TITLE

Bow shocks in ablated plasma streams for nested wire array z-pinches: A laboratory astrophysics testbed for radiatively cooled shocks

AUTHOR(S)
Ampleford, D. J.; Jennings, C. A.; Hall, G. N.; Lebedev, S. V.; Bland, S. N.; Bott, S. C.; Suzuki-Vidal, F.; Palmer, J. B. A.; Chittenden, J. P.; Cuneo, M. E.; Frank, A.; Blackman, E. G.; Ciardi, A.
PUB. DATE
May 2010
SOURCE
Physics of Plasmas;May2010, Vol. 17 Issue 5, p056315
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Astrophysical observations have demonstrated many examples of bow shocks, for example, the head of protostellar jets or supernova remnants passing through the interstellar medium or between discrete clumps in jets. For such systems where supersonic and super-Alfvénic flows and radiative cooling are all important, carefully scaled laboratory experiments can add insight into the physical processes involved. The early stage of a wire array z-pinch implosion consists of the steady ablation of material from fine metallic wires. Ablated material is accelerated toward the array axis by the J×B force. This flow is highly supersonic (M>5) and becomes super-Alfvénic (MA>2). Radiative cooling is significant in this flow and can be controlled by varying the material in the ablated plasma. The introduction of wires as obstructions in this steady flow leads to the formation of bow shocks, which can be used as a laboratory testbed for astrophysical bow shocks. The magnetic field associated with this obstruction wire can be controlled by varying the current through it. Differences in the shock for different cooling rates and different magnetic fields associated with the obstruction will be discussed, along with comparisons of dimensionless parameters in the experiments to astrophysical systems.
ACCESSION #
51059841

 

Related Articles

  • Production and Decay of Atomic Inner-Shell Vacancy States. Gorczyca, T. W. // AIP Conference Proceedings;2005, Vol. 774 Issue 1, p223 

    Our recent investigations on the accuracy of the existing 1s-vacancy fluorescence and Auger data base, which is crucial for the interpretation of spectra from X-ray photoionized plasmas and for supernova remnants under conditions of non-equilibrium ionization, is reviewed. In particular, effects...

  • Non-Equilibrium Distribution Functions in the Heliospheric Interface and Their Relaxation by Local Wave-Particle Interactions. Chashei, Igor V.; Fahr, Hans J.; Lay, Guenter // Solar Physics;Jan2005, Vol. 226 Issue 1, p163 

    The partially ionized local interstellar medium, before interacting with the heliospheric plasma on the upwind side, most probably undergoes an outer bow shock. After conversion into a sub-magnetosonic plasma flow, it then passes around the heliopause. While the ionized component at the bow...

  • Self-consistent Modelling of the interstellar medium. Breitschwerdt, Dieter // Astrophysics & Space Science;2004, Vol. 289 Issue 3/4, p489 

    The dynamical evolution of hot optically thin plasmas in the ISM crucially depends on the heating and cooling processes. It is essential to realize that all physical processes that contribute operate on different time scales. In particular detailed balancing is often violated since the...

  • Weakly compressible turbulence in local interstellar medium. Three-dimensional modeling using Large Eddy Simulation method. Chernyshov, Alexander A.; Karelsky, Kirill V.; Petrosyan, Arakel S. // AIP Conference Proceedings;6/14/2010, Vol. 1242 Issue 1, p197 

    Using advantages of large eddy simulation method, nontrivial regime of compressible magnetohydrodynamic turbulence of space plasma when initially supersonic fluctuations become weakly compressible is studied. Establishment of weakly compressible limit with Kolmogorov-like density fluctuations...

  • High-frequency extensions of magnetorotational instability in astrophysical plasmas. Mikhailovskii, A.; Lominadze, J.; Churikov, A.; Pustovitov, V.; Erokhin, N.; Tsypin, V.; Galv�o, R. // Plasma Physics Reports;Aug2008, Vol. 34 Issue 8, p678 

    High-frequency extensions of magnetorotational instability driven by the Velikhov effect beyond the standard magnetohydrodynamic (MHD) regime are studied. The existence of the well-known Hall regime and a new electron inertia regime is demonstrated. The electron inertia regime is realized for a...

  • Variational principles for stationary one- and two-fluid equilibria of axisymmetric laboratory and astrophysical plasmas. Goedbloed, J. P. // Physics of Plasmas;Dec2004, Vol. 11 Issue 12, pL81 

    It is shown that the core equations of both the magnetohydrodynamics and the two-fluid description of stationary axisymmetric equilibrium flows may be derived from variational principles in terms of the core variables of the respective descriptions. The latter replace the primitive variables...

  • Magnetic Rayleigh-Taylor instability mitigation and efficient radiation production in gas puff Z-pinch implosions. Sze, H.; Levine, J. S.; Banister, J.; Failor, B. H.; Qi, N.; Steen, P.; Velikovich, A. L.; Davis, J.; Wilson, A. // Physics of Plasmas;May2007, Vol. 14 Issue 5, p056307 

    Large radius Z-pinches are inherently susceptible to the magnetic Rayleigh-Taylor (RT) instability because of their relatively long acceleration path. This has been reflected in a significant reduction of the argon K-shell yield as was observed when the diameter of the load was increased from...

  • Ballooning mode stability in high β tokamaks with a q=1 magnetic island. Kieva, Robert G.; Guzdar, Parvez N. // Physics of Plasmas;Nov2004, Vol. 11 Issue 11, p4983 

    The secondary stability of ballooning modes in a high β tokamak plasma with a q=1 magnetic island is calculated numerically. As the island grows, the temperature gradient around the X point of the island steepens. Resistive ballooning modes grow more rapidly in the presence of the island, but...

  • Use of linear wire array Z pinches to examine plasma dynamics in high magnetic fields. Bland, S. N.; Lebedev, S. V.; Chittenden, J. P.; Ampleford, D. J.; Tang, G. // Physics of Plasmas;Nov2004, Vol. 11 Issue 11, p4911 

    Planar arrangements of tungsten wires, with a flat, closely positioned current return surface, were driven by the Magpie generator (1 MA,240 ns) [I. H. Mitchell et al., Rev. Sci. Instrum. 67, 1553 (1996)]. This “linear array” configuration was expected to increase the magnetic field...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics