A5007214764- Plasma Diagnostics and Applications
- Metal and Thin Film Mechanics
- Magnetic confinement fusion research
- Fusion materials and technologies
- Diamond and Carbon-based Materials Research
- Laser-induced spectroscopy and plasma
- Plasma Applications and Diagnostics
- Magnetic Field Sensors Techniques
- Semiconductor materials and devices
- Particle accelerators and beam dynamics
- Nuclear Materials and Properties
- Non-Destructive Testing Techniques
- Scientific Research and Discoveries
- Ion-surface interactions and analysis
- Magnetic Properties and Applications
- Electrostatic Discharge in Electronics
- Induction Heating and Inverter Technology
- Laser-Plasma Interactions and Diagnostics
- Education Practices and Evaluation
- ZnO doping and properties
- Mobile Learning in Education
- Advancements in Semiconductor Devices and Circuit Design
- Educational Research and Pedagogy
- Dust and Plasma Wave Phenomena
- Technology-Enhanced Education Studies
Alexandru Ioan Cuza University
2015-2024
Centre National de la Recherche Scientifique
2007-2010
Czech Academy of Sciences, Institute of Plasma Physics
2008
Université Paris-Sud
2005-2007
Laboratoire de Physique des Gaz et des Plasmas
2005
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...
Two separate scientific communities are shown to have studied one common phenomenon, azimuthally rotating dense plasma structures, also called spokes, in pulsed-power E × B discharges, starting from quite different approaches. The first body of work is motivated by fundamental science and concerns a phenomenon the critical ionization velocity, CIV, while other applied high power impulse magnetron sputtering (HiPIMS). Here we make use this situation applying experimental observations,...
In this paper a validated 2D axisymmetric plasma fluid model was used to study the influence of level nitrogen impurities on processes that occur in helium parallel plate dielectric barrier discharge. The varied range 0.1–500 ppm. It observed significantly affect dominant ion species at breakdown and discharge characteristics. Specifically, three different ions were found, which are strongly dependent impurities. These are: (0.1–35 ppm), (35–150 ppm) (150–500 ppm). addition, results show...
High power impulse magnetron sputtering (HiPIMS) technology is particularly interesting for its high ionization efficiency of the sputtered target elements. However, one major drawbacks typically lower deposition rate, compared to direct current (DCMS), mainly due metal ion back-attraction. Using HiPIMS with very short pulses (less than 5 µs), it possible partially overcome rate limitation. In this contribution our focus optimization process respect DCMS, based on physical understanding...
2D particle simulations of plasma evolution in high power impulse magnetron sputtering (HiPIMS) are very scarce. Short HiPIMS unipolar pulses ( plateau at constant ) applied on a planar cathode with metal target operated pure argon . The model begins pre-ionised gas before the pulse, defined as typical direct current (DC) discharge (). Applying voltage pulse leads to sharp increase current. external circuit is reduced simple resistance connected series discharge. Both and fed by supply....
A two-dimensional (r, z) time-dependent fluid model was developed and used to describe a dc planar magnetron discharge with cylindrical symmetry. The transport description of the charged species uses corresponding first three moments Boltzmann equation: continuity, momentum transfer mean energy (the last one only for electrons), coupled Poisson equation. An original method is proposed treat equations. Electron ion equations are reduced classical drift–diffusion expression fluxes since...
Abstract Simultaneous measurements of the ion temperature by segmented tunnel and Katsumata probe in CASTOR tokamak are reported. The measures two saturation currents I seg 1 , 2 towards segments tunnel. axis is aligned with total magnetic field. value ratio these combined results PIC modeling provides temperature. Design experimental arrangement enable us to measure pure current sweeping applied voltage. then estimated from exponential part measured – V characteristic. agree within a few...
Linear plasma generators are devices designed to study fusion-relevant plasma-surface interactions. The first requirement for such is operate with adjustable and well characterized parameters. In the linear device Magnum-PSI, distribution of charged particle flux across target surface can be tailored by bias. process based on radial inhomogeneity column it evidenced electrical measurements via a 2D multi-probe system installed as target. Typical results reported hydrogen discharge operated...
