A5055580208- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Nuclear Physics and Applications
- Particle physics theoretical and experimental studies
- Semiconductor materials and devices
- Solar and Space Plasma Dynamics
- Boron and Carbon Nanomaterials Research
- Atomic and Subatomic Physics Research
- Lubricants and Their Additives
- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Tribology and Wear Analysis
- Orthopaedic implants and arthroplasty
- Graphene research and applications
- Advanced materials and composites
- Ion-surface interactions and analysis
- Nuclear physics research studies
- Graphene and Nanomaterials Applications
- Advanced ceramic materials synthesis
- Machine Learning in Materials Science
Friedrich-Alexander-Universität Erlangen-Nürnberg
2018-2023
Chinese Academy of Sciences
2023
Thinfilm (Sweden)
2011-2020
Linköping University
2011-2020
European Spallation Source
2016-2020
Jülich Aachen Research Alliance
2014-2020
Max Planck Institute for Chemistry
2014-2016
Max Planck Society
2015
University of Freiburg
2012
Max Planck Institute for Plasma Physics
2009
A search for neutrinoless double-beta decay ($0\nu\beta\beta$) in $^{136}$Xe is performed with the full EXO-200 dataset using a deep neural network to discriminate between $0\nu\beta\beta$ and background events. Relative previous analyses, signal detection efficiency has been raised from 80.8% 96.4$\pm$3.0% energy resolution of detector at Q-value improved $\sigma/E=1.23\%$ $1.15\pm0.02\%$ upgraded detector. Accounting new data, median 90% confidence level half-life sensitivity this analysis...
Results from a search for neutrinoless double-beta decay (0νββ) of ^{136}Xe are presented using the first year data taken with upgraded EXO-200 detector. Relative to previous searches by EXO-200, energy resolution detector has been improved σ/E=1.23%, electric field in drift region raised 50%, and system suppress radon volume between cryostat lead shielding implemented. In addition, analysis techniques that improve topological discrimination 0νββ background events have developed....
An analog hadron calorimeter (AHCAL) prototype of 5.3 nuclear interaction lengths thickness has been constructed by members the CALICE Collaboration. The AHCAL consists a 38-layer sandwich structure steel plates and highly-segmented scintillator tiles that are read out wavelength-shifting fibers coupled to SiPMs. signal is amplified shaped with custom-designed ASIC. A calibration/monitoring system based on LED light was developed monitor SiPM gain measure full response curve in order correct...
Abstract. Biological particles such as bacteria, fungal spores or pollen are known to be efficient ice nucleating particles. Their ability nucleate is due nucleation active macromolecules (INMs). It has been suggested that these INMs maintain their even when they separated from original carriers. This opens the possibility of an accumulation in soils, resulting internal mixture mineral dust and INMs. If soils which contain biological then dispersed into atmosphere wind erosion agricultural...
B4C coatings for 10B-based neutron detector applications were deposited using high-power impulse magnetron sputtering (HiPIMS) and direct current (DCMS) processes. The on Si(001) as well flat macrostructured (grooved) Al blades in an industrial coating unit compound targets Ar. HiPIMS DCMS processes conducted at substrate temperatures of 100 400 °C the Ar pressure was varied between 300 800 mPa. Neutron detector-relevant characterization performed properties evaluated with regard to their...
Tuning the emission energy of graphene quantum dots (GQDs) and understanding reason tunability is essential for GOD function in optoelectronic devices. Besides material-based challenges, way to realize chemical doping band gap tuning also pose a serious challenge. In this study, we tuned GQDs by substitutional using chlorine, nitrogen, boron, sodium, potassium dopants solution form. Photoluminescence data obtained from (Cl- N-doped) (B-, Na-, K-doped) GQDs, respectively exhibited red-...
CrN thin films with an N/Cr ratio of 95% were deposited by reactive magnetron sputtering onto (0 0 1) sapphire substrates. X-ray diffraction and pole figure texture analysis show (1 1 epitaxial growth in a twin domain fashion. By changing the nitrogen versus argon gas flow mixture deposition temperature, different surface morphologies ranging from grainy rough textures to flat smooth prepared. These parameters can also affect CrNx system, film compound between semiconducting metallic Cr2N...
