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  • 1
    Electronic Resource
    Electronic Resource
    Zur Berechnung der Wirbelströme in beliebig geformten, lamellierten, dreidimensionalen Eisenkörpern (1979)
    Springer
    Electrical engineering 61 (1979), S. 103-109 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents A computer-program is described, that builds up and solves the system of complex, linear equations of a finite-difference-method. — This program enables the user to calculate and plot the distribution of magnetic fields, electric fields and eddy-currents in arbitrarily shaped, three-dimensional, laminated iron-cores.
    Notes: Übersicht Es wird ein Rechenprogramm beschrieben, das das komplexe Gleichungssystem einer Differenzenmethode aufstellt und iterativ löst. — Mit Hilfe dieses Programmes ist es möglich, die Verteilung der elektrischen und magnetischen Feldstärken und damit auch der Wirbelströme in dreidimensionalen, beliebig geformten, lamellierten Eisenkörpern zu berechnen und graphisch darzustellen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01580213
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  • 2
    Electronic Resource
    Electronic Resource
    Numerical solution of 2- or 3-dimensional nonlinear field problems by means of the computer program PROFI (1982)
    Springer
    Electrical engineering 65 (1982), S. 299-307 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Übersicht Es werden die Umrisse des Rechenprogrammes PROFI beschrieben, welches zwei- oder dreidimensionale nichtlineare magnetostatische Felder, lineare elektrostatische oder stationäre elektrische Felder, stationäre nichtlineare zweidimensionale Wirbelstromfelder und stationäre Temperaturfelder berechnet. Das Programm benutzt die Methode der finiten Differenzen. Die Rechnungen können wahlweise in einem von fünf verschiedenen Koordinatensystemen ausgeführt werden, von denen zwei dreidimensional sind. Die Benutzung des Programmes wird durch Hilfsprogramme zur Aufbereitung der Eingabedaten, zur Analyse der Ergebnisse und zur Datenverwaltung erleichtert.
    Notes: Contents The paper describes the outlines of the computer program PROFI (program for calculation of fields) which calculates 2- or 3-dimensional nonlinear magnetostatic fields, linear electrostatic or stationary electric fields, stationary nonlinear 2-dimensional eddy-current fields and stationary temperature distributions. The program uses the finite difference method. The calculations may be carried out in one of five different coordinate systems, two of them being 3-dimensional. A set of service programs for preparing the input data, analysing the results, data handling etc. simplifies the use of the program.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01452154
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  • 3
    Electronic Resource
    Electronic Resource
    Non-nested geometric multigrid method using consistency error correction for discrete magnetic curl-curl formulations (2004)
    Bradford : Emerald
    Compel 23 (2004), S. 913-922 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: The simulation of magnetic fields with geometric discretization schemes using magnetic vector potentials involves the solution of very large discrete consistently singular curl-curl systems of equations. Geometric and algebraic multigrid schemes for their solution require intergrid transfer operators of restriction and prolongation that achieve the discrete conservation of integral quantities serving as state-variables of geometric discretization methods. For non-conservative restriction operations, a consistency error correction operator related to an algebraic filtering is proposed. Numerical results show the effects of the consistency correction for a non-nested geometric multigrid method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321640410553346
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  • 4
    Electronic Resource
    Electronic Resource
    Solution of Maxwell's equations
    Amsterdam : Elsevier
    Computer Physics Communications 73 (1992), S. 22-39 
    Details
    ISSN: 0010-4655
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Computer Science , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0010-4655(92)90026-U
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  • 5
    Electronic Resource
    Electronic Resource
    Ab initio numerical simulation of left-handed metamaterials: Comparison of calculations and experiments (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 5419-5424 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using numerical simulation techniques, the transmission and reflection coefficients, or S parameters, for left-handed metamaterials are calculated. Metamaterials consist of a lattice of conducting, nonmagnetic elements that can be described by an effective magnetic permeability μeff and an effective electrical permittivity cursive-epsiloneff, both of which can exhibit values not found in naturally occurring materials. Because the electromagnetic fields in conducting metamaterials can be localized to regions much smaller than the incident wavelength, it can be difficult to perform accurate numerical simulations. The metamaterials simulated here, for example, are based on arrays of split ring resonators (SRRs), which produce enhanced and highly localized electric fields within the gaps of the elements in response to applied time dependent fields. To obtain greater numerical accuracy we utilize the newly developed commercially available code MICROWAVE STUDIO, which is based on the finite integration technique with the perfect boundary approximation. The simulation results are in agreement with published experimental results for the frequencies and bandwidths of the propagation and stop bands associated with the various structures. We further analyze the properties of an individual SRR, and find the dependence of the resonant frequency on the SRR radius, ring thickness, inner/outer radial gap, azimuthal gap, electrical permittivity, and magnetic permeability of the components' materials. Comparison with previously published analytical estimates shows only approximate agreement with the simulation results. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1410881
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  • 6
    Electronic Resource
    Electronic Resource
