Completed in 1970, the Tandem Van de Graaff facility was for many years the world's largest electrostatic accelerator facility. It can provide researchers with beams of more than 40 different types of ions - atoms that have been stripped of their electrons. Ions ranging from hydrogen to uranium are available. The facility consists of two 15 million volt electrostatic accelerators, each about 24 meters long, aligned end-to-end.