Linear Accelerator Laboratory -Progress report 1990-1991

During the last two years, physics experiments at LAL have focused towards new lines: end of fixed target experiments, continuity of underground physics, high activity of physics in collisions, opening towards astrophysics. Two experiments have reached their final analysis phase: NA31 for the study of CP violation and rare decays in K neutral's, UA2' for pantip collisions. Since the first e+e- collisions in August 1989, LEP experiments, Aleph and Delphi, have produced a huge amount of results on Z neutral physics and searches for new phenomena. After several years of design, construction and installation, the H1 detector is now waiting for the first ep collisions at HERA. Feasibility experiments as NEMO and Themistocle have reached a first step in proving the possibility of observing double beta decays for the former, point sources of cosmic gammas of very high energy for the latter. Two astrophysics experiments are at preliminary or design levels: the Naines Brunes (Brown Dwarfs) searches for compact massive objects contributing to Dark Matter while the very challenging experiment Virgo aims at the first evidence for gravitational waves. Future experiments, in particular at LHC, are being prepared by R and D in detectors