Investigation of phase transition processes arises from atomic and radiative property of plasmas for EUV and X-ray laser applications

本文从等离子体的原子性质和辐射性质出发，考虑了等离子体的相变过程，研究了激光等离子体和放电等离子体中非均匀结构的形成机理。我们开发了一个详细的原子模型的钨，这是感兴趣的聚变等离子体。模型的大小是参数化的，平均电荷和辐射功率损耗的计算精度提高了灵敏度研究和基准计算。我们还研究了放电等离子体中的逾渗转变。我们调查的发展放电SF6的基础上，其材料特性，如电离和附着系数再现实验观察从最初的局部放电到后来的成长的阶梯领导人，造成击穿。将原子模型、辐射传输模型和相变模型结合起来，将有助于更好地理解等离子体中结构的形成。

We investigate the mechanism of formation of the inhomogeneous structure in laser produced plasmas and discharge plasmas, by taking the phase transition processes into account, which originate from atomic and radiative properties of plasmas. We develop a detailed atomic model of tungsten, which is interested in fusion plasmas. The size of the model is parameterized, and accuracy of the calculation of mean charge and radiative power loss is improved by sensitivity studies and benchmark calculations. We also investigate percolation transition in discharge plasmas. We investigate development of discharge in SF6 based on its material properties such as ionization and attachment coefficient to reproduce experimental observations from initial partial discharge to later growth of the stepped leader to cause breakdown. By combining both atomic model, radiative transfer model and phase transition model understanding of structure formation in the plasmas will be improved.