The Equations Of State And Spectrum Of Shock Compression Dense Argon Plasma

Shock compression generating plasma is the major process in the fusion physical procedure. Its equation of state (EOS) data is the important input parameters for computer simulation of fusion. The study of physical properties of shock compressed plasma with high-temperature and high-density has a clear background and scientific significance.Equation of state and spectrum studies of high-temperature dense plasma have been caused strong interest of people, not only because of the massive existence of plasma in the universe, but plasmas are generated in laboratory to observe new and amazing phenomena, and in our daily life plasmas are also used in many household appliances.The shock wave is one of the common means to generate plasma in laboratory. At present, the methods to producing strong shock waves in general can be divided into four: light gas gun, laser, magnetic drive, and high-explosive. Light gas gun driven flyer can product shock wave with good plane, the shock pressure and temperature are average, and the volume of shock compression plasma is large which with a few cubic centimeters, these advantages are good for plasma diagnosing. Therefore, we used the light gas gun as loading means, to generating high-temperature dense plasma. The argon plasma EOS data could be diagnosed by radiation pyrometer (PMT)+Doppler pins system (DPS)+optical multi-channel analyzer (OMA).Argon has a closed shell electronic structure, when get shocked, it is easily to transform into plasma with high temperature and high pressure, and it is suitable to test existing or new plasma theoretical models and plasma diagnostic techniques.This master thesis choosing the dense gas argon as the study object, researches of its equations of state and spectral diagnostic techniques are carried out. In this thesis three conclusions could be drawn:(1) The history of argon plasma optical radiation, the particle velocity profile, the radiation spectrum and LiF window Hugoniot states are obtained from the experiment, the computational model of a self-consistent fluid variation theory used to calculate the partial ionized plasma equation of state are verified.(2) The argon density for temperature at300K and pressure between0-60MPa are measured, and the second and third Virial coefficients are fitted from the experimental data. The Lennard-Jones potential parameters is re-calculated from our experimental Virial coefficients, comparison of our calculating result and other people’s experimental results had been done to ensure the available region of the new parameters.(3)The preliminary results and understandings of spectral experiment were obtained. As the pressure increasing, the absorption of the shock front gas experienced stages from transparent to selective absorption, and then continuous absorption. There are still many problems to diagnostic temperature which is higher than10 kK by using the radiation pyrometer and transient spectrum, and it is necessary to develop new techniques to measuring the high temperature.