Two-fluid electromagnetic simulations of plasma-jet acceleration with detailed equation-of-state

Thoma, C.; Welch, D. R.; Clark, R. E.; Bruner, N.; MacFarlane, J. J.; Golovkin, I. E.
October 2011
Physics of Plasmas;Oct2011, Vol. 18 Issue 10, p103507
Academic Journal
We describe a new particle-based two-fluid fully electromagnetic algorithm suitable for modeling high density (ni ∼ 1017 cm-3) and high Mach number laboratory plasma jets. In this parameter regime, traditional particle-in-cell (PIC) techniques are challenging due to electron timescale and lengthscale constraints. In this new approach, an implicit field solve allows the use of large timesteps while an Eulerian particle remap procedure allows simulations to be run with very few particles per cell. Hall physics and charge separation effects are included self-consistently. A detailed equation of state (EOS) model is used to evolve the ion charge state and introduce non-ideal gas behavior. Electron cooling due to radiation emission is included in the model as well. We demonstrate the use of these new algorithms in 1D and 2D Cartesian simulations of railgun (parallel plate) jet accelerators using He and Ar gases. The inclusion of EOS and radiation physics reduces the electron temperature, resulting in higher calculated jet Mach numbers in the simulations. We also introduce a surface physics model for jet accelerators in which a frictional drag along the walls leads to axial spreading of the emerging jet. The simulations demonstrate that high Mach number jets can be produced by railgun accelerators for a variety of applications, including high energy density physics experiments.


Related Articles

  • Particle-in-cell simulations of particle energization from low Mach number fast mode shocks. Park, Jaehong; Workman, Jared C.; Blackman, Eric G.; Ren, Chuang; Siller, Robert // Physics of Plasmas;Jun2012, Vol. 19 Issue 6, p062904 

    Astrophysical shocks are often studied in the high Mach number limit but weakly compressive fast shocks can occur in magnetic reconnection outflows and are considered to be a site of particle energization in solar flares. Here we study the microphysics of such perpendicular, low Mach number...

  • Ion dynamics at supercritical quasi-parallel shocks: Hybrid simulations. Su, Yanqing; Lu, Quanming; Gao, Xinliang; Huang, Can; Wang, Shui // Physics of Plasmas;Sep2012, Vol. 19 Issue 9, p092108 

    By separating the incident ions into directly transmitted, downstream thermalized, and diffuse ions, we perform one-dimensional (1D) hybrid simulations to investigate ion dynamics at a supercritical quasi-parallel shock. In the simulations, the angle between the upstream magnetic field and shock...

  • Theoretical Understanding of Enhanced Proton Energies from Laser-Cone Interactions. Kluge, T.; Gaillard, S. A.; Bussmann, M.; Flippo, K. A.; Burris-Mog, T.; Gall, B.; Geissel, M.; Kraft, S. D.; Lockard, T.; Metzkes, J.; Offermann, D. T.; Rassuchine, J.; Schollmeier, M.; Schramm, U.; Sentoku, Y.; Zeil, K.; Cowan, T. E. // AIP Conference Proceedings;11/5/2010, Vol. 1299 Issue 1, p715 

    For the past ten years, the highest proton energies accelerated with high-intensity lasers was 58 MeV, observed in 2000 at the LLNL NOVA Petawatt laser, using flat foil targets. Recently, 67.5 MeV protons were observed in experiments at the Los Alamos National Laboratory (LANL) Trident laser,...

  • Comparisons of Two Models for the Simulation of a DC Arc Plasma Torch. Huang, Renzhong; Fukanuma, Hirotaka; Uesugi, Yoshihiko; Tanaka, Yasunori // Journal of Thermal Spray Technology;Mar2013, Vol. 22 Issue 2/3, p183 

    The hypothesis of local thermal equilibrium (LTE) in thermal plasma has been widely accepted. Most of the simulation models for the arc plasma torch are based on the hypothesis of LTE and its results indicate good validity to mimic the pattern of plasma flow inside a plasma torch. However,...

  • Shocks in direct numerical simulation of the confined three-dimensional mixing layer. Vreman, Bert; Kuerten, Hans; Geurts, Bernard // Physics of Fluids;Sep95, Vol. 7 Issue 9, p2105 

    Examines the occurrence of shocks in the confined three-dimensional mixing layer at convective Mach number using direct numerical simulations. Orientation, shape and vortex structure of the shocks; Derivation of the shock jump relations for stationary inviscid flow.

  • Statistical Simulation of Micro-Cavity Flows. Jiang, Jian-Zheng; Fan, Jing; Shen, Ching // AIP Conference Proceedings;2003, Vol. 663 Issue 1, p784 

    Two particle approaches, namely the information preservation (IP) method and the direct simulation Monte Carlo (DSMC) method, are used to simulate micro-cavity gas flows at low Mach numbers. In the continuum regime, the velocity profiles given by the IP and DSMC methods agree well with the...

  • Analysis of internal micro-scale gas flows with pressure boundaries using the DSMC method. Wu, J.-S.; Tseng, K.-C. // AIP Conference Proceedings;2001, Vol. 585 Issue 1, p486 

    The development and applications of a two-dimensional DSMC (Direct Simulation Monte Carlo) program for pressure boundaries using unstructured cells and its applications to typical internal micro-scale gas flows, including a micromanifold, a micro-nozzle and a slider air bearing of computer hard...

  • Simulation studies of positron acceleration in a shock wave in a nonuniform external magnetic field. Iwata, Takashi; Takahashi, Seiichi; Ohsawa, Yukiharu // Physics of Plasmas;Feb2012, Vol. 19 Issue 2, p022302 

    Positron acceleration in a shock wave in an electron-positron-ion plasma is studied with one-dimensional, fully kinetic, electromagnetic particle simulations, with particular attention paid to the effect of inhomogeneity of external magnetic field B0. First, acceleration to γ ∼ 104,...

  • Summary Report of Working Group 3: High Gradient and Laser-Structure Based Acceleration. Solyak, N.; Cowan, B. M. // AIP Conference Proceedings;11/5/2010, Vol. 1299 Issue 1, p92 

    The charge for the working group on high gradient and laser-structure based acceleration was to assess the current challenges involved in developing an advanced accelerator based on electromagnetic structures, and survey state-of-the-art methods to address those challenges. The topics of more...


Read the Article


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

Try another library?
Sign out of this library

Other Topics