A5006567111- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Ionosphere and magnetosphere dynamics
- Gyrotron and Vacuum Electronics Research
- Plasma Applications and Diagnostics
- Vacuum and Plasma Arcs
- Laser-Plasma Interactions and Diagnostics
- Metal and Thin Film Mechanics
- Microwave-Assisted Synthesis and Applications
- Solar and Space Plasma Dynamics
- Dust and Plasma Wave Phenomena
- GaN-based semiconductor devices and materials
- Laser-induced spectroscopy and plasma
- nanoparticles nucleation surface interactions
- Diamond and Carbon-based Materials Research
- Electrostatic Discharge in Electronics
- Ga2O3 and related materials
- Pulsed Power Technology Applications
- Aerosol Filtration and Electrostatic Precipitation
- Acoustic Wave Resonator Technologies
- Microwave Engineering and Waveguides
- Particle Accelerators and Free-Electron Lasers
- Semiconductor Quantum Structures and Devices
- Advanced MEMS and NEMS Technologies
Institute of Applied Physics
2016-2025
A.M. Obukhov Institute of Atmospheric Physics
2015-2024
Russian Academy of Sciences
2003-2024
N. I. Lobachevsky State University of Nizhny Novgorod
2020-2024
Joint Institute for Nuclear Research
2020
Rutherford Appleton Laboratory
2020
Institute for Physics of Microstructures
2013
Experimental observation of cyclotron instabilities in a minimum-B confined electron resonance ion source plasma is reported. The are associated with strong microwave emission and burst energetic electrons escaping the plasma, explain periodic ms-scale oscillation extracted beam currents. Such non-linear effects detrimental for confinement highly charged ions due to perturbations at shorter intervals comparison their production time. It shown that repetition rate oxygen plasmas increases...
Multiple frequency heating is one of the most effective techniques to improve performance Electron Cyclotron Resonance (ECR) ion sources. The method increases beam current and average charge state extracted ions enhances temporal stability beams. It demonstrated in this paper that stabilizing effect two-frequency connected with suppression electron cyclotron instability. Experimental data show interaction between secondary microwave radiation hot component ECR source plasmas plays a crucial...
Electron cyclotron resonance ion sources (ECRIS) have been essential in the research and applications of nuclear physics over past 40 years. They are extensively used a wide range large-scale accelerator facilities for production highly charged heavy beams stable radioactive elements. ECRISs susceptible to kinetic instabilities due heating mechanism leading anisotropic electron velocity distribution function. Instabilities type proven cause frequently observed periodic bursts 'hot' electrons...
Electron cyclotron resonance ion source (ECRIS) plasmas are prone to kinetic instabilities due anisotropic electron velocity distribution. The associated with strong microwave emission and periodic bursts of energetic electrons escaping the magnetic confinement. explain ms-scale oscillation extracted beam current observed several high performance ECRISs restrict parameter space available for optimization currents highly charged ions. Experiments JYFL 14 GHz ECRIS have demonstrated that...
Electron cyclotron resonance ion source (ECRIS) plasmas are prone to kinetic instabilities due anisotropy of the electron energy distribution function stemming from resonant nature heating process. plasma related non-linear interaction between waves and energetic electrons resulting strong microwave emission a burst escaping plasma, explain periodic oscillations extracted beam currents observed in several laboratories. It is demonstrated with minimum-B 14 GHz ECRIS operating on helium,...
The measurement of the electron energy distribution (EED) electrons escaping axially from a minimum-B cyclotron resonance ion source (ECRIS) is reported. experimental data were recorded with room-temperature 14 GHz ECRIS at JYFL accelerator laboratory. through extraction mirror detected secondary amplifier placed downstream dipole magnet serving as an spectrometer 500 eV resolution. It was discovered that EED in range 5–250 keV strongly non-Maxwellian and exhibits several local maxima below...
The results of first experiments on the investigation plasma electron cyclotron resonance (ECR) discharge, sustained by CW radiation technological gyrotron with frequency 24 GHz are considered. parameters nitrogen ECR discharge in magnetic field up to 1 T were investigated Langmuir probe pressure range 10(-4)-10(-2) mbar under different values microwave power. Depending gas and power radiation, typical temperature density electrons could attain 1-5 eV 10(11)-10(12) cm(-3), respectively....
The work presented in this article is devoted to time-resolved diagnostics of non-linear effects observed during the afterglow plasma decay a 14 GHz electron cyclotron resonance ion source operated pulsed mode. Plasma instabilities that cause perturbations extracted current were and studied. It shown these are associated with precipitation high energy electrons along magnetic field lines strong bursts bremsstrahlung emission. effect settings on onset was investigated. Based experimental data...
