sentences:  For this purpose, the first hadron calorimeter was developed and optimised by Monte Carlo simulations.Another group at Karlsruhe developed the first superconducting high frequency cavities in Europe, a technology which was transferred to CERN for particle separators and later for particle acceleration at LEP.At CERN, he was a Research Associate in 1966-67, became Division Leader of the Nuclear Physics Division in 1970, member of the Directorate responsible for the Co-ordination of the Experimental Programme until 1973 and Chairman of the ISR Committee from 1973 to 1976.