Issues in the design of the LHC

The lectures aim is to give an overall view of the project rather than a detailed specialized analysis.The main issues are reviewed in the first lecture. After a brief overall description of the machine as foreseen at the present stage of the dessign,the various problems that the design team has to face and the proposed solutions are detailed.The beam dynamics and beam optics problems are briefly discussed. The superconducting magnet technology is presented together with the first models and prototypes results. Some indications are given on the possible strategy for their manufacture.The required performance of the cryogenics system is given,the utilization of the LEP cryogenics plant in the LHC cryogenics system is explained. The implantation of the LHC equipment in underground caverns and in surface buildings is reviewed. Finally some indications are given on the running in of LHC.