD) used for plasma start-up, heating, non-inductive MHD stability control.ECH will be first auxiliary method on ITER.Megawatt-class, continuous wave (CW) gyrotrons employed as high-power millimeter (mm)-wave sources.The present review reports worldwide state-of-the-art of gyrotrons.Their successful...
First bandwidth measurements of a novel gyrotron amplifier are presented. The coupling between the second harmonic cyclotron mode gyrating electron beam and radiation field occurred in region near infinite phase velocity over broad by using cylindrical waveguide with helical corrugation on its internal surface. With energy 185 keV, achieved maximum output power 1.1 MW, saturated gain 37 dB, linear 47 8.4 to 10.4 GHz ( 21% relative bandwidth), an efficiency 29%, good agreement theory.
The results of experimental investigation two Ka-band gyrotron traveling-wave tube (gyro-TWT) amplifiers with helically corrugated waveguides are presented. first produces pulsed output power 130-160 kW within the frequency range 33.1-35.5 GHz and is capable operating a 10% duty factor. Reliability its major components in high average operation regime (about 10 kW) was proven continuous-wave (CW) experiment. second gyro-TWT amplifier delivered CW up to 7.7 -3-dB bandwidth 2.6 -1-dB 2.1 GHz....
The last decade has contributed to the rapid progress in gyrotron development. Megawatt-class, continuous wave gyrotrons are employed as high-power millimeter (mm)-wave sources for electron cyclotron heating (ECH) and current drive tokamaks stellarators. development pushes ECH from a minor major method. Also based technological complexes successfully applied resonance ion sources, microwave ceramic sintering diamond disk production. paper describes main features of high frequency gyrotrons....
This paper summarizes the results of experiments on electron cyclotron resonance heating (ECRH) plasma obtained at axially symmetric magnetic mirror device gas dynamic trap (GDT) (Budker Institute, Novosibirsk). The main achievement is demonstration discharges with extremely high temperatures bulk electrons. According to Thomson scattering measurements, on-axis temperature averaged over several sequential shots 660 ± 50 eV peak values exceeding 900 in a few shots. corresponds an least...
Abstract Many state-of-the-art fundamental and industrial projects need the use of terahertz radiation with high power small linewidth. Gyrotrons as sources provide desired level in sub-THz THz frequency range, but have substantial free-running fluctuations order 10 −4 . Here, we demonstrate that precise stability a high-power gyrotron can be achieved by phase-lock loop anode voltage control. The relative width spectrum obtained for 0.263 THz/100 W are 4 × −12 −10 , respectively, these...
A 250 GHz continuous-wave (CW) gyrotron has been developed at the IAP RAS jointly with GYCOM Ltd., as a prototype of microwave source for envisaged prospective nuclear fusion power plants (DEMO). The main applications such tube are electron cyclotron resonance heating and current drive magnetically confined plasma well its diagnostics based on collective Thomson scattering in various reactors controlled thermonuclear (e.g., tokamaks stellarators). results preliminary experimental tests...
Experimental details are discussed and millimeter wave measurements presented of a W-band gyrotron traveling-wave tube (gyro-TWT) that uses helically corrugated interaction waveguide operating at the second electron cyclotron harmonic. A method for increasing gain by using an circuit with two sections separated long sub-cutoff drift section has been experimentally verified. 10-mW driving source was sufficient to enable amplified signal output power 3 kWs. The continuous-wave (CW) operation...
A 20 kW gyrotron-driver has been used to control the RF generation of a 170 GHz/1 MW ITER prototype gyrotron. The frequency-locked operation regime obtained, accompanied by an increase in power and efficiency as well stabilization frequency slave MW-level tube.
A helically corrugated waveguide was used for a gyrotron backward-wave oscillator (gyro-BWO) experiment. thermionic cathode to produce an electron beam of 90-215 keV in energy, 2-3 current, and pitch alpha up 1.6. The achieved high-efficiency frequency-tunable operation. At fixed voltage 185 kV current 2 A, the output frequency tuned by adjusting magnetic field interaction cavity. maximum power 62 kW 3-dB frequency-tuning band 8.0-9.5 GHz (17% relative tuning range) with electronic...
The paper presents the latest development achievements in Russian institutions IAP/GYCOM of MW power level gyrotrons for fusion installations.
A gyrotron backward wave oscillator (gyro-BWO) with a helically corrugated interaction waveguide demonstrated its potential as powerful microwave source high efficiency and wide frequency tuning range. This letter presents the theory describing dispersion properties of such linear beam-wave interaction. Numerical simulation results using PIC code MAGIC were found to be in excellent agreement output measured from gyro-BWO experiment.
Helically corrugated waveguides have recently been studied for use in various applications such as interaction regions gyrotron traveling-wave tubes and backward-wave oscillators a dispersive medium passive microwave pulse compression. The paper presents summary of methods that can be used analysis the wave dispersion waveguides. results obtained from an analytical approach, simulations with three-dimensional numerical code MAGIC, cold measurements are analyzed compared.
Currently, a new multi-frequency ECRH system is under construction at the ASDEX Upgrade tokamak experiment. This employs, for first time in fusion device, gyrotrons, step-tunable range 105–140 GHz. The two working 105 and 140 GHz, were installed tested. matching optics unit includes set of phase correcting mirrors each frequency as well pair broadband polarizer mirrors. transmission line consists non-evacuated corrugated HE 11 waveguides with an inner diameter (ID) 87 mm has total length...
In order to realize a high-power (100 s of kilowatts at the W-band) wideband microwave amplifier, we suggest use cascade two gyrotron traveling-wave tubes (gyro-TWTs), one which possesses relatively high gain (40-50 dB) while other provides output power moderate (15-20 gain. Both gyro-TWTs are assumed helically corrugated waveguides and operate second cyclotron harmonic. A principal scheme such an amplifier chain is discussed, including issues on input, output, transmission between tubes....
We propose a robust way of advancement the gyrotrons into region terahertz frequencies and MW-level power radiation while retaining high efficiency stability frequency. These may be used for electron cyclotron resonance heating current drive systems (ECRH&CD) in future fusion setups, large complexes coherently radiating THz data energy transmission, particles acceleration. at first demonstrate advantages this example gyrotron with very-high-order operating mode TE56.24, driven by relatively...
Electronic efficiency close to the value calculated for a perfect electron beam in type of free-electron maser based on stimulated cyclotron radiation has been obtained first time. The cyclotron-autoresonance-maser oscillator utilizing 500 kV, 100 A with rotational velocity $0.55c$ yielded coherent at 7.9 mm wavelength power 13 MW. corresponding electronic was 26%.
Reflectometry with wavelengths in the centimetre to millimetre-wave range will be used ITER measure density profile main plasma and divertor regions position shape order provide a reference for magnetic diagnostics long pulses. In addition, it is expected key information measurement of fluctuations. A set reflectometers meet relevant requirements has been included its present outline as part design since 2001 being adapted baseline accommodate progress reflectometry techniques capabilities....