English: Cockcroft-Walton voltage multiplier circuit, also called the Greinacher multiplier. When an alternating voltage is applied, it produces a DC output voltage equal to V_o = 2NV_p = NV_pp where V_pp is the peak-to-peak input voltage and N is the number of stages. This diagram shows a 4 stage circuit, with output V_o = 4V_ip It was invented in 1932 by physicists John Douglas Cockcroft and Ernest Thomas Sinton Walton. The Cockcroft-Walton circuit is widely used to produce high voltages in CRT television set anode supplies, photomultiplier tube power supplies, copiers, laser printers, electrostatic precipitators, and Cockcroft-Walton particle accelerators