[en] Problems of developing electrodes of ion-optical systems (IOS) of stationary multiampere ion sources (IS) of megawatt deuterium atom beam injectors for thermonuclear reactars were considered. Selection of IOS element materials was substantiated. Technologie fabrication electrodes of pulse (10-300 As) and stationary IS and IS element soldering with solders containing no silver were considered as well. Ways for producing profile elements (solid and hollow) from round blanks and for eliminating defects of hollow profiles by the tungsten precipitation method from gas phase are described Reliability of IOS electrodes of 4604 molybdenum alloy under conditions of the ion source of the IBM and IPM types with 30-100 A current and 10-25 keV energy in the T-11, Ogra-3, Ogra-4 thermonuclear facilities and in ipjectors of powerful neutral beams has proved experimentally