    Thomson scattering from laser plasmas : The 40th annual meeting of the division of plasma physics of the american physical society (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 2117-2128 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thomson scattering has recently been introduced as a fundamental diagnostic of plasma conditions and basic physical processes in dense, inertial confinement fusion plasmas. Experiments at the Nova laser facility [E. M. Campbell et al., Laser Part. Beams 9, 209 (1991)] have demonstrated accurate temporally and spatially resolved characterization of densities, electron temperatures, and average ionization levels by simultaneously observing Thomson scattered light from ion acoustic and electron plasma (Langmuir) fluctuations. In addition, observations of fast and slow ion acoustic waves in two-ion species plasmas have also allowed an independent measurement of the ion temperature. These results have motivated the application of Thomson scattering in closed-geometry inertial confinement fusion hohlraums to benchmark integrated radiation-hydrodynamic modeling of fusion plasmas. For this purpose a high energy 4ω probe laser was implemented recently allowing ultraviolet Thomson scattering at various locations in high-density gas-filled hohlraum plasmas. In particular, the observation of steep electron temperature gradients indicates that electron thermal transport is inhibited in these gas-filled hohlraums. Hydrodynamic calculations which include an exact treatment of large-scale magnetic fields are in agreement with these findings. Moreover, the Thomson scattering data clearly indicate axial stagnation in these hohlraums by showing a fast rise of the ion temperature. Its timing is in good agreement with calculations indicating that the stagnating plasma will not deteriorate the implosion of the fusion capsules in ignition experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873499
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  • 7
    Electronic Resource
    Electronic Resource
    Improved gas-filled hohlraum performance on Nova with beam smoothing : The 39th annual meeting of division of plasma physics of APS (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 1927-1934 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Gas-filled hohlraums are presently the base line ignition target design for the National Ignition Facility. Initial Nova [E. M. Campbell et al. Rev. Sci. Instrum. 57, 2101 (1986).] experiments on gas-filled hohlraums showed that radiation temperature was reduced due to stimulated Brillouin and stimulated Raman scattering losses and that implosion symmetry had shifted compared with vacuum hohlraums and calculations. Subsequent single beam experiments imaging thermal x-ray emission showed the shift is due to laser–plasma heating dynamics and filamentation in a flowing plasma. Experiments using a single beam have shown that scattering losses and effects of filamentation are reduced when the beam is spatially smoothed with a random phase plate or kinoform phase plate. Scattering is further reduced to less than 5% of the incident laser energy when temporal smoothing is added.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872822
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  • 8
    Electronic Resource
    Electronic Resource
    Hohlraum symmetry measurements with surrogate solid targets (invited) : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 536-542 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Time-resolved radiographic imaging of low density, solid spherical surrogate targets has been used to provide a time-dependent measurement of drive pressure symmetry in cylindrical hohlraums on both the Nova and Omega lasers. The experiments replace the usual capsule at the center of a gold hohlraum with a sphere of SiO2 foam (ρ=0.3 g/cm3). The laser generates an x-ray drive inside the hohlraum which does not produce perfectly symmetric drive pressure on a spherical target, giving rise to a distorted shock traveling radially inward. The rarefaction behind the shock generated in this sphere produces a rapid rise in x-ray transmission which is easily detectable experimentally by radiography. The position of this feature may be determined to within a few microns in our experimental setup using a gated x-ray pinhole camera. Time-dependent control of drive symmetry in a hohlraum requires the ability to adjust the laser power as a function of both time and position along the hohlraum axis. We have implemented this control on the Omega laser by delaying sets of beams ("beam staggering") and on the Nova laser ("beam phasing") by delivering two independent pulse shapes on inner and outer halves of the Nova beams. The improvement in P2 pressure symmetry with this control as measured with the foam ball technique was found to be as much as a factor of 3, compared with deliberately mistuned drives. On the National Ignition Facility (NIF), we expect to use this technique as part of the effort to tune drive symmetry to achieve higher gain. We present results from these experiments from both facilities and comparisons with LASNEX simulations. In addition, we discuss the application of the foam ball technique to NIF targets. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149358
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  • 9
    Electronic Resource
    Electronic Resource
    High-energy 4ω probe laser for laser-plasma experiments at Nova : Proceedings of the 12th topical conference on high temperature plasma diagnostics (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 1089-1092 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: For the characterization of inertial confinement fusion plasmas, we implemented a high-energy 4ω probe laser at the Nova laser facility. A total energy of 〉50 J at 4ω, a focal spot size of order 100 μm, and a pointing accuracy of 100 μm was demonstrated for target shots. This laser provides intensities of up to 3×1014 W cm−2 and therefore fulfills high-power requirements for laser-plasma interaction experiments. The 4ω probe laser is now routinely used for Thomson scattering. Successful experiments were performed in gas-filled hohlraums at electron densities of ne〉2×1021 cm−3 which represents the highest density plasma so far being diagnosed with Thomson scattering. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149513
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  • 10
    Electronic Resource
    Electronic Resource
    Three-dimensional RF structure calculations
    Amsterdam : Elsevier
    Nuclear Inst. and Methods in Physics Research, B 40-41 (1989), S. 959-964 
    Details
    ISSN: 0168-583X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-583X(89)90516-8
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