He also developed a , 730 MeV synchrocyclotron (1945). His department was responsible for the construction of their 600-MeV synchrocyclotron. He contributed to the development of the 184-inch synchrocyclotron and the 300 MeV electron synchrotron. There are two major differences between the synchrocyclotron and the classical cyclotron. The exhibition includes a video about the birth of CERN and the Synchrocyclotron. A Synchrocyclotron (as a general idea) was invented by Edwin McMillan in 1945. In 1956, Gentner was appointed Director of the Synchrocyclotron Department at CERN. The historically first approach was the synchrocyclotron, which accelerates the particles in bunches. It incorporated new ideas by Ed McMillan, and was completed as a synchrocyclotron. A group of six physicists formed the first experiment, using the Synchrocyclotron at CERN. The synchrocyclotron at CERN delivered its first beam on 1 August 1957. In May 1966, the Synchrocyclotron was shut down for major modifications.