X-ray Laser And Its Application - Probe Method To Measure The Plasma Electron Density Experimental Study

The development and application of X-ray laser is one of the significant forward projects in the laser science and technology today. X-ray lasers have widespread application foregrounds in many fields such as Physics, Biology, Chemistry, Materials Science and Initial Confinement Fusion (ICF), with their special features. The basis of applications is the output of X-ray laser with high brightness, high coherence, and good beam quality So it is a main aim and contents for studies to achieve X-ray laser. In this article, a demonstration of Ni-like Ag 13.9nm X-ray laser using electron collision excitated with henguan II high-power laser system is given. With prepulse and double-target-coupling techniques, saturation X-ray laser output will be achieved. We get definite X-ray laser output; however, the intensity is not high. 3jaJ energy is given using 10mm single target, which is good result for the target length, but there is no certain enhancement when using double-target-coupling. One of the reasons is the bad matching of two targets; the other reason is the line- focus system. The character of henguan II system laser intensity distribution make the focus-line, gained from cylinder lenses array system, be notable descent on the edge of focus-line, which can produce cool plasma. This can affect the X-ray laser intensity, the deflective angle, and the double-target-coupling condition. On the basis of experiments, by improving on the line-focus system, designing more instruments to diagnose plasma states, considering the actualization condition of prepulse and double-target-coupling, good results will be goften in next experiments. It is great significance for Initial Confinement Fusion (ICF) and X-ray laser studies to diagnose the electron density of high-temperature high-density plasma, which can verify the theory models and particle simulation programs. Laser probe is an important method to measure plasma electron density, then the higher density will be measured using X-ray laser as probe, so there is more application value. In this article, Ni-like Ag 13.9nm X-ray lasers are used as probe to diagnose Ta, Si laser plasma electron density, and moire stripes are used to measure light deflective angles. But perfect results are not gotten from this experiment. We get X-ray laserwire imaae, Ta,Si plasma radiation image and static moir stripe pattern, however, the dynamic moire stripe pattern which contains plasma information is not gotten. One of reason is the low intensity of X-ray laser output; the other reason is the strong plasmaradiation. If highet intensity of X-ray laser could be gotten, and lower radiation plasma is used as plasma object, it is possible to get perfect results.This thesis has been supported by Nation High Technology Program on the topic of X-ray laser...