Explanipedia

Screen-Printed PVDF Piezoelectric Pressure Transducer for Unsteadiness Study of Oblique Shock Wave Boundary Layer Interaction Open

Bei Wang, Cosimo Corsi, Thomas Weiland, Zhenyu Wang, Thomas Grund , et al. · 2024

Shock wave boundary/layer interactions (SWBLIs) are critical in high-speed aerodynamic flows, particularly within supersonic regimes, where unsteady dynamics can induce structural fatigue and degrade vehicle performance. Conventional measu…

Reformulation and generalisation of the air-gap element Open

Herbert De Gersem, Thomas Weiland · 2023

The air-gap macro element is reformulated such that rotation, rotor or stator skewing and rotor eccentricity can be incorporated easily. The air-gap element is evaluated using Fast Fourier Transforms which in combination with the Conjugate…

Astronomischer Almanach für Österreich 2024 Open

Georg Zotti, W. Vollmann, Herbert Raab, Alexander Pikhard, Thomas Weiland · 2023

Der AAÖ, eine Gemeinschaftsproduktion von Mitgliedern mehrerer Amateur-Astronomievereine, bietet seit 2020 auf Österreich abgestimmte astronomische Vorausberechnungen (Ephemeriden) der Positionen für Sonne, Mond und Planeten in Tabellenfor…

Transparent boundary condition for the calculation of eigenmodes in transversely infinite waveguides Open

Mikhail Patrushev, Wolfgang Ackermann, Thomas Weiland · 2020

Waveguides play one of the key figures in today's electronics and optics for signal transmission. Corresponding simulations of electromagnetic wave transportation along these waveguides are accomplished by discretization methods such as th…

Space-Time Discretization of Maxwell's Equations in the Setting of Geometric Algebra Open

Mariusz Klimek, Ulrich Römer, Sebastian Schöps, Thomas Weiland · 2018

In this dissertation a FIT-like discretisation of Maxwell's equations is performed directly in four-dimensional space-time using the mathematical formalism of Clifford's Geometric Algebra. The thesis extends the Finite Integration Techniqu…

A space-time approach for the time-domain simulation in a rotating reference frame Open

Mariusz Klimek, Stefan Kurz, Sebastian Schöps, Thomas Weiland · 2017

We approach the discretisation of Maxwell's equations directly in space-time without making any non-relativistic assumptions with the particular focus on simulations in rotating reference frames. As a research example we study Sagnac's eff…

A Space-Time Approach for the Time-Domain Simulation in a Rotating\n Reference Frame Open

Mariusz Klimek, Stefan Kurz, Sebastian Schöps, Thomas Weiland · 2017

We approach the discretisation of Maxwell's equations directly in space-time\nwithout making any non-relativistic assumptions with the particular focus on\nsimulations in rotating reference frames. As a research example we study\nSagnac's …

Electromagnetic simulators – status and future directions Open

Thomas Weiland · 2017

Electromagnetic simulators for all types of applications have matured to tools that are routinely used in industry and research. Over roughly five decades many different methods have been developed. Commercial solvers offer today a rich po…

Modeling of an electrically driven droplet generator Open

Yun Ouédraogo, Erion Gjonaj, Thomas Weiland, Herbert De Gersem, Christoph Steinhausen , et al. · 2017

An electrohydrodynamic model for the simulation of droplet formation, mo- \ntion and detachment in an electrically driven droplet generator is introduced. The nu- \nmerical approch is based on the coupled solution of the multiphase flow pr…

Eigenvalue Calculations Based on the Finite Element Method With Physically Motivated Field Smoothing Using the Kirchhoff Integral Open

Wolfgang Ackermann, Herbert De Gersem, Thomas Weiland · 2017

In current linear particle accelerators, the actual acceleration of the charged particles is realized with the help of the electric field strength within driven radio frequency resonators. The characterization and optimization of the appli…

Discretization of Maxwell's Equations for Non-inertial Observers Using\n Space-Time Algebra Open

