A particle accelerator is a device that uses electromagnetic fields to propel charged particles to high speeds and to contain them in well-defined There are two basic classes of accelerators, known as electrostatic and oscillating field accelerators. Accelerators use static electric fields to accelerate particles. An example of this class is the Cockcroft Walton generator. The high voltage generator of the Cockcroft-Walton accelerator is a well known cascade generator or voltage multiplier circuit. By using only capacitors and diodes, it can step up relatively low voltages to extremely high values, while at the same time being far lighter and cheaper than transformers. The first accelerator of this type was built in 1932 by J.D. Cockcroft and E.T. Walton. They achieved a high voltage of about 700 kV and they studied the first nuclear reaction with an accelerator. They shared the Nobel Prize in physics for 1951.The Cockcroft-Walton generator is discussed in this paper.