Characteristics of emission spectroscopyof radiatively heated Al plasma
辐射输运实验中的Al等离子体发射光谱研究

The X-ray spectrum of radiatively heated tracer Al in the doped foam was recorded by using a flat crystal spectrometer. The radiation thermal bath with a peak temperature of 150 eV is created inside the hohlraum irradiated by 8 laser beams, each delivering 250J. From the measured spectrum, we have observed that the intensities of jkl Li-like satellite were smaller than those of qr Li-like satellites, which is not a case usually encountered in electron collision dominated low density plasmas. The analyses of various generation and loss channels of doubly excited states indicate that in the radiatively heated plasma considered in the present work, the photo excitation and the photo ionization processes are fully responsible for the generation of doubly excited states instead of dielectronic recombination. Besides the satellite features, intercombination lines are also observed which imply the existence of a low density plasma region. Finally, we compare the calculated spectrum with the measured spectrum, and find that they are in fairly good agreement was achiered.