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An analysis of the structural properties of three-dimensional Coulomb clusters confined in a spherical parabolic trap is presented. Based on extensive high-accuracy computer simulations the shell configurations and energies for particle numbers in the range 60 < or = N < or = 160 are reported. Further, the intrashell symmetry and the lowest metastable(More)
Electrical conductivities of nonideal carbon and zinc plasmas have been measured in this paper. The plasma is produced by vaporizing a wire placed in a glass capillary within some hundred nanoseconds. In the case of carbon, vaporization occurs with good reproducibility when utilizing a preheating system. The particle density is in the range of n=(1-10) x(More)
An analysis of strong coupling eeects in carrier-carrier scattering in electron-hole plasmas in semiconductors is presented. The conventional approach to scattering and dephasing rates is based on the Born approximation (scattering cross section proportional to the square of the dynamically screened interaction potential) and is strictly valid only in the(More)
Arcs moving due to Lorentz forces in gases in the range from normal to high pressure are used in several technical applications. A time-dependent 3D simulation solving the MHD (Magneto-hydrodynamic) equation system is applied here to study the behavior of a moving high-pressure arc in more detail. As examples, arcs in dry air and in SF6 gas rotating in a(More)
Summary form only given. Arcs moving due to Lorentz forces in gases in the range from normal to high pressure are used in several technical applications. A time-dependent 3D simulation solving the MHD equation system is applied here to study the behavior of a moving high-pressure arc in more detail. As an example, an arc in SF<sub>6</sub> gas at 3 bar(More)
This Master’s Thesis compares two computational fluid dynamics solvers: the commercial solver ANSYS CFX and the open source code OpenFOAM. Simple benchmark cases with compressible and incompressible flows are tested and compared. Thereafter the more complex process of quenching in coal gasification is simulated. This thesis work describes the simulation of(More)
Spherically symmetric three-dimensional charged particle clusters are analyzed experimentally and theoretically. Based on accurate molecular dynamics simulations ground state configurations and energies with clusters for N ≤ 160 are presented which correct previous results of Hasse and Avilov [Phys. Rev. A 44, 4506 (1991)]. A complete table is given in the(More)
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