Rayleigh scattering measurement of residual gas inside microwave vacuum electronic devices - Yuan, Hui-yu; Wu, Chen; Wang, Feng; Bai, Ningfeng; Fan, Hehong; Wei, Pu; Zhao, Xinqun; Sun, Xiao-han (2013 IEEE 14th International Vacuum Electronics Conference (IVEC), Vacuum Electronics Conference (IVEC), 2013 IEEE 14th International, 2013)