The 30-kV proton injector for PIGMI

A 30 kV proton injector designed for matching a 31 mA proton beam into the radio frequency quadrupole (RFQ) section of the PIGMI (pion generator for medical irradiation) accelerator was constructed and tested. This injector uses a small efficient duoplasmatron ion source and a single gap extraction system for creating a convergent ion beam, and a three element unipotential einzel lens for focusing the ion beam into the RFQ. A description of this prototype injector is presented, along with the experimental data obtained during the testing of the system.