黑腔靶辐射温度实验研究

Experimental research on radiation temperature for holhraums

研究腔靶辐射温度与靶型及激光辐照条件的关系 .实验利用神光 Ⅱ基频光 ,激光能量为 3— 5kJ 8束 ,脉宽为0 .6— 0 .9ns打Au腔靶 .采用滤片 x射线二极管 (XRD)阵列谱仪及平响应 x射线二极管 (P XRD)分别测量腔靶诊断口辐射软x射线强度谱及其角分布 ,给出了等效辐射温度为 14 0— 180eV .同时 ,利用多针孔时、空分辨成像技术 ,观测诊断口发射软x射线时空特性 ,实验现象表明两种诊断口 (衬Be环与无Be环 )在 16 0— 170eV辐射温度条件下 ,辐射烧蚀产生的等离子体云均对腔内发射x射线流形成一定程度的阻挡作用 ,数据处理结果 ,给出了相应条件下辐射温度推算中需要的等效诊断口面积修正因子 ,平均值为 0 .79,并用此数据对测量的软x射线强度谱进行修正 。

The dependence of radiation temperature on the target structures and laser irradiation conditions were investigated. Shenguang Ⅱ basic\|frequency laser with a wavelength 1.053μm, energy 3—5kJ/8 beams, pulse width 0.6—0.9ns was employed to irradiate gold cavity targets. The broadband soft x\|ray spectrometer and flat response x\|ray diffractor meter were used to measure the soft x\|ray spectrum and its angular distribution from the diagnostic hole on the cavity target. At the same time, the technology of temporal and spatial resolution image with five pinholes was used to observe the x\|rays emitted from the diagnostic hole on the cavity target, and then the effective area of the diagnostic hole was obtained. Meanwhile,the above soft x\|ray detection elements were calibrated by BSRF\|3W1B beam in the region of 0.05—1.50keV.