Powerful neutron generators based on high current ECR ion sources with gyrotron plasma heating V.A. Skalyga, S.V. Golubev, I.V. Izotov, R.L. Lapin, S.V. Razin, R.A. Shaposhnikov, S.V. Sidorov and O. Tarvainen EPJ Web Conf., 149 (2017) 01004 Published online: 04 August 2017 DOI: 10.1051/epjconf/201714901004