Helmholtz Institute Freiberg for Resource Technology
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Macro to generate muon (g-2) summary plot
No full textThis macro gives the status of the muon (g-2) just after the FERMILAB seminar on April 7, 2021.
The theoretical values use the different contributions as given in the
[White Paper](https://arxiv.org/pdf/2006.04822.pdf) of the
[Theory Initiative](https://muon-gm2-theory.illinois.edu/). Since the leading
order hadronic contribution is dominating the uncertainty of the
theoretical values, several values for a are plotted which use the
different evaluations for the leading order hadronic contribution given in
Table 4 of the White Paper as well as the White Paper average
Data publication: A new system for real-time data acquisition and pulse parameterization for digital positron annihilation lifetime spectrometers with high repetition rates
No full textBei diesem Datensatz handelt es sich um die Bilder zur Publikation und Daten für die Leistungskurve
Data for: Bubble formation from sub-millimeter orifices: experimental analysis and modeling
No full textraw data and processed data for the publication
LDOS/SNAP data for MALA: Aluminium at 298K and 933K
No full textLDOS/SNAP data for MALA: Aluminium at 298K and 933K (liquid+solid).
Code development was done jointly by the authors.
The calculations have mainly been performed by:
DFT-MD snapshots / DFT calculations (LDOS data): N. A. Modine (at SNL)
SNAP data generation: A. P. Thompson (at SNL)
Neural network training: J. A. Ellis (ORNL, formerly SNL), G. A. Popoola (SNL), L. Fiedler (HZDR
HZDR Multiphase Addon for OpenFOAM
No full textThe HZDR multiphase addon contains additional code for the open-source CFD software OpenFOAM, released by The OpenFOAM Foundation. The developments are dedicated to the numerical simulation of multiphase flows, in particular to the multi-field two-fluid model (Euler-Euler method). Within the OpenFOAM library the multiphaseEulerFoam framework is used for this type of simulation. The addon contains a modified multiphaseEulerFoam named HZDRmultiphaseEulerFoam with the full support of the HZDR baseline model set for polydisperse bubbly flows according to Liao et al. (Chem Eng Sci, 2019, Vol. 202, 55-69). In addition a solver dedicated to a hybrid modelling approach (dispersed and resolved interfaces, Meller et al., Int J Numer Meth Fluids. 2021, Vol. 93, 748-773) named cipsaMultiphaseEulerFoam is provided with the addon. This solver has an interface to the multiphaseEulerFoam framework and utilizes all available interfacial models of it.
General enhancements
modified turbulent wall functions of Menter according to Rzehak and Kriebitzsch (Int J Multiphase Flow, 2015, Vol. 68, 135-152)
dynamic time step adjustment via PID controller
HZDRmultiphaseEulerFoam
bubble induced turbulence model of Ma et al. (Phys Rev Fluids, 2017, Vol. 2, 034301)
drag model of Ishii and Zuber (AIChE Journal, 1979, Vol. 25, 843-855) without correction for swarm and/or viscous effects
wall lubrication of Hosokawa et al. (ASME Joint US-European Fluids Engineering Division Conference, 2002)
additional breakup and coalescence models for class method according to Liao et al. (Chem Eng Sci, 2015, Vol. 122, 336-349)
degassing boundary condition (fvModel)
lift force correlation of Hessenkemper et al. (Int J Multiphase Flow, 2021, Vol. 138, 103587)
aspect ratio correlation of Ziegenhein and Lucas (Exp. Therm. Fluid Sci., 2017, Vol. 85, 248–256)
real pressure treatment via explicit turbulent normal stress according to Rzehak et al. (Nucl Eng Des., 2021, Vol. 374, 111079)
configuration files and tutorials for easy setup of baseline cases
cipsaMultiphaseEulerFoam
morphology adaptive modelling framework for predicting dispersed and resolved interfaces based on Eulerian multi-field two-fluid model
compact momentum interpolation method according to Cubero et al. (Comput Chem Eng, 2014, Vol. 62, 96-107), including virtual mass
numerical drag according to Strubelj and Tiselj (Int J Numer Methods Eng, 2011, Vol. 85, 575-590) to describe resolved interfaces in a volume-of-fluid like manner
n-phase partial elimination algorithm for momentum equations to resolve strong phase coupling (Meller et al., Int J Numer Meth Fluids. 2021, Vol. 93, 748-773)
