A5082662386- Dust and Plasma Wave Phenomena
- Ionosphere and magnetosphere dynamics
- Laser-induced spectroscopy and plasma
- Laser-Plasma Interactions and Diagnostics
- Plasma Diagnostics and Applications
- Fusion materials and technologies
- Ion-surface interactions and analysis
- High-pressure geophysics and materials
- Quantum Dots Synthesis And Properties
- Food composition and properties
- Metal and Thin Film Mechanics
- Advanced materials and composites
- Astrophysics and Star Formation Studies
- Atomic and Molecular Physics
- Laser Material Processing Techniques
- Ocular and Laser Science Research
- Radiation Effects and Dosimetry
- Solar and Space Plasma Dynamics
- Semiconductor Quantum Structures and Devices
- Biofuel production and bioconversion
- Particle Accelerators and Free-Electron Lasers
- Combustion and Detonation Processes
- Pulsed Power Technology Applications
- Luminescence Properties of Advanced Materials
- GaN-based semiconductor devices and materials
National Institute for Laser Plasma and Radiation Physics
2017-2024
The impact of dual sequential modifications using radio-frequency (RF) plasma and electron beam irradiation (EBI) on starch properties was investigated compared with single treatments within an dose range 5–20 kGy. Regardless sequence, synergistically affected properties, increasing acidity, solubility, paste clarity, while decreasing rheological features dose. molecular weight distribution also influenced. Amylopectin broadened particularly below 10 Amylose narrowed its across all doses....
Abstract A novel laboratory platform has been designed and built for the irradiation of a plasma crystal (PC) with an electron beam (e-beam) having energy around 10 keV current tens milliamperes. The pulsed e-beam collimated to few millimeter-size spot is aimed at made dust particles levitated in radio-frequency (RF) plasma. consists three vacuum chambers connected in-line, each different utility: one generating free electrons hollow-anode Penning discharge, another extraction acceleration...
Two methods for inferring the dose of electron beam (EB) provided by ALID-7 linear accelerator (LINAC) are compared. The main parameters are: energy 6MeV, pulse duration 4μs and frequency 53Hz. reference dosimeter is a graphite calorimeter built in-house, whose measured depends on irradiation time. In order to modify given time, voltage applied filament gun varied in range 8–12 V. can provide reliable measurements (doses above 0.48kGy) times sufficiently long (above 10 s) voltages where...
Dust is a challenge for the design and operation of equipment on Martian surface, particularly solar cells. An efficient robust technique removing dust sand from surfaces immersed in CO2 at low pressure presented. The working principle based pulsed plasma jet produced between two coaxial electrodes biased voltages 1 2 kV. A demonstration presented using particles whose chemical composition mimic Mars soil. array connected photovoltaic cells fully covered with exposed to jet. open circuit...
The kinetic effects on the dust particles are studied experimentally in a plasma crystal locally irradiated by narrow pulsed electron beam with an energy of 13 keV and peak current 4 mA. We observe top layer formation stable flow along irradiation direction first ≈200 ms interaction. eventually becomes perturbed later time, having chaotic trajectories as they still drifting direction. speed is mapped horizontal plane using particle image velocimetry technique (PIV). its vorticity deduced...
The interest in complex plasmas is increasing due to the multiple applications they target (astrophysics, plasma fusion, industry, etc.). A crystal with two vortexes made of spherical microparticles that levitates an rf interacts a gas jet. displaced jet propagation direction neutral pushing force, maintaining its vortex structure. shift also involves change shape, especially at level vortexes. One stretched, and other one compressed. During three phases modification shape crystal, length...
A strongly coupled quasi-two-dimensional dusty plasma confined electrostatically in the sheath of a radio frequency (RF) is irradiated by collimated and mono-energetic pulsed electron beam (e-beam) with an energy 13 keV high peak current per pulse 30 mA. stream rapidly moving charged dust particles created inside crystal due to drag force electrons e-beam. The flow split into two symmetrical branches when it reaches boundary round crystal, each following limit circular confining region. This...
Femtosecond laser pulses are currently regarded as an emerging and promising tool for processing wide bandgap dielectric materials across a variety of high-end applications, although the associated physical phenomena not yet fully understood. To address these challenges, we propose original, analytical model combined with Two Temperatures Model (TTM) formalism. The is applied to describe interaction fs typical target (e.g., Sapphire). It describes heating dielectrics, such Sapphire, under...
