A5022488803- Laser-induced spectroscopy and plasma
- Plasma Diagnostics and Applications
- Plasma Applications and Diagnostics
- Ion-surface interactions and analysis
- Fusion materials and technologies
- Metal and Thin Film Mechanics
- Gas Sensing Nanomaterials and Sensors
- ZnO doping and properties
- Analytical chemistry methods development
- Laser Design and Applications
- Electrohydrodynamics and Fluid Dynamics
- Aerosol Filtration and Electrostatic Precipitation
- Petroleum Processing and Analysis
- X-ray Spectroscopy and Fluorescence Analysis
- High voltage insulation and dielectric phenomena
- Vacuum and Plasma Arcs
- Nuclear Materials and Properties
- Atomic and Molecular Physics
- Cultural Heritage Materials Analysis
- Lightning and Electromagnetic Phenomena
- Surface Roughness and Optical Measurements
- Industrial Engineering and Technologies
- Electronic and Structural Properties of Oxides
- Magnetic confinement fusion research
- Mercury impact and mitigation studies
University of Tartu
2009-2020
The ratios of intensities the spectral bands molecular nitrogen corresponding to transitions N + (B 2 � g ,v = 0) → (X 0), N2(C 3 u N2(B and 2) 5) as a function applied electric field strength were measured for air in pressure range 300 10 5 Pa. non-self-sustaining dc discharge parallel-plane gap was used excitation gas molecules. reduced varied (150–5000) × −21 Vm . ratio is compared with theoretical estimates made by other authors. obtained intensity versus curves can be estimation plasmas...
The provision of a particle and power exhaust solution which is compatible with first-wall components edge-plasma conditions key area present-day fusion research mandatory for successful operation ITER DEMO. work package plasma-facing (WP PFC) within the European programme complements laboratory experiments, i.e. in linear plasma devices, electron ion beam loading facilities, studies performed toroidally confined magnetic such as JET, ASDEX Upgrade, WEST etc. connection both groups done via...
This paper presents an experimental investigation of the effect electric field strength on collisional quenching rate nitrogen states N 2 ( C 3 Π u , v = 0) and by oxygen molecules. In experiments, pulses non-self-sustained electrical discharge excite gas The range reduced is from 240 to 4000 Td at pressure 70 4300 Pa. experiments show that has no rate. discusses probable reasons for discrepancy results obtained different authors proposes preferable values coefficients. These coefficients...
The ratio of intensities the first negative system and second positive nitrogen as a function electric field strength was experimentally determined in atmospheric-pressure air. non-self-sustained discharge excited parallel-plane gap using radiation pulsed laser. varied range 135–285 Td. peculiarities measurement data processing signals very low intensity are described. results compared with theoretical predictions other authors.
C5 perfluorinated ketone (C5 PFK with UIPAC chemical name 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone and sold by 3M as Novec™ 5110) has a high dielectric strength low global warming potential, which makes it interesting an insulating gas in medium high-voltage applications. The study was carried out to determine the effective Townsend ionization coefficient αeff function of electric field density for its mixtures air. non-self-sustained discharge between parallel plate...
ITER plans foresee the quantitative diagnostics of fuel retention in reactor walls at near-atmospheric pressures. Using laser induced breakdown spectroscopy (LIBS) for this purpose assumes a reliable resolving Balmer α-lines hydrogen isotopes spectra plasma produced by focused radiation onto target surface. To develop LIBS during maintenance breaks ITER, effect background gas pressure on laser-induced characteristics has been studied. The limits expansion rate and as result it leads to...
It is argued that the experimental results presented by Paris et al in J. Phys. D: Appl. (2005) 38 3894 are correct. shown there no evidence of filamentation or local electric field reinforcement discharge. discussed reaction scheme and rate constants for deactivation excited nitrogen ion proposed Pancheshnyi his Comment must be specified conditions corresponding to experiment carried out al.
Abstract The absorption characteristics of photo‐ionizing VUV radiation emitted by corona discharges in the pressure range from 20 to 750 Torr dry and humid air were measured. experimental results are compared with data approximation formulae obtained others. For a wide region path length, formula proposed Zheleznyak et al. ( Teplofiz. Vysokih Temp . 1982 , 423) seems be most reliable for our air. We propose modification that suitable modelling discharge development ambient magnified image
The ozone production rate as a function of gas pressure and electric field strength is measured in synthetic air dc low-current non-self-sustained discharge. reduced strength, E/N, varied the range 160?520?Td pressure, p, 6.5?162?kPa. generation efficiency, i.e. amount produced per energy unit absorbed by electrons discharge air, for first time. results obtained are compared with theoretical calculations other authors.
Laser-induced breakdown spectroscopy (LIBS) is a promising method for quantifying the fuel content of plasma-facing components ITER both in between plasma discharges (in-situ) and after maintenance operations. The aim present study to test applicability in-situ LIBS monitoring deuterium (D) helium (He) W samples exposed fusion relevant fluxes linear device Pilot-PSI. D loading was performed during 1000 s exposure at low (200-300 °C) surface temperatures. Despite intensity noisy spectra, H...
The firing voltage (FV) of gas discharge in a test cell plasma display materials was investigated for standard protective layers MgO deposited by electron beam, and ternary BaY2O4 BaGa2O4 oxides grown pulsed laser deposition on the special dielectric coated glass substrates. determined FVs (160 V), (210 V) (257 lead to conclusion that replacement these is not expedient panels. Using results from luminescence spectroscopy, values energy gap Eg ≈ 6.2 5.8 eV were estimated BaGa2O4,...
A hypothesis by Akishev et al (1999 J. Phys. D: Appl. 32 2399-409), that the photoionizing radiation emitted positive corona discharge in air is soft x-rays generated electron bombardment of anode surface, discussed. Absorption curves and negative coronae atmospheric are compared. The coincidence shapes these confirms earlier, widely accepted opinion gas molecules atoms, which excited via collision. Photographic detection this performed method proposed found to be improbable, because very...
Abstract The ozone production rate in a dc low-current non-self-sustained discharge (dark discharge) oxygen is measured systematically as function of gas pressure and electric field strength the range reduced strengths E / N = 120–800 Td pressures p 7–160 kPa. fraction energy consumed by electrons dark calculated generation efficiency (the maximal energetic yield an idealized with negligible ion losses) estimated. reaction coefficient for dissociation electron impact, deduced from curve, proposed.