We apply deep neural networks (DNN) to data from the EXO-200 experiment. In studied cases, DNN is able reconstruct relevant parameters—total energy and position—directly raw digitized waveforms, with minimal exceptions. For first time, developed algorithms are evaluated on real detector calibration data. The accuracy of reconstruction either reaches or exceeds what was achieved by conventional approaches over course Most existing event classification in particle physics trained Monte Carlo...
Ion mass spectrometry was used to investigate discharges formed during high power impulse magnetron sputtering (HiPIMS) and direct current (DCMS) of a graphite target in Ar Ar/N2 ambient. energy distribution functions (IEDFs) were recorded time-averaged time-resolved mode for Ar+, C+, N2+, N+, CxNy+ ions. An increase N2 the sputter gas (keeping deposition pressure, pulse width, frequency, constant) results HiPIMS discharge significant CN+ ion energies. C2N+ energies, turn, did not...
Fluorinated carbon-based thin films offer a wide range of properties for many technological applications that depend on the microstructure films. To gain better understanding role fluorine in structural formation these films, CFx systems based graphene-like fragments were studied by first-principles calculations. Generally, F concentration determines type film can be obtained. For low concentrations (up to ∼5 at. %), with fullerene-like as well graphite-like features are expected. Larger...
Abstract. In the present work, three different techniques to separate ice-nucleating particles (INPs) as well ice particle residuals (IPRs) from non-ice-active are compared. The Ice Selective Inlet (ISI) and Counterflow Virtual Impactor (Ice-CVI) sample mixed-phase clouds allow after evaporation in instrument for analysis of residuals. Fast Nucleus Chamber (FINCH) coupled with Nuclei Pumped (IN-PCVI) provides ice-activating conditions aerosol extracts activated analysis. instruments were run...
ScN-rich (Sc,Nb)N solid solution thin films have been studied, motivated by the promising thermoelectric properties of ScN-based materials. Cubic Sc1-xNbxN for 0 ≤ x 0.25 were epitaxially grown DC reactive magnetron sputtering on a c-plane sapphire substrate and oriented along (111) orientation. The crystal structure, morphology, thermal conductivity, electrical investigated. ScN reference film exhibited Seebeck coefficient −45 μV/K power factor 6 × 10−4 W/m K2 at 750 K. Estimated from room...
Reactive high power impulse magnetron sputtering (rHiPIMS) was used to deposit silicon nitride (SiNx) coatings for biomedical applications. The SiNx growth and plasma characterization were conducted in an industrial coater, using Si targets N2 as reactive gas. effects of different N2-to-Ar flow ratios between 0 0.3, pulse frequencies, target settings, substrate temperatures on the discharge N content investigated. Plasma ion mass spectrometry shows amounts ionized isotopes during initial...
Liquid xenon (LXe) is employed in a number of current and future detectors for rare event searches. We use the EXO-200 experimental data to measure absolute scintillation ionization yields generated by $\ensuremath{\gamma}$ interactions from $^{228}\mathrm{Th}$ (2615 keV), $^{226}\mathrm{Ra}$ (1764 $^{60}\mathrm{Co}$ (1332 keV 1173 keV) calibration sources, over range electric fields. The $W$ value that defines recombination-independent energy scale measured be...
The Multi-Blade is a Boron-10-based gaseous detector introduced to face the challenge arising in neutron reflectometry at pulsed sources. Neutron reflectometers are most challenging instruments terms of instantaneous counting rate and spatial resolution. This has been designed cope with requirements set for upcoming European Spallation Source (ESS) Sweden. Based on previous results obtained Institut Laue-Langevin (ILL) France, an improved demonstrator built ESS tested Budapest Centre (BNC)...
In this study, the dissolution rate of SiNx coatings was investigated as a function coating composition, in comparison to cobalt chromium molybdenum alloy (CoCrMo) reference. with N/Si ratios 0.3, 0.8 and 1.1 were investigated. Electrochemical measurements complemented solution (inductively coupled plasma techniques) surface analysis (vertical scanning interferometry x-ray photoelectron spectroscopy). The evaluated 0.2–1.4 nm/day, trend lower higher atomic ratio coating. rates similar or...