Stationary Negative Ion Beam Injector for a Tandem Accelerator

The results of the work of a new injector for a stationary beam of negative hydrogen ions, put into operation in 2022 at a tandem accelerator with vacuum insulation at the Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, are presented. The injector uses a surface plasma source (SPS) with a Penning discharge with massive heat-resistant electrodes and an internal permanent magnet magnetic system. Source power systems provide feedback and automated control of source operation according to a scenario selected by the operator. The source makes it possible to obtain stationary beams of negative hydrogen ions with a current of up to 15 mA and an energy of up to 32 keV. An additional magnetic lens is installed in the low-energy tract of the injector; to reduce stripping of the negative ion beam, pumping of the low-energy tract is enhanced.