The diagnostic neutral beam injector based on arc-discharge plasma source with LaB6 hollow cathode is described.

The ion source of the diagnostic injector provides a proton beam with a current up to 2.5A, the particle energy up to 50 keV, the beam divergence is ~0.5°. The beam species at the 2 A ion current are: H+-83%, H2+-5%, H3+-12%. The injector was tested at pulse duration up to 2 seconds.