We describe a charged particle ( Z = 1 or 2) radiation system developed jointly by KM Sciences, The Naval Research Laboratory, and The Crocker Nuclear Laboratory. The system is used primarily to simulate the space environmental protons and other charged particles with energies from 10 to 70 MeV. These particles in turn produce single events in devices being tested. The system provides a highly reproducible beam combined with precise dosimetric measurement and control to better than 2% for fluences from 1 × 10 8 to 1 × 10 12 particles/cm 2. The system can also provide chopped single pulses with durations from 0.1 to 10 s at intensities up to 3 particles/cm 2s.