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针对星光Ⅱ装置的实际条件,提出了以金箔背侧 X 光辐射作为样品加热源兼作背光源的特色自背光法,研究了辐射不透明度(自由程)实验方法。以波长为 0.35 μm,能量约 80 J,脉宽约 700 ps的强激光注入特色自背光靶,用空间分辨透射光栅配 X 光 CCD 由同一发打靶测得了半样品靶的源区、透射区和自发射区三区能谱分布图象,又由不同发次打靶分别测得了源谱、透射谱。样品材料为厚度 0.5 μm 和 1 μm,密度为 2.7 g/cm3的铝膜,以及密度为 0.042g/cm3,厚度为 42 μm 的碳氢发泡材料。实验由不同打靶发次测得的源谱和透射谱,初步获得了样品的谱分辨质量吸收系数,进而用空间分辨透射光栅谱仪、由同一发打靶获得了样品考虑自发射的谱分辨质量吸收系数。对样品温度、密度条件进行了相应的实验与理论研究。初步讨论了热碳元素辐射不透明度(Opacity)。
According to the actual conditions of the Star II device, a backlit method with backside X-ray radiation as the sample heating source and a backlight source was proposed. The experimental method of radiation opacity (free path) was studied. High intensity laser with a wavelength of 0.35 μm, energy of about 80 J and pulse width of about 700 ps was used to inject the characteristic self-backlighting target. The spatially resolved transmission grating was used to measure the source and transmission regions of the semi-sample target From the emission area three spectral distribution image, but also by different hair hit the target were measured source spectrum, transmission spectrum. The sample materials were aluminum films with thicknesses of 0.5 μm and 1 μm and a density of 2.7 g / cm 3, as well as hydrocarbon foams with a density of 0.042 g / cm 3 and a thickness of 42 μm. The spectral and mass absorption coefficients of the samples were obtained preliminarily from the source spectra and the transmission spectra measured by different shooting targets. Then the spatially resolved transmission grating spectrometer was used to obtain the spectral resolution mass absorption coefficient. The corresponding experimental and theoretical studies on the sample temperature and density conditions were carried out. A preliminary discussion of hot carbon radiopacity (Opacity).