sentences:  Skinner and his team were in the process of building a synchrocyclotron accelerator and wanted to improve on existing technology by extracting the circulating beam to produce an external one, a feat which had never been accomplished.Skinner gave Crewe the responsibility for extracting the beam and he proved successful, using an innovative peeler-regenerator system.A few years later a team of physicists from the University of Chicago, sent by Enrico Fermi, went to Liverpool for help in solving a similar problem with the Chicago synchrocyclotron.