摘要
研究了一种对数螺线柱面晶体配接针孔对Z箍缩铝等离子体进行单色谱成像的摄谱成像仪,摄谱仪具有结构简单、外形尺寸紧凑的特点。由于对数螺线晶体的保角特性,摄谱成像仪可在较大视场范围内对Z箍缩内爆等离子体进行单色谱成像。在"阳"加速器上,针对Z箍缩铝等离子体K壳层的X射线辐射进行了成像实验,得到了铝丝阵内爆等离子体的类氢(1727.7eV)和类氦线(1588.3eV)单色图像。在箍缩单色图像上观察到了磁瑞利-泰勒不稳定性引起的"热点"及内爆不稳定性造成的螺旋形结构,反映了等离子体的内爆形态,为进一步理解Z箍缩物理过程和确定等离子体的辐射特性提供了参考。
A new type monochromatic X-ray crystal spectrograph which can be used to catch the K-shell line images of the imploding aluminum wire arrays was developed.The core component of the spectrograph is the crystal analyzer which was designed to the shape of logarithmic spiral in meridian plane.By taking advantages of the logarithmic spiral,monochromatic X-ray image of Z-pinch plasma can be obtained with the imager system in large field of view.Experiments have been carried on the ＂Yang＂ accelerator.In experiment,the hydrogenlike line（1727.7 eV） and heliumlike line（1588.3 eV） images of the imploding Al wire arrays were obtained.The results showed that the spectrograph can reflect the exploding modality of Z-pinch Al plasma,and multi-hot spots due to magnetic Rayleigh-Taylor instability also appeared on the images.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2012年第2期221-225,共5页
Chinese Journal of Lasers
基金
国家自然科学基金委员会和中国工程物理研究院联合基金(10976033)资助课题
关键词
X射线光学
摄谱成像仪
对数螺线晶体
Z箍缩
铝等离子体
单色谱成像
X-ray optics
X-ray spectrograph
logarithmic spiral crystal
Z-pinch
Al p lasma
monochromatic spectrum imaging
