Relativistic fluid simulation of plasma-vacuum expansion with LTE closure

Buikstra, L. (2013) Relativistic fluid simulation of plasma-vacuum expansion with LTE closure.

Abstract:Neither kinetic numerical modeling nor widely available analytical models currently provide su�cient information on the timescale of interest for the plasma expansion phase in TNSA. In order to �ll this gap, this thesis introduces a uid approach to modeling plasmas that is easily implemented in simulations of arbitrary dimensions and can be used to simulate long timescale e�ects. The model has been implemented in a simulation that can simulate plasma expansion in arbitrary dimensionality. Section 2.1 introduces the general concepts of modeling collisionless plasmas as intersecting uids. First, the general description of collisionless plasmas by the Vlasov equation is given in section 2.1.1. Next, it is shown how equations describing the evolution of ensemble quantities like particle density, momentum density and energy density can be derived from the Vlasov equation in section 2.1.2. Next, the mechanics of TNSA are introduced along with its relation to laser intensity. Next, existing models for the plasma expansion phase are introduced, along with their assumptions and limitations. Finally, the theory section shows how the early stages of TNSA can be simulated using existing PIC codes. The methods section explains how the simulation using the LTE closure is built up in full. Section 4 discusses the veri�cation tests performed on the simulation code. Finally, in section 5 the simulation is used to investigate a simple one dimensional-expansion in comparison to the commonly used isothermal model. The di�erences between two-dimensional expansion and one-dimensional expansion are shown.
Item Type:Essay (Master)
HZDR Helmholtz-zentrum Dresden-Rossendorf, Dresden, Germany
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics MSc (60436)
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