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- Thomas Weiland
- 1996

In the eld of computational electrodynamics the discretization of Maxwell's equations using the Finite Integration Theory (FIT) yields very large, sparse, complex symmetric linear systems of equations. For this class of complex non-Hermitian systems a number of conjugate gradient-type algorithms is considered. The complex version of the biconjugate gradient… (More)

- Igor Zagorodnov, Rolf Schuhmann, Thomas Weiland
- J. Comput. Physics
- 2007

- Oliver Poděbrad, Markus Clemens, Thomas Weiland
- 2002

— A new flexible subgridding scheme for the Finite Integration Technique is presented, which can be applied for the numerical simulation of electromagnetic phenomena in static, time and frequency domains as well as for the eigenmode computation. Numerical simulations both in the static as well as in the high frequency regime are presented to give evidence… (More)

- C. Bommaraju, W. Ackermann, T. Weiland
- 2007 Workshop on Computational Electromagnetics…
- 2007

Adapted from 'Computational Fluid Dynamics', Finite Volume Time Domain (FVTD) method is becoming increasingly popular in 'Computational Electromagnetics'. The focus of this paper is on the convergence analysis of different FVTD methods on tetrahedral and hexahedral meshes. Other aspects like implementation techniques, CPU time and memory are also furnished.

- Herbert Egger, Fritz Kretzschmar, Sascha M. Schnepp, Thomas Weiland
- SIAM J. Scientific Computing
- 2015

The Yee finite-difference time domain method (FDTD) is commonly used in wake field and particle-in-cell simulations. However, in accelerator modeling the high energy particles can travel in vacuum faster than their own radiation. This effect is commonly referred to as numerical Cherenkov radiation and is a consequence of numerical grid dispersion. Several… (More)

- B. Doliwa, H. De Gersem, T. Weiland
- 2004

Within the design work of FAIR, beam-stability analyses play a important role. One relevant unknown is the beam response to the kicker modules. Here we report our numerical investigations of the respective longitudinal and transverse impedances, defined by Z || (ω) = 1 q 2 d 3 xE · J * ext Z x,y (ω) = i q 2 ∆ d 3 xρ ⊥ · (E x,y ∓ vB y,x), where the… (More)

- A. Novokhatski, M. Timm, T. Weiland
- 1998

In the Linear Colliders FEL projects ultra short bunches are foreseen to be used. In addition to usual wakefields, coming from irregularities in the chamber, these bunches excite fields in transporting lines and undulators due to the surface roughness. This effect can be large for the extruded tubes, usually used in accelerators. Based on computer results… (More)

- E. Gjonaj, T. Lau, T. Weiland
- 2007 International Conference on Electromagnetics…
- 2007

We investigate the conservation properties of the centered DO formulation for Maxwell equations. In particular, we state the problem and derive the criteria for charge conservation. It is shown that the centered scheme guarantees strict charge conservation for Cartesian discretizations with tensor product basis functions of arbitrary order. On unstructured… (More)

The optimization of continuous parameters in electrotechnical design using electromagnetic field simulation is already standard. In this paper, we present a new sequential modelling approach for mixed-integer simulation-based optimization. We apply the method for the optimization of integer-and real-valued geometrical parameters of the coils of a… (More)