Temporal growth rate study of a high power backward wave oscillator with semi-circularly corrugated slow wave structureMd. Ghulam Saber, Rakibul Hasan Sagor and Md. Ruhul AminEur. Phys. J. Appl. Phys., 70 2 (2015) 20801DOI: https://doi.org/10.1051/epjap/2015150034