Space environment experiments of SiC/Mg multilayer for astronomical observation

Details Space environment experiments of SiC/Mg multilayer for astronomical observation Space environment experiments of SiC/Mg multilayer for astronomical observation

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spie.7437e..61z&link_type=abstract

Optics for EUV, X-Ray, and Gamma-Ray Astronomy IV. Edited by Zhu, Jingtao; Li, Haochuan; Bai, Liang; Huang, Qiushi; Tan, Moyan;

Physics

Optics

Scientific paper

SiC/Mg, Mo/Si and SiC/Si period multilayer mirrors were developed for solar He-II radiation at 30.4 nm. The optical stabilities of the SiC/Mg multilayer were investigated before and after space environment simulation tests for the purpose of potential application in space extreme ultraviolet observation. The multilayers are deposited by using direct current magnetron sputtering method in Ar gas atmosphere on polished fused silica substrate. Then, the reflectivities were measured at synchrotron radiation. The SiC/Mg multilayer provides the highest reflectivity of 34.0%, only 18.6% and 13.9% for Mo/Si and SiC/Si multilayer mirrors. However, Mg is known to be highly reactive and low melting point. Therefore, the thermal cycling stability test and radiation exposure experiments were performed for SiC/Mg multilayer to simulate the space environment, respectively. The testing results indicate that the reflectivity of SiC/Mg multilayer decreases slightly. After thermal cycling from -45 to 145 Celsius degree three times, the reflectivity decrease from 34.0% to 31.0%. After gamma radiation exposure, the reflectivity decreases from 31.4% to 29.4%.

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