A Hall-current ion source for generation of low and high energy ion beams with selection of magnetic fields and emission currents, where there are utilized low magnetic fields and high emission currents that are higher than discharge currents for low energy ion beams, 15-100 eV; high magnetic fields and emission currents that are equal to discharge currents are utilized for discharge voltages providing ion beam energies of 100-500 eV. Other measures are utilized for protection of a gas distribution area and a magnet from pinching by an ion beam penetration through a reflector by a buffer chamber providing better gas distribution in anode area, a protective ring in a center part of a reflector, and others.