Mariusz Klimek, Stefan Kurz, Sebastian Schoeps, Thomas Weiland · 2016

We employ Maxwell's equations formulated in Space-Time Algebra to perform\ndiscretization of moving geometries directly in space-time. All the derivations\nare carried out without any non-relativistic assumptions, thus the application\nare…

Discretization of Maxwell's Equations for Non-inertial Observers Using Space-Time Algebra Open

Mariusz Klimek, Stefan Kurz, Sebastian Schoeps, Thomas Weiland · 2016

We employ Maxwell's equations formulated in Space-Time Algebra to perform discretization of moving geometries directly in space-time. All the derivations are carried out without any non-relativistic assumptions, thus the application area o…

Analytical and numerical calculation of the second-order moment of the beam using a capacitive pickup Open

Joel Alain Tsemo Kamga, W. Müller, Thomas Weiland · 2016

Beam emittance has particular importance in particle physics, because it provides information about the quality of the particle beam. There are many techniques for measuring the beam emittance, such as that proposed by Miller et al. [Repor…

MESH OPTIMIZATION FOR MAXWELL'S EQUATIONS WITH RESPECT TO ANISOTROPIC MATERIALS USING GEOMETRIC ALGEBRA Open

Mariusz Klimek, Sebastian Schöps, Thomas Weiland · 2016

Clifford's Geometric Algebra provides an elegant formulation of Maxwell's equations in the space-time setting. Its clear geometric interpretation is used to derive a goal function, whose minimization results in Hodge-optimized material mat…

Modeling and Simulation of Photoemission Based Electron Sources Open

Ye Chen, Erion Gjonaj, Herbert De Gersem, Thomas Weiland, Mikhail Krassilnikov , et al. · 2016

The photoemission based electron source allows producing electron beams with controlled temporal and spatial profiles, high current and high brightness. Its development is critical to future short-wavelength light sources. To accurately ch…

Evaluation of the cone-shaped pickup performance for low charge sub-10 fs arrival-time measurements at free electron laser facilities Open

Aleksandar Angelovski, Michael Kuntzsch, Marie Kristin Czwalinna, Andreas Penirschke, Matthias Hansli , et al. · 2015

An evaluation of the cone-shaped pickup performance as a part of the high bandwidth bunch arrival-time monitors (BAMs) for a low charge sub-10 fs arrival-time measurements is presented. Three sets of pickups are installed at the free elect…

Measurement of the magnetic material properties for ferrite-loaded cavities Open

Klaus Klopfer, Uwe Niedermayer, Harald Klingbeil, Wolfgang Ackermann, Hans König , et al. · 2015

Measurements of the magnetic characteristics of the Ferroxcube 8C12m ferrite material in the parameter range where the GSI heavy-ion synchrotron SIS 18 cavity resonator is operated are presented. At first, the permeability is determined as…

A New Approach for Resistive Wakefield Calculations in Time Domain Open

Andranik Tsakanian, Herbert De Gersem, M. Dohlus, Erion Gjonaj, Thomas Weiland , et al. · 2015

We report on a new numerical technique for the computation of the wakefields excited by ultra-short bunches in the structures with walls of finite conductivity. The developed 3D numerical method is fully time domain. It is based on special…

Investigations of the Space-Charge-Limited Emission in the L-Band E-Xfel Photoinjector at Desy-Pitz Open

Ye Chen, Herbert De Gersem, Erion Gjonaj, Carlos Hernández-García, M. Krasilnikov , et al. · 2015

This paper discusses the numerical modelling of electron bunch emission for an L-band normal conducting RF photogun. The main objective is clarifying the discrepancies between measurements and simulations performed for the European X-ray F…

Investigation of thin-sheet approaches to simulate beam tube losses Open

Jens Trommler, Stephan Koch, Thomas Weiland · 2015

Eigenmode computation for the GSI SIS 18 ferrite cavity Open

Klaus Klopfer, Wolfgang Ackermann, Thomas Weiland · 2015

At the GSI Helmholtzzentrum fur Schwerionen- forschung in Darmstadt the heavy-ion synchrotron SIS18 is operated to further accelerate stable nuclei of elements with different atomic numbers. Two ferrite-loaded cavity resonators are install…

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