free surface turbulence damping for k-ω SST (symmetric and asymmetric damping, Frederix et al., Nucl Eng Des, 2018, Vol. 333, 122-130)
sub-grid scale modelling framework:
additional LES models for the unclosed convective sub-grid scale term
closure models for sub-grid surface tension term
configuration files and tutorials for easy setup of hybrid casesThis work was supported by the Helmholtz European Partnering Program in the project "Crossing borders and scales (Crossing)
Data publication: Formation and time dynamics of hydrogen-induced vacancies in nickel
No full textDie Daten umfassen: - original-Daten für die zeitabhängige Messung der Positronen-Annihilations-Lebensdauer - Verwendete Ergebnisse der Daten-Analyse für die Publikatio
cupla - C++ User interface for the Platform Independent Library alpaka
No full textcupla [qχɑpˈlɑʔ] is a simple user interface for the platform independent parallel kernel acceleration library alpaka. It follows a similar concept as the NVIDIA® CUDA® API by providing a software layer to manage accelerator devices. alpaka is used as backend for cupla
Data for "Gold implanted germanium photoswitch for cavity dumping of a free-electron laser"
No full textMeasurements were carried out in ELBE 113 c lab. Free electron laser (FEL) pulses with a wavelength ranging from 6 to 90 µm from the FELBE laser operating at its maximum power level were used. Photoswitching of Ge and Ge:Au samples were carried out using a 1 kHz Ti:Sapphire Amplifier system at 800 nm. The data used in the paper is arranged in subfolders 1, 2, and 3. The description is as follows
1. Scheme of the experiment (used in Figure 1 and shows the idea of the experiment)
2. FEL pulse picking traces from photoswitched Ge and Ge: Au samples were recorded using an oscilloscope with 1 GHz bandwidth (Keysight InfiniiVision DSOX4104A).
Relevance: This data is used in Figures 2 and 3. This measurement showed the photoswitching attributes in both reflection and transmission geometry for the Ge and Ge: Au samples and suitability of Ge:Au sample for efficient cavity dumping.
3. Photoinduced reflectivity measurements for the Ge: Au sample as a function of the time delay between FEL pulses and the pulses from a kHz amplifier system is recorded. The fluence required to couple out FEL wavelengths with an efficiency of at least 50 % reflectivity and Matlab scripts used for simulation of photoinduced reflectivity for the same FEL wavelengths.
Relevance: This data is used in Figure 4 and shows the fluence requirements of the Ge:Au photoswitch and also a faster recovery time of sub-ns, much shorter than the FEL pulsing period of 77ns
Salt Effects on Formation and Stability of Colloidal Gas Aphrons Produced by Anionic and Zwitterionic Surfactants in Xanthan Gum Solution
No full textThis work is devoted to the influence of NaCl salt concentration on the formation and stability of colloidal gas aphrons (CGA) produced by the anionic surfactant sodium dodecyl sulfate (SDS) and zwitterionic surfactant coco amido propyl betaine (CAPB) in the presence of xanthan gum (XG) as a stabilizer. Dynamic surface tension measurements as well as volume and half-life time of the produced foams are considered for stability analysis. A sharp decrease of the half-life time and volume of the CGAs at NaCl concentrations larger than 20,000 ppm was observed, which was attributed to the precipitation of SDS in the solution. The mentioned SDS precipitation altered the dynamic surface tension behavior, dilational surface elasticity, and turbidity of the solution. The main reason for the precipitation of SDS is the increased Krafft point caused by the addition of salt. However, for the zwitterionic surfactant CAPB, the effects of added NaCl on the interfacial properties required for CGAs production was negligible due to the simultaneous effects on the cationic and anionic head groups in the CAPB leading to negligible changes in the net repulsion forces. Yet, an overall reduction in the half-life time of CGAs with increasing salt concentration, even when we have no precipitation, was observed for both surfactants, which could be explained by the reduction in the ability of XG to increase the viscosity with increasing salt concentration
PIConGPU setup: LPWFA downramp injection
No full textPIConGPU source code and setup files used for the LPWFA downramp injection simulation stud