A5070489377- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Particle Accelerators and Free-Electron Lasers
- Microwave Engineering and Waveguides
- Pulsed Power Technology Applications
- Photonic and Optical Devices
- Terahertz technology and applications
- Coal Properties and Utilization
- Ion-surface interactions and analysis
- Geotechnical and Geomechanical Engineering
- Photonic Crystals and Applications
- Mining and Gasification Technologies
- Superconducting Materials and Applications
- Advanced Antenna and Metasurface Technologies
- Nuclear Physics and Applications
- Magneto-Optical Properties and Applications
- Plasma Diagnostics and Applications
- Photorefractive and Nonlinear Optics
- Electron and X-Ray Spectroscopy Techniques
- Laser-induced spectroscopy and plasma
- Analytical chemistry methods development
- Geological and Geochemical Analysis
- Atomic and Subatomic Physics Research
- Geophysics and Sensor Technology
Institute of Applied Physics
2013-2024
Russian Academy of Sciences
2003-2024
A.M. Obukhov Institute of Atmospheric Physics
2011-2023
Nuclear Safety Institute
2015
Moscow Engineering Physics Institute
2013
Geophysical Survey
2007
Mineral Resources
2002
Kurchatov Institute
1995
National Academy of Sciences of Belarus
1995
Institute of the Earth’s Crust
1983
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.
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....
We discovered a specific property of the eigenmodes cylindrical waveguide, due to which efficient mode excitation at ultrahigh ($s=4n+1,$ $n$ is integer) multiples gyrofrequency can be provided by polyhelical weakly relativistic electron beam, standardly used for gyrotron operation. In proof-of-principle experiment with V-band driven 25-keV, 2-A about 100 mW radiation power fifth cyclotron harmonic (0.22 THz) has been detected in cw regime. Based on theory, we demonstrate simulations that,...
RF systems in the ion cyclotron resonance frequency (ICRF) range and electron (ECRF) are an advanced stage of commissioning, to carry out pre-ionization, breakdown, heating current drive experiments on steady-state superconducting tokamak SST-1. Initially 1.5 MW continuous wave ICRF system would be used heat SST-1 plasma 1.0 keV during a pulse length 1000 s. For different scenarios at 3.0 T, wide band operating frequencies (20–92 MHz) is required. To meet this requirement two CW rf...
Results are presented for measurements of microwave power the Borets-75/0.8 gyrotron with recovery residual electron energy, which were performed by a flow-type calorimeter. This is part ECR plasma heating complex put into operation in 2010 at L-2M stellarator. The new calorimeter capable measuring up to 0.5 MW. Monitoring makes it possible control parameters supply unit (its voltage and current) magnetic field cryomagnet order optimize arrive maximum efficiency.
We study variations in the dielectric properties of a semi-insulating GaAs wafer under millisecond pulses extreme subterahertz power density up to 180 kW/mm2 at 263 GHz. Increasing duration and pulse, we have obtained sequential down- upshifts within range more than two orders effective loss tangent experiments. observed existence an optimal regime irradiation, which accurate, simple selective annealing from 300 nanometer-thick surface layer oxides is achieved, even plain air, without damage...
Results of the electron cyclotron current drive experiment at second harmonic resonance on T-10 tokamak are presented. High frequency (HF) power up to 1.2 MW was launched from low field side. A maximum driven 35 kA and efficiency ηCD = 0.05 A/W an temperature Tc(O) 4 keV a density nc(0) 1 × 1013 cm-3 were obtained. For HF power, less than predicted by linear theory unless effect elliptical polarization non-perpendicular injection is considered, in which case close theoretical value. The...
A multi-frequency gyrotron equipped with a circular Brewster window made on the base of high-temperature-brazed ceramic disc was tested. Efficient operation at 11 modes (frequencies) in range 105 GHz -143 demonstrated. Gyrotron output power (0.8 MW/0.1 sec) limited by used supply. The scheme and test results are design long-pulse CVD diamond window.
The 42-GHz electron cyclotron resonance heating (ECRH) system on SST-1 is used to carry out ECRH-assisted preionization, breakdown, start-up, and experiments at 0.75-T (second harmonic) 1.5-T (fundamental operation. gyrotron delivers 500-kW power frequency −50-kV beam voltage, 20-A current, 19-kV anode voltage. has been commissioned successfully dummy load for full parameters (500 kW/500 ms). transmission line consists of matching optic unit, circular corrugated waveguide, miter bend with...
Electron Cyclotron Resonance Heating (ECRH) system will play an important role in plasma formation, heating and current drive the Superconducting Steady state Tokamak (SST-1). Commissioning activity of machine has been initiated. Many sub-systems have prepared for first discharge. A radial a top port allotted low field side (LFS) high (HFS) launch O X- modes plasma.
We study a technique for diagnostics of the loss tangent inhomogeneity in semi-insulating gallium arsenide within frequency band 0.3 THz and higher. The low-oversize-factor resonator recently developed optical switch formed by an intersection single-mode waveguide cutoff presence semiconductor is used to analyze small fragments movable test wafer. obtained spatial resolution (0.1 mm2) much higher than that known methods. results using finite difference time domain theory synthesis optimal...
A brief review of research activity on gyrotron traveling-wave tube amplifiers (gyro-TWTs) with helically corrugated waveguides developing by the Institute Applied Physics and GYCOM (Nizhny Novgorod, Russia) will be presented.
Three different designs of an external microwave system for feeding and extracting power to from a gyrotron traveling-wave tube (gyro-TWT) through one oversized port are presented discussed. As it shown, such should operate as splitter which splits two wavebeams with mutually orthogonal polarizations incoming into spatially separated ports or transmission lines transporting each wavebeam individually. The orthomode splitters in this paper were designed be used gyro-TWT producing 350- 50-kW...
3D printing technologies offer significant advantages over conventional manufacturing for objects with complicated shapes. This technology provides the potential to easily manufacture barrier windows a low reflection in wide frequency band. Several methods were examined this purpose, and dielectric properties of various types materials used experimentally studied range 26–190 GHz. These measurements show that styrene-butadiene-styrene polyamide plastics are suitable broadband low-reflection...
High-power tests on chemical vapor deposited (CVD) diamond window are carried out using 82.6-GHz Gyrotron. To test CVD with calorimetric dummy load, a matching optic unit is designed and fabricated special profiled mirrors. The mirrors by Gycom Russia mirror box assembly at Institute for Plasma Research. cooled water. consists of four arc detectors the protection window. connected to load this box. alignment done during testing in pulsed condition. After achieving desired Gaussian pattern...