Irradiation study of liquid crystal variable retarder for Full-disk Magneto-Graph payload onboard ASO-S mission  

作　　者：Jun-Feng Hou Hai-Feng Wang Gang Wang Yong-Quan Luo Hong-Wei Li Zhen-Long Zhang Dong-Guang Wang Yuan-Yong Deng 侯俊峰;王海峰;王刚;骆永全;李宏伟;张振龙;王东光;邓元勇(Key Laboratory of Solar Activity,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China;National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 101408,China)

机构地区：[1]Key Laboratory of Solar Activity,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [2]Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China [3]National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China [4]School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 101408,China

出　　处：《Chinese Physics B》2020年第7期346-355,共10页中国物理B（英文版）

基　　金：Project supported by the Strategic Pioneer Program on Space Science,Chinese Academy of Sciences(Grant Nos.XDA15010800 and XDA15320102);the National Natural Science Foundation of China(Grant Nos.11427901,11773040,11403047,and 11427803).

摘　　要：The Advanced Space-based Solar Observatory(ASO-S)is a mission proposed by the Chinese Solar Physics Community.As one of the three payloads of ASO-S,the Full-disc Magneto-Graph(FMG)will measure the photospheric magnetic fields of the entire solar disk with high spatial and temporal resolution,and high magnetic sensitivity,where liquid crystal variable retarder(LCVR)is the key to whether FMG can achieve its scientific goal.So far,there is no space flight experience for LCVR.Therefore,irradiation study for LCVRs becomes more important and urgent in order to make sure their safety and reliability in space application.In this paper,γirradiation,proton irradiation,and ultra-violet(UV)irradiation are tested for LCVRs respectively.The optical and chemical properties during irradiation tests are measured and analyzed.For optical properties,there is no significant change in those parameters FMG payload concerned except the retardation.Although there is no drastic degradation in the retardation versus voltage during irradiations,the amount of retardation variation is much higher than the instrument requirements.Thus,an in-flight retardation versus voltage should be added in FMG payload,reducing or even avoiding the impact of retardation change.For chemical properties,the clearing point and birefringence of the LC materials almost have no change;the ion density dose not change below 60 krad[Si],but begin to increase dramatically above 60 krad[Si].

关 键 词：solar telescope liquid crystal variable retarder(LCVR) IRRADIATION 

分 类 号：P111.41[天文地球—天文学] TM914.4[电气工程—电力电子与电力传动]