Development of supermirror telescope up to 80 keV
Development of supermirror telescope up to 80 keV
复制标题
研制高达80keV的超级镜面望远镜
DOI：
10.1117/12.461318
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
T. Okajima
中科院分区：
文献类型：
--
作者：
K. Tamura;K. Yamashita;Y. Tawara;Y. Ogasaka;Y. Satake;K. Nomoto;T. Okajima
我们一直在研制深度渐变多层膜硬X射线望远镜。在2001年7月发射的气球实验中，我们获得了天鹅座X-1在20-40 keV能带的硬X射线图像。我们正试图通过优化超反射镜的设计，将X射线望远镜的能带扩展到80 keV。超反射镜的设计应实现高反射率和平坦响应。此外，为了多层膜的质量和制造工艺，双层膜的总数必须小于200。在这样的高能量区（~80 keV），界面粗糙度是严重的问题。在实际应用中，界面粗糙度必须小于0.3nm。在我们的气球实验中，超反射镜的平均界面粗糙度约为0.38 nm。我们尝试用离子束溅射法改善铂碳多层膜的界面粗糙度。
We have been developing the hard X-ray telescope using depth graded multilayer. In our balloon experiment launched in 2001 July, we obtained hard X-ray image of Cygnus X-1 in 20-40 keV energy band. We are trying to expand the energy band of X-ray telescope up to 80 keV by optimizing supermirror design. Design of supermirror should achieve high reflectivity and flat response. Moreover, total number of bilayers have to be smaller than 200 for quality of multilayer and fabrication process. In such high energy region (~80 keV), interfacial roughness is serious problem. In practical use, interfacial roughness has to be smaller than 0.3 nm. In our balloon borne experiment, average interfacial roughness of supermirror is about 0.38 nm. We try to improve interface roughness of platinum-carbon multilayer with ion beam sputtering.