This paper summarizes the studies of plasma kinetic instabilities in electron cyclotron frequency range carried out over last decade at Institute Applied Physics Nizhny Novgorod. We investigate nonequilibrium created and sustained by high-power microwave radiation a gyrotron under resonance condition. Resonant heating results formation least two components, one which, more dense cold, determines dispersion properties high-frequency waves, other, small group energetic electrons with highly...
Kinetic instabilities of nonequilibrium plasma heated by powerful radiation gyrotron in electron cyclotron resonance conditions and confined a mirror magnetic trap are reported. Instabilities manifested as the generation short pulses electromagnetic accompanied precipitation hot electrons from trap. Measuring field with high temporal resolution allowed to observe various dynamic spectra related at least five types kinetic instabilities. This paper may be interest context laboratory modeling...
A threefold increase in the CO2 conversion and energy efficiency due to cooling of post-discharge region by counter gas flow has been achieved plasma an atmospheric pressure discharge supported microwave radiation a gyrotron with frequency 24 GHz carbon dioxide flow. The role convective heat transfer process mixture experimentally demonstrated. At nitrogen quench 4.5 l/min, was 23.8 % 19.7 %. possibility using cooled (CO2,CO,O2) taken from reactor as quenching demonstrated, which made it...
The new method for metal oxide nanopowder production is proposed. It the evaporation–condensation using a focused microwave radiation. source of microwaves technological gyrotron with frequency 24 GHz and power up to 7 kW energy density flux 13 kW/cm2. Radiation was on layer powder treated material ensure its evaporation, subsequent condensation vapor in gas stream, deposition particles water-cooled surface. Deposited powders consist whose sizes are range 20 nm 1 μm. consists having...
A microwave discharge of atmospheric pressure, maintained by focused CW radiation a 24-GHz gyrotron in an argon flow external air atmosphere, was investigated. The electron temperature determined the current-voltage curve dual Langmuir probe placed plasma torch. also estimated from emission spectra within framework coronal model. obtained values coincide measurement accuracy. Also, is many times higher than gas temperature. This fact allows us to stand significantly non-equilibrium pressure plasma.
Further progress in the development of electron cyclotron resonance (ECR) ion sources (ECRISs) requires deeper understanding underlying physics. One topics that remains obscure, though being crucial for performance ECRIS, is energy distribution (EED). A well-developed technique measuring EED electrons escaping axially from magnetically confined plasma an ECRIS was used study unstable mode confinement, i.e., presence kinetic instabilities. The experimental data were recorded pulsed and CW...
The electron and gas temperature of non-equilibrium argon plasma torch sustained by a focused 24 GHz microwave beam in the external atmosphere air was measured optical emission spectroscopy. excitation atoms found about 5000 K, while vibrational rotational temperatures ambient nitrogen molecules were respectively estimated at 3000 K 2000 K. effective mixing into is experimentally demonstrated. slightly increased with distance from nozzle exit. Experimental results demonstrate that discharge...
A specific nonlinear regime of electron-cyclotron instability is discussed aimed at explaining the complex temporal patterns stimulated electromagnetic radiation from a mirror trap with non-equilibrium plasma typical an ECR discharge. This characterized by self-modulation cyclotron maser due to coherent interference two counter-propagating unstable waves degenerate frequencies resulting in spatial modulation amplification coefficient. The proposed simple theoretical model allows one...
An extreme-ultraviolet (EUV) source based on a low-pressure discharge sustained in magnetic trap by the high-power millimeter-wave radiation under electron-cyclotron-resonance (ECR) conditions is discussed. Multiple charged ions are efficiently generated and excited such (tin injected into from vacuum-arc were used) emit line desired wavelength range. A power of 50 W solid angle 4π sr range 13.5 nm±1% an efficiency about 1% for conversion microwave absorbed plasma to extreme ultraviolet...
In the developed waveguide plasmatron with combined gas influx, a nonequilibrium discharge maintained at atmospheric pressure by continuous microwave gyrotron radiation 24 GHz was obtained and studied for first time. It is shown that in regime of argon stabilization carbon dioxide flow temperature electrons 0.2-0.3 eV 1200-1500 K electron density does not exceed cutoff value heating frequency wide power range. Keywords: heating, discharge, plasma, gyrotron.
Experimental investigation is undertaken to study formation of electron energy distribution function (EEDF) at the initial stage cyclotron resonance (ECR) discharge inside magnetic mirror trap. In experiment, where was initiated by high power radiation gyrotron operated in mm-wavelength range, electrons were revealed leave trap having EEDF be quite different from Maxwellian one. Specifically, found decrease slowly with up 400-500 keV and drops abruptly further. The possible physical...