A5034950272- Dust and Plasma Wave Phenomena
- Ionosphere and magnetosphere dynamics
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Solar and Space Plasma Dynamics
- Laser-induced spectroscopy and plasma
- Earthquake Detection and Analysis
- Plasma Applications and Diagnostics
- Cold Atom Physics and Bose-Einstein Condensates
- High-pressure geophysics and materials
- Chaos control and synchronization
- Mechanical and Optical Resonators
- Nonlinear Dynamics and Pattern Formation
- Electrohydrodynamics and Fluid Dynamics
- Nuclear Physics and Applications
- Gamma-ray bursts and supernovae
- Magnetic Properties and Applications
- Vacuum and Plasma Arcs
- Magnetic Field Sensors Techniques
- Particle Dynamics in Fluid Flows
- Gold and Silver Nanoparticles Synthesis and Applications
- Laser-Plasma Interactions and Diagnostics
- Metal and Thin Film Mechanics
- Fluid Dynamics and Turbulent Flows
- Superconducting Materials and Applications
Kiel University
2014-2025
Fachhochschule Kiel
2017-2025
Interface (United States)
2025
Eindhoven University of Technology
2023
University of Oslo
2018
University of Stuttgart
2006
Universität Innsbruck
2006
Max Planck Society
2002
Universität Greifswald
2000-2001
Dusty plasmas are electrically quasi-neutral media that, along with electrons, ions, neutral gas, radiation, and electric and/or magnetic fields, also contain solid or liquid particles sizes ranging from a few nanometers to micrometers. These can be found in many natural environments as well various laboratory setups industrial applications. As separate branch of plasma physics, the field dusty physics was born beginning 1990s at intersection interests communities investigating astrophysical...
Using a relative measurement approach, the sticking coefficients of dielectric materials commonly used in “dust plasma” studies—specifically silica (SiO2), melamine formaldehyde (MF, [C4H8N6O]n), and polymethyl methacrylate (PMMA, [C5O2H8]n)—were estimated. These results offer important insights for interpreting experiments involving various or their combinations, enabling more precise comparisons experimental designs.
Experiments are carried out to investigate the rotation of dust clusters in a radio-frequency plasma sheath with vertical magnetic field. Our observations disagreement standard model, which it was assumed that neutral gas is at rest and steady attained when ion-drag force balanced by friction. Here, we re-examine this basic assumption carefully designed experiments. results suggest set into E×B induced ion flow through ion-neutral collisions particles advected flow. A hydrodynamic model...
We propose and demonstrate a concept that mimics the magnetization of heavy dust particles in complex plasma while leaving properties light species practically unaffected. It makes use frictional coupling between neutral gas, which allows to transfer angular momentum from rotating gas column well-controlled rotation cloud. This induces Coriolis force acts exactly as Lorentz magnetic field. Experimental normal mode measurements for small cluster with four show excellent agreement theoretical...
A dust density wave field is observed in a cloud of nanodust particles confined radio frequency plasma. Simultaneous measurements the properties, grain size and density, as well parameters, number, allow for an estimate ion drift velocity, charge using hybrid model dispersion. It appears that on grains drastically reduced to tens elementary charges compared with isolated The much higher at cloud's periphery, i.e., towards void plasma center also outer edge cloud.
For the in situ analysis of nano-sized particles a laboratory plasma, Mie ellipsometry is well established technique. We present simple setup with two CCD cameras to gain online spatiotempor ...
For spherical dust particles in dusty plasmas, the capacitor model is an easy and widely used to link charge of their floating potential. To extend plasma studies non-spherical particles, a similar relation for arbitrary particle shapes needed. The geometry can be reduced by relating that equivalent particle. Such radius determined experimentally using simulations microsphere aggregates under laboratory conditions. results are compared electrostatic capacitance, as well two approximative...
Comparative studies between a toroidal low-temperature plasma and drift-Alfvén-wave simulations were carried out in order to investigate the microscopic structure of turbulence. The dimensionless parameters TJ-K torsatron [N. Krause et al., Rev. Sci. Instrum. 73, 3474 (2002)] are similar those edge fusion plasma. At same time fluctuations can be fully diagnosed by probe arrays. Fluctuation spectra analyzed wavelet techniques indicating large amount intermittency both numerical experimental...
The influence of a plasma environment on melamine formaldehyde particles is studied. High-precision measurements the vertical confinement frequency with phase-resolved resonance method indicate that particle mass affected in two ways: deposition sputtered material at leads to gain, whereas outgassing water causes loss.
Abstract The formation of wake fields downstream an objects in flowing plasmas has strong implications on structure, stability and dynamics complex plasmas. This paper aims at putting recent experimental investigations different theoretical approaches charging dust grains, grain arrangements the dynamical properties into perspective. Further, combination confinement is discussed, which generic situation It shown that spherical traps resulting competition trap geometry vertical alignment...
