A5027771025- Dust and Plasma Wave Phenomena
- Ionosphere and magnetosphere dynamics
- Nuclear Physics and Applications
- Plasma Diagnostics and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Magnetic confinement fusion research
- Solar and Space Plasma Dynamics
- Radiation Detection and Scintillator Technologies
- Lichen and fungal ecology
- Particle accelerators and beam dynamics
- Plasma Applications and Diagnostics
- Particle Dynamics in Fluid Flows
- Laser-induced spectroscopy and plasma
- Atomic and Subatomic Physics Research
- Electrohydrodynamics and Fluid Dynamics
- Atomic and Molecular Physics
- Scientific Research and Discoveries
- Geomagnetism and Paleomagnetism Studies
- Characterization and Applications of Magnetic Nanoparticles
- Boron Compounds in Chemistry
Kiel University
1969-2018
University of Oslo
2018
Fachhochschule Kiel
2018
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.
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...
A novel approach of using microparticles as probes for the sheath structure radio-frequency discharges is presented. Starting with a heavy (large) particle confined deep in plasma sheath, ambient causes continuous mass loss, which increases levitation height particle. It shown that this process can be precisely monitored phase-resolved resonance method, allows probing force balance high spatial resolution. The resulting profile reasonable agreement recent models.
The potential and density wake behind a finite-sized object in magnetized collisionless plasma flow is studied with self-consistent numerical simulations. With increasing magnetization of the plasma, standard picture ion focusing for plasmas large electron to temperature ratios becomes invalid. A strong magnetic field parallel direction leads chain depletions enhanced at their envelopes. This due novel mechanism dynamic shadow, which not geometrical shadow object. It corresponds change...
The fundamentals of the ‘resonance method’ are presented. method relies on evaluating dynamic response one or more dust particles in sheath a laboratory plasma to small external perturbations. It allows make situ high-precision measurements particle properties. is shown that mass and charge strength interaction between two can be measured. Technical requirements, limitations application examples presented discussed.
The influence of velocity spread and ion-neutral collisions on the wake a microparticle in collisional magnetized ion flow is explored by means molecular dynamics simulations. described constant-mean-free-path limit. A constant electric field superimposed that maintains drift at Bohm speed approximates conditions plasma sheath. contribution Landau damping to structure separated simulations with collisionless distribution. It found have counteracting effect density focus region. dynamic...
The potential and density structure behind a spherical microparticle in magnetized ion flow are studied by means of molecular dynamics simulations. It is shown that, with increasing magnetization the flow, accumulation wake diminishes. Instead, depleted regions (shadows) form ions accumulate at edge shadows. change distribution also affects force on other microparticles downstream region. For weak short distance, these interparticle forces can be attractive non-reciprocal, as unmagnetized...
The wake behind a spherical microparticle in magnetized ion flow is studied experimentally by analyzing the arrangement of pair particles. It shown that there are two stable particle arrangements at intermediate magnetic inductions, whereas only oblique (horizontal) configurations found highest field. Self-consistent collisional molecular dynamics simulations system show underlying mechanism these weakening attractive forces increasing Plasma instabilities provide trigger for onset...
This article presents two measurement techniques to determine the diameter of a single dust particle during plasma operation. Using long-distance microscopy (LDM), is imaged from outside chamber. In combination with phase-resolved resonance measurements development volume-averaged mass density measured over several hours. The show significant decrease for polymethyl methacrylate (PMMA) particles due etching process on surface. explained by core-shell model and supported surface roughness...
The charging process of micrometer-sized irregularly shaped particles in the sheath a radio frequency discharge is measured using combination long-distance microscopy and phase-resolved resonance method. applicability method shown for cylindrical zinc oxide particle by measuring its mass density. A with more complex geometry compared to spherical polymethyl methacrylate investigate detail. results are similar smallest enclosing sphere suggesting that independent shape particle. Furthermore,...