We present the results of the study of activated hydrogen, desorbed from a metal hydride cathode, effect on a PIG ability to emit negative hydrogen ions H- in the longitudinal direction. It becomes possible due to a change in the discharge properties with the further output of negatively charged particles together with positive ions along the magnetic field. The separation of negative ions from an extracted flow of charged particles was carried out by an electromagnetic filter. The efficiency of the filter was investigated and the optimal external parameters for H- ions separation were determined. The beam current of ions has been obtained at the level of 5 mkA at an average discharge current 2 mA and a discharge voltage 5 kV. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.