The phenomenon of particle chain formation is studied in a two-particle system. A wake positive ions leads to an alignment the negatively charged particles parallel ion flow. dynamic response this dust system small external perturbation evaluated. It shown that eigenfrequency downstream reduced compared isolated particle. This effect can be identified as decharging by focused flow upstream Furthermore, strong asymmetry interaction found. may not attributed entirely forces mediated wake.
The interaction forces between dust grains in a flowing plasma are strongly modified by the formation of ion wakes. Here, we study interparticle mediated wakes presence strong magnetic field parallel to flow. For increasing flux densities continuous decay force is observed. This transition occurs at parameters, where cyclotron frequency starts exceed frequency, which agreement with theoretical predictions. modification important for understanding structure and dynamics magnetized dusty plasmas.
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Hendrik Jung, Franko Greiner, Oguz Han Asnaz, Jan Carstensen, Alexander Piel; Exploring the wake of a dust particle by continuously approaching test grain. Phys. Plasmas 1 May 2015; 22 (5): 053702. https://doi.org/10.1063/1.4920968 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley...
For the investigation of turbulent transport in magnetized plasmas, cross-phase between density and plasma potential fluctuations is a key parameter. In majority experimental studies, floating conventional Langmuir probe used as an estimate for potential. It well known, however, that can have different phases if temperature are present plasma. A diagnostic giving direct emissive probe. this work, measurements from both probes directly compared. The experiments carried out magnetically...
Strongly nonlinear relaxation oscillations of discharge current and plasma potential are investigated in a magnetized thermionic discharge. The quasi-one-dimensional electron motion allows direct comparison with one-dimensional models computer simulations. Two different stable modes can be established, the low-current space charge limited high-current temperature mode. Time resolved probe measurements distribution demonstrate that result from strongly instability structure weak This confirms...
The charge reduction effect is studied in dense dust clouds. saturation currents of Langmuir probes are used to derive the density ions and electrons, which calibrated with plasma oscillation method. potential inside cloud measured an emissive probe, also yields floating a heated nonemitting mode. presence affects ambient plasma. ion densities found equal, while electron reduced cloud. potentials compared current models. Inclusion bi-Maxwellian distribution electrons leads improved...
The growth of nanometer-sized particles in a reactive argon-acetylene plasma is investigated by means kinetic single-wavelength Mie ellipsometry from the change polarization state scattered light. This requires advanced measurement techniques as well complex methods for analysis measured data. Today commercial devices reduce metrological effort, but data still challenging topic. We present scheme to gain time-resolved information about size evolution monodisperse spherical and determine...
In any physical system where a surface is hit by electrons, the sticking probability s of electrons central parameter governing, for example, charging surface. For dielectrics, it could previously only be measured high energies (>100 eV), while well-known metals even at few eV. Recent theoretical investigations concerning dielectrics such as silica predict values significantly below 1. With precision charge measurements on microparticles in sheath low-pressure plasma, difference between and...
The mechanism of different discharge modes, self-oscillations, and the period-doubling route to chaos is studied by comparing experimental results from a filament cathode with particle-in-cell simulations. self-oscillation process invokes ion trapping charge exchange, double layer formation, depletion. exhausting resources which underlies identified incomplete refilling.
Turbulent transport at the transition from closed to open field lines has been investigated in stellarator experiment TJ-K. It is found that drift-wave turbulence confined region responsible for generation of intermittent structures (so-called blobs) unconfined region. There character changes and a decoupling density potential fluctuations observed. The poloidal propagation events can be understood framework background flows caused by gradients equilibrium plasma pressure profiles.
Nanodust is produced in an rf-driven push-pull parallel-plate reactor using argon with acetylene admixture at 5–30 Pa. A scheme for the preparation of nanodust clouds particle radii up to 400 nm investigations magnetized plasmas proposed. The confinement that keeps different inside a moderately discharge (B ≤ 500 mT) investigated by comparison 2d-Langmuir probe measurements dust-free plasma without and magnetic field analysis scattered light clouds. It shown dust cloud changes its shape when...
A cloud of nanodust particles is created in a reactive argon-acetylene plasma. It then transformed into dusty magnetized argon Plasma parameters are obtained with the dust-density wave diagnostic introduced by Tadsen et al. [Phys. Plasmas 22, 113701 (2015)]. change from an open to cylindrically enclosed cloud, which was observed earlier, can now be explained stronger electric confinement if vertical magnetic field present. Using two-dimensional extinction measurements and inverse Abel...
Chaos and turbulence are often considered as troublesome features of plasma devices. In the general framework nonlinear dynamical systems, a number strategies have been developed to achieve active control over complex temporal or spatio-temporal behavior. Many these techniques apply instabilities. present paper we discuss recent progress in chaos taming three different “model” experiments: (1) Chaotic oscillations simple diodes, (2) ionization wave positive column glow discharges, (3) drift...