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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Modeling of thermalization phenomena in coaxial plasma accelerators
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Modeling of thermalization phenomena in coaxial plasma accelerators

机译：同轴等离子体加速器中热化现象的建模

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Coaxial plasma accelerators are electromagnetic acceleration devices that employ a self-induced Lorentz force to produce collimated plasma jets with velocities similar to 50 km s(-1). The accelerator operation is characterized by the formation of an ionization/thermalization zone near gas inlet of the device that continually processes the incoming neutral gas into a highly ionized thermal plasma. In this paper, we present a 1D non-equilibrium plasma model to resolve the plasma formation and the electron-heavy species thermalization phenomena that take place in the thermalization zone. The non-equilibrium model is based on a self-consistent multi-species continuum description of the plasma with finite-rate chemistry. The thermalization zone is modelled by tracking a 1D gas-bit as it convects down the device with an initial gas pressure of 1 atm. The thermalization process occurs in two stages. The first is a plasma production stage, associated with a rapid increase in the charged species number densities facilitated by cathode surface electron emission and volumetric production processes. The production stage results in the formation of a two-temperature plasma with electron energies of similar to 2.5 eV in a low temperature background gas of similar to 300K. The second, a temperature equilibration stage, is characterized by the energy transfer between the electrons and heavy species. The characteristic length scale for thermalization is found to be comparable to axial length of the accelerator thus putting into question the equilibrium magnetohydrodynamics assumption used in modeling coaxial accelerators.
机译：同轴等离子体加速器是电磁加速装置，其采用自诱导的洛伦兹力，以产生具有类似于50km的速度的准直等离子体射流（-1）。加速器操作的特征在于在装置的气体入口附近形成电离/热化区，其连续地将进入的中性气体处理成高电离的热等离子体。在本文中，我们介绍了一种1D非平衡等离子体模型，以解决热化区中发生的等离子体形成和电子重物热化现象。非平衡模型基于具有有限速率化学的自我一致的多种多种血浆的连续描述。通过跟踪1D气体位的初始气体压力为1atm的装置，通过跟踪1D气体比特来建模热化区。热化过程发生在两个阶段。首先是等离子体生产阶段，与阴极表面电子发射和体积生产过程促进的带电物种数密度的快速增加相关。生产阶段导致在类似于300k的低温背景气体中形成两种温度的两种温度，其具有与2.5eV类似的电气能。第二种温度平衡阶段的特征在于电子和重物之间的能量传递。发现热化的特征长度尺度与加速器的轴向长度相当，因此投入了建模同轴促进剂的平衡磁流动动力学假设。

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