Manipulation of microscopic structures is routinely carried out by exploiting the light pressure a focused laser beam. Here we use pulsed electron beam (EB) with energy 10–14 keV and peak current 4 mA instead photon flux demonstrate transport matter over few centimeters. Hundreds electrically charged microspheres in diameter immersed radio-frequency plasma are driven into flow speed mm s−1 when irradiated EB. It shown that force associated momentum transfer consistent observed acceleration...
A 1-mm-size cluster composed of 10 dust particles immersed in plasma is rotated by the torque a pulsed electron beam with energy range 8--12 keV. The are electrically charged spheres radius 5.9 $\ensuremath{\mu}\mathrm{m}$ and levitated sheath, forming round, planar, Coulomb-coupled cluster. irradiates passing slightly off its center, sets motion action drag force. total at 12 keV $4.9\ifmmode\pm\else\textpm\fi{}0.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}$ Nm an angular...
The ultrafast fs laser pulse heating of thin metal films is studied for the first time using two-temperature model on basis Fokker–Planck formalism. incident radiation multi-modal, while electron temperature described during 2 fs. predictions are intended use by experimentalists in optoelectronics, photonics, processing, electronics, and bio- nanomedicine. crucial role nano-sized spatial dimensions sample highlighted. A significant result this study interdependence between target’s size,...
The target normal sheath acceleration is a robust mechanism for proton and ion from solid targets when irradiated by high power laser. Since its discovery extensive studies have been carried out to enhance the process either optimizing laser pulse delivered onto or utilizing with particular features. Targets different morphologies such as geometrical shape (thin foil, cone, spherical, foam-like, etc.), structures (multi-layer, nano- micro-structured periodic striations, rods, pillars, holes,...
Abstract We measured the peak force of plasma jet produced by a pulsed coaxial gun operated at voltages up to 2 kV, using home-made ballistic pendulum positioned in two locations, one proximity nozzle 0.75 cm and second distance 9 from nozzle. The wind is inferred ranges 11 60 N, which almost an order magnitude higher than that typical ion-based thrusters. results various models self-field magneto-plasmadynamic thrusters indicate magnetic component thrust tends dominate over thermal...
Experimental studies with one single dust rod and small assemblies of two three vertically aligned rods levitated in the plasma sheath above driven electrode are presented. The particle dynamics is studied at different gas pressures, from 90 to 250 mtorr, by varying continuously input radio frequency (RF) power 2 10 W. Oscillations were observed experiments. In case three-particle system, spontaneous rotation middle was induced. Its trajectory forms a chaotic attractor largest Lyapunov...
In fusion reactors, such as ITER or DEMO, the plasma used to generate nuclear reactions will reach temperatures that are an order of magnitude higher than in Sun’s core. Although is not supposed be contact with reactor walls, a large amount heat generated by electromagnetic radiation, electrons and ions being expelled from plasma-facing surface reactor. Especially for divertor part, high fluxes up 20 MW/m2 expected even normal operating conditions. An improvement material (which is, case...
The splitting of CO2 was studied in a pulsed plasma discharge produced coaxial gun at voltages between ~1 and 2 kV peak currents 7 to 14 kA. ejected from the speed few km/s had electron temperatures 11 eV with densities ~2.4 × 1021 particles m−3. Spectroscopic measurements were carried out plume pressures 1 5 Torr, evidence dissociation into oxygen CO found. An increased current led observation more intense spectra lines presence new lines, which implies channels. Several mechanisms are...
Abstract Phosphorescent microparticles made of ZnS:Ag were exposed to pulsed electron beams with an energy 13 keV for periods time between 30 minutes and 240 minutes. An XRD analysis showed no modification crystalline structure. The average cristalites was 62 nm deduced from SEM imaging. luminescence spectra a decreasing activity 40% after irradiation at fluence 5.79 x 1016 electrons/cm2. broad peak 445 480 centered aroud 460 FWHM almost constant 80 show shifting. After long exposure (over...
Small multilayered laminated samples consisting of stacks W (or K-doped W) foils without an interlayer or with interlayers from Cu, V, and Ti were exposed to a pulsed electron beam energy 6 MeV in several irradiation sessions. All maintained their macroscopic integrity, suggesting that the W-metal laminate concept is compatible high heat flux applications. The surface was analyzed using scanning microscope (SEM) before after each session. experimental results indicate induces obvious...