The linear plasma generator Magnum-PSI was designed for the study of plasma–surface interactions under relevant conditions fusion devices. A key factor such studies is knowledge a set parameters that characterize interacting with solid surface. This paper reports on electrical diagnosis beam in using multi-probe system consisting 64 probes arranged 2D square matrix. Cross-section distributions floating potential and ion current intensity were registered hydrogen various discharge currents...
This work is focused on controlling and optimizing the inclusion of neon (Ne) argon (Ar) impurities in tungsten (W) reference coatings. A target has been sputtered monopolar bipolar High Power Impulse Magnetron Sputtering (HiPIMS) operation modes, Ar-Ne gas mixture. It found that process noble retention W thin layers strongly dependent both ion energy average flux to substrate. The can be accurately controlled by amplitude positive voltage pulse while duration negative pulse. Measurements...
Electron transport across magnetic barriers is crucial in all magnetized plasmas. It governs not only the plasma parameters volume, but also fluxes of charged particles towards electrodes and walls. particularly important high-power impulse magnetron sputtering (HiPIMS) reactors, influencing quality deposited thin films, since this type discharge characterized by an increased ionization fraction sputtered material. Transport coefficients electron clouds released both from cathode several...
The secondary electron emission process is essential for the optimal operation of a wide range applications, including fusion reactors, high-energy accelerators, or spacecraft. can be influenced and controlled by use magnetic field. An analytical solution proposed to describe in an oblique It was derived from Monte Carlo simulations. formula captures influence field magnitude tilt, energy, reflection on surface, electric intensity process. last two parameters increase effective while others...
Abstract In some experimental conditions the electron saturation current of a cylindrical probe placed in magnetized plasma and oriented along magnetic field lines shows large increase when is positively biased with respect to potential. The might double which followed by negative slope current‐voltage characteristic positive bias further increased. This particular behavior was investigated versus length (0 – 5 mm) radius, orientation lines, strength (up 0 . 42 T), gas nature pressure,...
Multifluid two-dimensional model was developed to describe the plasma kinetics of direct current Ar/O2 magnetron, coupling two modules: charged particles and neutrals. The first module deals with three positive ions—Ar+, O2+, O+—and negative species—e− O−—treated by moments Boltzmann’s equation. second one follows seven neutral species (Ar, O2, O, O3, related metastables) multicomponent diffusion technique. modules are self-consistently coupled mass conservation kinetic coefficients taking...
A time-resolved fast imaging technique was applied for the investigation of both gas (Ar) and sputtered material (Al) excited species in a high-power short-pulse magnetron discharge.
Abstract The plasma flow velocity in the azimuthal and axial directions was estimated from a cross-correlation analysis of ion saturation currents measured across column Magnum-PSI using 64-probe matrix acting as target. radial profile rotation direction revealed reversed at larger radii ( r > 12–16 mm, depending on magnetic field strength). result confirmed by comparison with calculated sum E × B drift (estimated potential) diamagnetic pressure). associated electron current path...
Simple analytical formulas are proposed to describe the plasma potential in a steady-state magnetron discharge, based on results of various experiments and numerical simulations reported literature. The description is two-dimensional (2D), covering two main regions, cathode sheath ionization region, both contributing electron energization. A parabolic axial direction governs sheath. thickness obtained from 1D collisionless Child-Langmuir law. or linear characterizes region. local ion current...
This paper focuses on the experimental validation of 2D fluid model developed for magnetron discharges. Numerical simulations have been applied to an axi-symmetric planar direct current (DC) working in Ar at low pressures, range 0.67–4 Pa. Axial distributions electron density and mean energy are calculated, discussed compared with measurements. The double vectorial map both electric magnetic fields is attained from front cathode, including high-density region. Besides, results used explain...