Editing Van de Graaff generator (section)

=== Tandem accelerators ===
[[File:Nuclear accelerator in NCSR Demokritos.jpg|thumb|Van de Graaff Tandem accelerator at [[National Centre of Scientific Research "Demokritos"|NCSRD]] in Greece]]
Particle-beam Van de Graaff accelerators are often used in a "[[tandem accelerator|tandem]]" configuration with the high potential terminal located at the center of the machine. Negatively charged ions are injected at one end, where they are accelerated by attractive force toward the terminal. When the particles reach the terminal, they are stripped of some electrons to make them positively charged, and are subsequently accelerated by repulsive forces away from the terminal. This configuration results in two accelerations for the cost of one Van de Graaff generator and has the added advantage of leaving the ion source instrumentation accessible near ground potential.{{r|hinterberger}}