Influence of initially filled Ar gas density oncapillary discharge-pumped soft X-ray laser

In this paper the simulation of the influence of initially filled Ar density on the plasma conditions and the gain coefficient of 3p-3s transition of Ne-like Ar ions in capillary discharge pumped soft X-ray laser is presented. The parameters of discharge generator，which is located in Harbin Institute of Technology are used in the simulation. The temporal evolvement of spatial distributions of capillary discharge produced plasma conditions and gain coefficient are shown. The results shows that the extension of Ar gas density which the gain can be got is sufficiently wide and it is very useful for experiment. Choosing the initial pressure of 40~80 Pa in capillary is the best for getting good results.