[en] A test facility designed and built for the investigation of ion sources, ion axial injection system and elements of electrostatic beam extraction system for the cyclotron type accelerators is described. The facility basic units and systems designed on the base of an electromagnet with the 50 cm pole diameter are described. The magnet field induction inside 120 mm high the working gap is 1.2 T. The vacuum chamber matches to a central region of the JINR phasotron. It is maintained by means of an oil-diffusion pump or by a magnetodischarge diode ion pump. The gas supply system includes a hydrogen separating device with a palladium filter. All other gas contaminations in pure hydrogen are less than 1x10^-7 percent. The power supply, control and data acquisition systems are also described