PIC Simulations of Ka-band Ultra-Short Pulse Oscillator with Resonance Cyclotron Absorber in the Feedback LoopN.S. Ginzburg, G.G. Denisov, M.N. Vilkov, I.V. Zotova, A.S. Sergeev, S.V. Samsonov, A. Marek and J. JelonnekEPJ Web Conf., 187 (2018) 01021DOI: https://doi.org/10.1051/epjconf/201818701021