SPS experiments with light particles

High energy physics during the last 20 years has utilized proton accelerators like the CERN PS. Now, however, fundamental questions can only be answered through experiments using beams of electrons, muons or neutrinos for the study of collisions between light particles or between light and heavy particles. The detection of light particles as the end products of interactions is also of great interest. The super protosynchrotron experimental programme which started in January 1977 is discussed with particular reference to the Big European Bubble Chamber (BEBC). (2 refs).