A5009515152- Laser-induced spectroscopy and plasma
- Fusion materials and technologies
- Ion-surface interactions and analysis
- Plasma Diagnostics and Applications
- Plasma Applications and Diagnostics
- Catalytic Processes in Materials Science
- High voltage insulation and dielectric phenomena
- Laser Design and Applications
- Analytical chemistry methods development
- Nuclear Materials and Properties
- Metal and Thin Film Mechanics
- Electrohydrodynamics and Fluid Dynamics
- Semiconductor materials and devices
- Aerosol Filtration and Electrostatic Precipitation
- X-ray Spectroscopy and Fluorescence Analysis
- Lightning and Electromagnetic Phenomena
- Power Transformer Diagnostics and Insulation
- Metallurgical Processes and Thermodynamics
- Atomic and Molecular Physics
- Laser-Plasma Interactions and Diagnostics
- Diamond and Carbon-based Materials Research
- Cultural Heritage Materials Analysis
- Vacuum and Plasma Arcs
- Gas Dynamics and Kinetic Theory
- Industrial Gas Emission Control
University of Oxford
2025
Hanze University of Applied Sciences
2024
University of Tartu
2011-2021
Culham Science Centre
2014
VTT Technical Research Centre of Finland
2013
National Institute for Laser Plasma and Radiation Physics
2013
Analysis and understanding of wall erosion, material transport fuel retention are among the most important tasks for ITER future devices, since these questions determine largely lifetime availability fusion reactor. These data also extreme value to improve validate models in vessel build-up T inventory D–T devices. So far, research areas is supported by post-mortem analysis tiles. However, access samples will be very much restricted next-generation devices (such as ITER, JT-60SA, W7-X, etc)...
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...
Abstract Laser-induced breakdown spectroscopy (LIBS) is one of the most promising methods for quantitative in-situ determination fuel retention in plasma-facing components (PFCs) magnetically confined fusion devices like ITER and JET. In this article, current state understanding LIBS development applications will be presented, based on a complete review existing results complemented with newly obtained data. The work has been performed as part research programme, set up EUROfusion...
An idealised mesoscale model of the enzymatic digestion starch modelled as a polymer aggregate is used to study effect various enzyme properties, such efficiency, range and radius, on rate at which monomers are released from aggregate. Depending efficiency process found be either reaction- or diffusion-limited. Additionally proportional volume around each bond that accessible enzyme, determined by radius enzyme. Simulations uniformly mixed susceptible resistant polymers reveal no significant...
The ablation and fuel-retention characteristics of aluminum–tungsten (AlW) beryllium–tungsten (BeW) samples have been determined using Laser Induced Breakdown Spectroscopy (LIBS) compared to results obtained Secondary Ion Mass Spectrometry (SIMS). measurements made both at vacuum (of the order 10−4 Pa) 50 Pa argon especially enhance intensities spectral lines H D. For reliable evaluation rate electron density ne temperature Te LIBS plasma with help selected Be, Al, W. has from Stark...
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.
Radiative transitions N 2 ( C – B ,0–0) and OH( A X were used in order to estimate rotational temperatures of ,0) the middle pressure Ar/0.5% O RF discharge. temperature dependence on power density was determined quenching/rotational relaxation frequencies calculated. It found that under our conditions can be for estimation gas while overestimates temperature.
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...
In the present study, Fe2O3 was used as catalyst for removal of NO in a hybrid plasma- catalytic reactor. The located either directly inside plasma-catalytic reactor or separate reactor, which followed ozone producing and injecting plasma Ozone production such dependent on state electrode surface. fresh ensured an order magnitude smaller concentration outlet After short treatment with NO2, its ability to destroy diminished but regained after heating up 100 °C. Similarly earlier results...
Laser-induced breakdown spectroscopy (LIBS) experiments on different ITER-relevant beryllium–tungsten mixtures were performed to develop LIBS for tokamak applications. Some of the samples doped or implanted with deuterium simulate fuel retention. The results indicate that beryllium and tungsten have a number distinguishable spectral lines diagnostics purposes, but detection is challenged by its low concentration fluences used. By studying depth profiles coatings, removal rates layers...
ITER foresees applying laser induced breakdown spectroscopy (LIBS) as a tool for quantitative assessment of fuel retention in the first walls. One open problem related to LIBS application is choice type. Here we compare two Nd/YAG lasers with different pulse durations, 0.15 and 8 ns, working at λ = 1064 nm studies samples D-doped W/Al coatings ≈ 3 μm thickness (Al used proxy Be) on Mo. Low pressure argon was background gas. Experiments were done conditions where other factors (broadening...