A5054299106- Fusion materials and technologies
- Diamond and Carbon-based Materials Research
- Ion-surface interactions and analysis
- Nuclear Materials and Properties
- Metal and Thin Film Mechanics
- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Electron and X-Ray Spectroscopy Techniques
- Laser-induced spectroscopy and plasma
- Advanced Materials Characterization Techniques
- High-pressure geophysics and materials
- Mass Spectrometry Techniques and Applications
- Semiconductor materials and devices
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Advanced Chemical Physics Studies
- Thin-Film Transistor Technologies
- Monoclonal and Polyclonal Antibodies Research
- Advanced materials and composites
- Atomic and Molecular Physics
- Cancer Immunotherapy and Biomarkers
- HER2/EGFR in Cancer Research
- Laser-Plasma Interactions and Diagnostics
- Neuroscience and Neuropharmacology Research
Max Planck Institute for Plasma Physics
2016-2025
Max Planck Society
2012-2021
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013
Institute of Plasma Physics
2013
Max Planck Institute of Psychiatry
2004-2012
MerLion Pharma (Germany)
2009
University of Tübingen
2003-2004
North Dakota State University
2002
Matsutani (Japan)
2002
University of Antwerp
1988-2000
Hydrocarbon films were prepared by electron cyclotron resonance plasma deposition from different hydrocarbon source gases at varying ion energies. The used the saturated hydrocarbons CH4, C2H6, C3H8, C4H10 (n- and iso-) unsaturated C2H4 C2H2 as well mixtures of these with hydrogen. Film was analyzed in situ real-time ellipsometry, resulting ex ion-beam analysis. On basis large range parameters investigated, correlation between gas, parameters, film properties determined. are found to be...
We compare reported compositions of a-C:H films in a ternary phase diagram. It is assumed that the comprised three phases: sp3 hybridized carbon, sp2 carbon and hydrogen. The data are found to split into two well-separated groups. This separation depends on method used measure sp3/sp2 ratio. conclude from comparison NMR infrared analysis does not provide quantitative
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...
The growth of hydrocarbon films (C:H films) from a methane plasma and their erosion by hydrogen are investigated means in situ ellipsometry. kinetic energy the ions impinging on surface during deposition is varied applying rf bias resulting dc self-bias ranging floating potential up to 100 V. In addition, substrate temperature room 600 K. direct comparison between indicates that dependence rate caused temperature-dependent due reactions with abundant atomic hydrogen. Furthermore, synergistic...
We present an electron-cyclotron-resonance plasma source with a biased sample holder that is well suited for the implantation of deuterium ions into tungsten. Achievable energies range from several electronvolts up to 200 eV per deuteron. The ion fluxes this were thoroughly quantified retarding field analyser and monitor, i.e. energy resolving mass spectrometer. results these measurements different microwave input powers, D2 gas pressures bias settings. Typical achievable deuteron are order...
The use of nitrogen seeding to reduce the edge plasma temperature has recently been successfully applied in ASDEX Upgrade. While performance was significantly improved compared with other species such as Ar or Ne, questions remained interaction a tungsten first wall. In particular formation thick nitride layers reduced melting and increased physical sputtering concern. Therefore dedicated laboratory experiments have performed investigate W surfaces N plasmas. Tungsten coated Si samples were...
The first successful growth of diamond layers on levitated seed particles in CH4/H2 plasma is presented. were grown a rf chamber equipped with tungsten hot filament. injected are negatively charged and under the balance several forces, chemical vapor deposition takes place them. SEM images show that crystalline structures formed after coagulation islands. micro-Raman spectroscopy particle hours shows clear peak assigned to diamond.
Abstract Fundamental understanding of hydrogen–metal interactions is challenging due to a lack knowledge on defect production and/or evolution upon hydrogen ingression, especially for metals undergoing irradiation with ion energy below the displacement thresholds reported in literature. Here, applying novel low-energy argon-sputter depth profiling method significantly improved resolution tungsten (W) surfaces exposed deuterium (D) plasma at 300 K, we show existence 10 nm thick...
Erosion of hydrocarbon films at room temperature due to argon ions and thermal atomic hydrogen is investigated in a particle-beam experiment. Physical sputtering by the observed energies ⩾200 eV reaches yield 0.5 an ion energy 800 eV. The measured yields are agreement with TRIM.SP computer simulations, threshold ≃58 derived for physical sputtering. simultaneous fluxes atoms all down 20 about 3 hydrogen-atom-to-argon-ion-flux ratio 400. It proposed that significant decrease as well increase...
A nonocclusive silicone cuff placed around the rabbit carotid artery results in a diffuse intimal thickening. The early stages of this phenomenon were studied by light microscopy, immunohistochemistry, and electron microscopy. Neointimal formation appeared to be triphasic. first phase started 2 hours after placement, with vascular infiltration polymorphonuclear leukocytes (PMNs). In second phase, starting within 12 hours, 1.90 +/- 0.36% medial smooth muscle cells (SMCs) replicating, as...
Noncrystalline hydrocarbon films were deposited from methane plasmas in an electron-cyclotron-resonance plasma reactor. The characterized by infrared spectroscopy and high-energy ion-beam analysis. Film properties investigated as a function of the energy ions impinging on surface growing film. ion was varied applying dc bias to sample range 30 200 eV. measured with retarding field analyzer under identical experimental conditions. An abrupt change found sp3/sp2 ratio interval 80 120 Other...
To investigate the impact of averseness, controllability and familiarity a test situation on involvement endocannabinoid system in regulation exploratory behaviour, we tested conventional conditional cannabinoid receptor type 1 (CB1)-deficient mice behavioural paradigms with different emotional load, which depended strength illumination ability animals to avoid light stimulus. Complete CB1 null-mutant (Total-CB1-KO) showed an anxiogenic-like phenotype under circumstances where they were able...
Mechanisms underlying the retention of fuel species in tokamaks with carbon plasma-facing components are presented, together estimates for corresponding tritium ITER. The consequential requirement new and improved schemes to reduce inventory is highlighted results ongoing studies into a range techniques removal rate ITER each case. Finally, an approach involving integration many operational schedule proposed as means extend period operations before major intervention required.
Sputtering of the pure materials iron (Fe), chromium (Cr) and tungsten (W) due to energetic deuterium (D) ion bombardment was investigated. These are important constituents reduced-activation ferritic-martensitic steels. yields were measured as a function D energy from 60 2000 eV/D. The obtained data can be well reproduced by semi-empirical formula suggested Bohdansky, corresponding fitting parameters provided. It is confirmed that analytical formulae Eckstein Yamamura agree satisfactorily...
A comprehensive experimental investigation of absolute ion and neutral species densities in an inductively coupled H2-N2-Ar plasma was carried out. Additionally, the radical were calculated using a zero-dimensional rate equation model. The studied at pressure 1.5 Pa rf power 200 W. N2 partial fraction varied between fN2=0% 56% by simultaneous reduction H2 fraction. Ar held constant about 1%. NH3 found to be produced almost exclusively on surfaces chamber wall. contributes up 12% background...