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  • 1
    Electronic Resource
    Electronic Resource
    Spherical and cylindrical convergent shocks (1996)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 1041-1060 
    Details
    ISSN: 0392-6737
    Keywords: Compressible flows ; shock and detonation phenomena
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The converging shock wave is a classical example of self-similarity of the second kind, in which the similarity exponent δ* is found solving a non-linear eigenvalue problem. Work on this problem has been mostly concerned with the precise calculation of δ* for various adiabatic exponents γ. Data about asymptotic Mach numbers, compression ratios, and other properties of the solutions are very scarce and not sufficiently accurate. Profiles of the physical variables are available only for γ=7/5, 5/3 and are also inaccurate. To obtain the full solution with precision it is not enough to know the eigenvalue: additional independent requirements must also be met. In this paper we study in detail some properties of the solutions not yet discussed in the literature. We present new calculations of δ*, asymptotic Mach numbers and compression ratios for cylindrical and spherical shocks for many γ values; we present profiles of the physical variables, and find some striking properties of the solutions, previously unnoticed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457671
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  • 2
    Electronic Resource
    Electronic Resource
    Instability of the current sheath in plasma focus devices
    Amsterdam : Elsevier
    Physics Letters A 101 (1984), S. 261-262 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(84)90866-1
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  • 3
    Electronic Resource
    Electronic Resource
    Extension to high frequencies of a program for calculating the angular distribution of nonrelativistic bremsstrahlung
    Amsterdam : Elsevier
    Computer Physics Communications 35 (1984), S. C-556 
    Details
    ISSN: 0010-4655
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Computer Science , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0010-4655(84)82731-9
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  • 4
    Electronic Resource
    Electronic Resource
    Extension to high frequencies of a program for calculating the angular distribution of nonrelativistic bremsstrahlung
    Amsterdam : Elsevier
    Computer Physics Communications 17 (1979), S. 305-308 
    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(79)90057-2
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  • 5
    Electronic Resource
    Electronic Resource
    Radiation transport in an ionizing current sheath (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 4182-4187 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model describing the structure of a plane and stationary ionizing current sheath taking into account radiation transport is presented. Five fluid magnetohydrodynamic equations together with radiative transfer equations for continuous radiation (free–free and free–bound) are solved numerically in terms of the pressure of the neutral gas and the value of the pushing magnetic field behind the current sheath, with the assumption that the system becomes opaque for line radiation. Solutions are given for values of the parameters typical of plasma focus device operation [in Methods of Experimental Physics, edited by R. H. Louberg and H. R. Grien (Academic, New York, 1971), Vol. 9B, p. 187]. At a fixed value of the magnetic field, drastic changes in the opacity and in the intensity of the emerging radiant flux are found when varying the neutral gas pressure. In particular, radiative losses can be very high, reaching about 30% of the available power in a frame of reference moving with the current sheath.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865709
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  • 6
    Electronic Resource
    Electronic Resource
    A three-dimensional lagrangian method for fluid dynamics
    Amsterdam : Elsevier
    Journal of Computational Physics 91 (1990), S. 361-380 
    Details
    ISSN: 0021-9991
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Computer Science , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0021-9991(90)90042-Y
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  • 7
    Electronic Resource
    Electronic Resource
    2-D Code for Simulating a Hollow Gas Puff Z-Pinch (1997)
    Springer
    Astrophysics and space science 256 (1997), S. 459-465 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We compare the dynamics of plasma in a hollow gas puff Z-pinch device, obtained with Schlieren pictures, with the predictions of a 2-D MHD Lagrangian code. We show that agreement between the model and experiment require an axially variable line density and width of the injected gas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001169009211
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  • 8
    Electronic Resource
    Electronic Resource
    Optical Measurements in an Exploding Wire Experiment (1997)
    Springer
    Astrophysics and space science 256 (1997), S. 467-472 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present optical measurements (Shadow and Schlieren pictures) of a 12.5 Joule exploding wire experiment. After performing a large number of shots some sort of time evolution can be reconstructed from the pictures. The pictures were taken during the dark phase (zero current) and the plasma phase. Although the electrical signals are quite reproducible from shot to shot (allowing a good time correlation and indicating that the global dynamics is reproducible) we observed that the individual details are quite different, probably due to the non-uniformity of the wire. We observed a uniform expansion (the volume increases almost linearly with time) with the presence of surface instabilities and there is no evident difference in the density distribution between the dark and the plasma phases. Finally, we derive a mean radius and velocity evolution with time and an approximate energy balance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001134113638
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  • 9
    Electronic Resource
    Electronic Resource
    Numerical Study of the First Compression of a Two-Dimensional Pinch (1997)
    Springer
    Astrophysics and space science 256 (1997), S. 451-457 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For studying the first compression phase of a Plasma Focus machine, we developed a 2-fluid, time-dependent, 2-D code. The code includes two species (ions and electrons), two temperatures, radiation, thermal conductivity, electrical conductivity, magnetic diffusion, and viscosity and is coupled to an external circuit. In order to get reasonable initial conditions for the pinch phase, a simple 1-D model is used for the run-down phase. Under this somewhat ideal Plasma Focus discharge condition, relatively simple scaling laws are obtained. In particular, for a given machine, the pressure (po) of maximum thermonuclear production scales with the charging voltage (Vo) as po ∝ Vo 2; the thermonuclear production (Yn) at these pressures increases with the current (Io) as Yn ∝ Io 4 and the mean energy per particle is almost independent of all parameters (note that this means that the converging speed should be almost the same regardless of the machine at the optimum conditions). These laws show a reasonable agreement with experimental data and can be explained with a dimensional analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001162920907
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  • 10
    Electronic Resource
    Electronic Resource
    Detonation energy amplification in conical channels (2000)
    Springer
    Plasma physics reports 26 (2000), S. 203-218 
    Details
    ISSN: 1562-6938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A micro-Z-pinch has been recognized as a possible spark for the ignition of a dense D-T plasma [1–3]. The use of such a spark to ignite advanced fuels has been explored only superficially [4, 5]. In this paper, we address the problem of the transition between an ignited D-T plasma and a section of an advanced fuel such as D or D + He3. Some general rules are derived for the parameters of a conical channel of D-T that amplifies the spark energy to a level suitable for the ignition of a detonation wave in an inertially confined cylinder of highly compressed advanced fuel plasma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.952840
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