Series of powerful CW gyrotrons in the range 105 – 140 GHzGregory Denisov, Igor Kazansky, Vladimir Malygin, Elena Soluyanova, Evgeny Tai and Aleksey ChirkovEPJ Web Conf., 147 (2017) 04003DOI: https://doi.org/10.1051/epjconf/201714704003