Theoretical Studies On Detailed Structure Of M-band And Ionization Stage For Laser-produced Plasmas

The spectra structure of M-band and the ion distribution of laser-produced plasma is very important for the research on the inertial confinement fusion(ICF). The knowledge of the detailed structure of M-band is the key to understand the atomic processes in plasma, and the ionization balance of highly ionized plasma is very important for the diagnostics of the high temperature fusion plasma. In this dissertation, we mainly study the spectra simulation, atomic processes and the ionization balance in the laser-produced plasma, and suggest the possible diagnostic method for plasma.First, the form factor of spectra line is discussed and the line form used in the spectra simulation is given. Then, the rate coefficients of many atomic process are calculated, and especially the rate coefficient for the autoionization and dielectronic recombination(DR) of many important ions, Ni-like, Cu-like, Zn-like, Ga-like and Ge-like Au and other ions, are computed by the unresolved transition array(UTA) method.The ionization potential of all ionized stage for Kr, Y, Nb, Mo, Ag, Pd, I, Gd, Dy, Lu, Ta, W, Ir, Au, Hg are calculated by the MCDF and HFR method, and the results are compared. The Saha model for local thermodynamical equilibrium(LTE) condition and collision radiation(CR) model for non-LTE is studied, the computation technique and the computer program are developed for these models.The program of computing band-like complex spectra of the plasma formed by heavy element material is developed, on the basis of relativistic calculation program of atomic structure (HFR) and the spin-orbit split transition array(SOSA) or unresolved transition array(UTA) model. Adding the Gaussian line factor to the computed spectra line, and combining with the ion and energy level distribution, the complex spectra of M-band is simulated. For the Au plasma that has experimentalresults, the detailed structure we obtained is in good agreement with the experimental one. And the simulated spectra for the Kr, Y, Pd, Ag, I, Lu and Hg plasma is reliable and useful for the future experimental research.The ion balance of Au plasma at different temperature and density is investigated, and we can reproduce the x-ray spectra for Au hohlraums plasmas very well. By simulating the experimental spectra, the plasma parameters can be inferred reliably, and the charge state distribution can be determined. The averaged ionization state obtained is in good agreement with the experimental result.The relationship between average charge state and the electron temperature is investigated in detail. In general, the average charge state increased with electron temperature, except between 3800eV and 3900eV. The above mentioned average charge state decreased region was first noticed, and we suggest that the possible reason for this unusual region is the ionization potential increased much sharply between Au 51 and Au52.For the He-like ion of Ar, the intensity ratio of satellite lines and the resonance line of DR process is calculated at different electronic temperature, and the ratio is recommended to diagnose the plasma. It is also discussed for the measurement of electronic temperature from the intensity ratio of two unresolved transition arrays comes from the same ion in Au plasma. Finally, we suggest that the intensity ratio of one unresolved transition arrays from a pair of different ions such as Ni-like Au and Cu-like Au, or Cu-like Au and Zn-like Au etc. can be used to diagnose plasma. And these ratios are very sensitive to the atomic thcrmodynamic processes, especially the ionization and dielectronic recombination process.