“神光Ⅱ”基频光辐射输运实验与分析

Investigation of radiation transport experiments with a wavelength 1.053μm on `Shenguang Ⅱ' facilities

在“神光Ⅱ”激光装置上 ,利用首轮基频激光打靶实验 ,采用标准腔靶 ,通过软x射线谱仪测量腔的辐射温度 ,通过XRD测量x射线角分布 ;通过缩短腔靶提高腔的辐射温度 ,研究“神光Ⅱ”装置所能达到最大的辐射温度 ;在标准腔靶中部诊断口接输运管即T形靶 ,研究辐射输运的输运效率 .根据能量守恒定律和热波的自相似解 ,提出辐射输运的简化模型 ,并对实验结果进行了简要分析 .

The x-ray radiation generation in gold cylindrical cavities that were heated by `Shenguang Ⅱ' facilities laser light with a wavelength of 1.053μm has been experimentally investigated. The radiation temperature was measured using soft x-ray spectrometer (SXS). The angle distribution of x-ray was investigated with vacuum x-ray diode. In order to increase radiation temperature, the length of cylindrical cavity was shortened from 1600μm to 700μm, maximum radiation temperature that `Shenguang Ⅱ' can reach was studied. Radiation temperatures of 150eV for 1600μm long cavity and of 183 eV for 700μm long cavity were measured. With 1000μm cylindrical tube connected at the center of the 1600μm long cavity, transport efficiency of 34% was obtained by comparing flux from diagnostic hole with flux from the tube end. On the basis of energy conversion law and heat wave similarity solution, the simple model on radiation transport was put forward. The experimental results were analyzed using this model, and analysis basically agreed with the experiments.