A Computational Method in Plasma Physics

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Local Jobs Salary Estimator. Sign In. United States. United States Canada. Computational Plasma Physics jobs. Keywords Location. These deviations become increasing important for microplasmas, where one desires a reproducible breakdown voltage at small scale, and in microelectromechanical and nanoelectromechanical systems where one strives to avoid gas breakdown for device reliability. The drive toward even smaller electronics motivates a detailed analysis of all relevant electron emission mechanisms to optimize system design to either create or avoid plasma formation as applicable.

More recent studies have shown that further reducing gap size at a given pressure causes electron emission to transition from field emission to space-charge limited emission either with collisions Mott-Gurney or in vacuum Child-Langmuir.

Plasma Physics - Computational Mathematics Science and Engineering

Moreover, the importance of the electrode surface structure on gas breakdown increases for submicroscale gaps, particularly the nonuniform electric fields that arise due to field enhancement or surface roughness and the implications of multiple breakdown events on electrode surface structure and subsequent breakdown events. This further motivates the development of Monte Carlo and molecular dynamics simulations to assess the impact of collisions on electron emission and breakdown mechanisms at these small scales. This minicourse will provide a historical overview of the relevant breakdown and electron emission mechanisms, a theoretical perspective into their unification, and the implications of the transition between these mechanisms for various system parameters.

The talk will also discuss the role of Monte Carlo simulations in feeding crucial physical parameters to each of these models apart from elucidating the electron dynamics in non-traditional operating regimes. Moreover, the integration and assessment of ongoing experiments at microscale and nanoscale to the theory and the extension of these theories and models to AC fields, particularly at microwave and terahertz frequencies, will be discussed. Allen L. Garner received the B.

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He received an M. His research interests include the application of pulsed power and plasmas for studies of biodielectrics, gas breakdown at microscale and nanoscale, and directed energy technologies. He is a licensed Professional Engineer in Michigan. The x-ray radiation emitted by a non-LTE plasma can be used as a valuable tool for diagnosing its properties.

Consequently, this can require detailed atomic physics models and a radiation transport method. Diagnostically analysis will be presented using isocontours of line ratios and powers. Nicholas Ouart received the B. In , he joined the staff of NRL. His research interests include plasma diagnostics and x-ray spectroscopy, high-energy-density plasmas, and radiation transport.

This lecture will discuss issues and methods concerning the use of non-LTE kinetics in plasma modeling. Topics to be addressed will include characterization of plasma conditions for which non-LTE modeling is required and a survey of methods to fill that need. Radiation transport is often an important component of non-LTE modeling. The strong interactions between radiation and atomic kinetics produce strong numerical coupling, necessitating numerical methods tailored to reflect that coupling. Computational approaches for these coupled systems will also be discussed.

Lecture 4 (FDTD) -- Electromagnetics and FDTD

Howard Scott is a physicist at Lawrence Livermore National Laboratory, specializing in computational methods for non-LTE physics, radiation transport, plasma spectroscopy and large-scale simulations. He has authored or co-authored over refereed articles and multiple book chapters.

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  • He is the developer of the well-known non-LTE radiation transfer code Cretin. Howard received his Ph. He then worked in the light ion fusion program at Sandia National Laboratories for two years before returning to astrophysics as a visiting faculty member at Virginia Tech. There he became interested in numerical approaches to multiphysics problems and began a computational effort, originally aimed at modeling accretion disk spectra, to efficiently combine atomic physics, radiation transport and hydrodynamics. In , he brought those interests to LLNL where he has since applied them to numerous applications, including inertial confinement fusion, magnetic fusion, X-ray lasers, plasma spectroscopy, EUV lithography, and occasionally astrophysics.

    Fluid models of plasma can have an enormous advantage over fully kinetic methods, such as the particle-in-cell methods, in the speed of numerical computation as well as for interpreting the results of simulations and experiments.


    The main limitation of fluid models is their domain of validity is restricted to collision-dominated phenomena. Assuming this is the domain of interest, then the question of what physics should one include in a fluid model becomes critically important. The magneto-hydrodynamical MHD model is the simplest model that retains the conservation laws of mass, momentum, and energy when properly formulated, and for this reason it is widely used to model many plasma phenomena. It is even used in parameter regimes that are well outside of its domain of validity due to its computational simplicity.

    When one must use a model that goes beyond MHD, the question becomes: how does one extend the MHD model while still retaining the computational advantages of a fluid description and the MHD model in particular? However, including the physics of the Hall term can significantly increase the computational complexity and dramatically decrease the speed of the computation. For these reasons, progress in the development of robust HMHD computational models has been slow.

    In this talk I will introduce the Hall-MHD model and discuss the difficulties in the development of efficient methods. As the main focus of the talk, I will discuss a method that we have used with great success that is both computationally simple and efficient when compared to most other methods for simulating Hall physics. I will show results of relevance to the high-energy density plasma regime that exemplify the importance of the Hall physics.

    Upon receiving his Ph. He came to Cornell in starting in magnetic fusion, but over the years he developed an interest in ionospheric and magnetospheric plasma phenomena and then in high-energy density HED plasmas. Hirstoaga Published This manuscript assembles my contributions in developing new mathematical and computational methods for analyzing the dynamics of charged particles, like electrons or ions, as a multiscale phenomenon.

    The underlying mechanisms of this general physical problem are described by Vlasov--Poisson systems. The objective of this work is to study these equations and to implement various efficient numerical methods to approximate their solutions. View PDF. Save to Library.

    A Computational Method in Plasma Physics A Computational Method in Plasma Physics
    A Computational Method in Plasma Physics A Computational Method in Plasma Physics
    A Computational Method in Plasma Physics A Computational Method in Plasma Physics
    A Computational Method in Plasma Physics A Computational Method in Plasma Physics
    A Computational Method in Plasma Physics A Computational Method in Plasma Physics
    A Computational Method in Plasma Physics A Computational Method in Plasma Physics
    A Computational Method in Plasma Physics A Computational Method in Plasma Physics
    A Computational Method in Plasma Physics A Computational Method in Plasma Physics
    A Computational Method in Plasma Physics

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