First experiments on applying the gasdynamic ECR ion source for negative hydrogen ion production R.L. Lapin, V.A. Skalyga, I.V. Izotov, S.V. Golubev, S.V. Razin and O. Tarvainen EPJ Web Conf., 149 (2017) 02026 Published online: 04 August 2017 DOI: 10.1051/epjconf/201714902026