First experiments on applying the gasdynamic ECR ion source for negative hydrogen ion productionR.L. Lapin, V.A. Skalyga, I.V. Izotov, S.V. Golubev, S.V. Razin and O. TarvainenEPJ Web Conf., 149 (2017) 02026DOI: https://doi.org/10.1051/epjconf/201714902026