Abstract : The Large Hadron Collider started his operations of proton beams on September 10th 2008. In a realistic forecast it is supposed to demonstrate (or confute) the existence of the Higgs boson for the year 2014. After this date the physics of rare events will be explored more in details and an upgrade of the luminosity can make an important difference in the program of experiments at CERN.
This thesis proposes several ideas to increase the luminosity of ATLAS and CMS experiments, the main scientific experiments of LHC. Moreover an improvement of the TOTEM experiment's acceptance is presented.
The set of magnets in charge to provide the final beam focalization for the collisions is considered in order to improve the luminosity in the interaction regions. The new optical configuration are studied with the methods of beam optics and beam dynamics. These layouts are also explored from the point of view of incorporation in the existing experiments developing the analysis of energy deposition and misalignment tolerances.
A new optical layout for the TOTEM experiment, based on the use of silicon crystals, is presented in the framework of an upgrade of acceptance.
These studies were performed with the use of analytical methods for the general considerations and numerical methods for the parameters optimization.
The results are published in original papers presented in several international conferences and workshops of luminosity upgrades.