Narrowband EUV Sc/Si Multilayer for the Solar Upper Transition Region Imager at 46.5 nm  

作　　者：Runze Qi Jiali Wu Jun Yu Chunling He Li Jiang Yue Yu Zhe Zhang Qiushi Huang Zhong Zhang Zhanshan Wang 

机构地区：[1]Key Laboratory of Advanced Micro-structured Materials,Ministry of Education,Tongji University,Shanghai 200092,China [2]Institute of Precision Optical Engineering,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China

出　　处：《Research in Astronomy and Astrophysics》2023年第10期210-217,共8页天文和天体物理学研究（英文版）

基　　金：funded by the National Natural Science Foundation of China (NSFC) under Nos. 12003016, 12204353and 62105244。

摘　　要：The transition region is the key region between the lower solar atmosphere and the corona, which has been limitedly understood by human beings. Therefore, the Solar Upper Transition Region Imager(SUTRI) was proposed by Chinese scientists and launched in 2022 July. Right now, the first imaging observation of the upper transition region around 46.5 nm has been carried out by SUTRI. To ensure the spectral and temporal resolution of the SUTRI telescope, we have developed a narrowband Sc/Si multilayer. Based on the extreme ultraviolet(EUV)reflectivity measurements, the multilayer structure has been modified for ensuring the peak position of reflectivity was at 46.5 nm. Finally, the narrowband Sc/Si multilayer was successfully deposited on the hyperboloid primary mirror and secondary mirrors. The deviation of multilayer thickness uniformity was below than 1%, and the average EUV reflectivity at 46.1 nm was 27.8% with a near-normal incident angle of 5°. The calculated bandwidth of the reflectivity curve after primary and secondary mirrors was 2.82 nm, which could ensure the requirements of spectral resolution and reflectivity of SUTRI telescope to achieve its scientific goals.

关 键 词：Astronomical Instrumentation Methods and Techniques instrumentation:high angular resolution Sun:UV radiation 

分 类 号：P111.41[天文地球—天文学]