Feasibility study of a vertical slit for the LBS line of the Linac4

The feasibility study of a vertical Slit was performed. This Slit is needed for the diagnostic Line for Beam energy Spread of the Linac 4 (LBS line). The Linac 4 will replace the Linac 2 and enable the Large Hadron Collider (LHC) to reach an energy of 14 TeV (highest energy ever reached). When the beam impact on it, the Slit heats up and deforms. The deformation of the slit is the key problem. The present feasibility study aims at assessing whether or not it is feasible to keep this deformation below 50_m, according to the specifications [14]. The determination of all the issues related with the Slit was driven. The priority was given to the thermo-mechanical issues. The methodology chosen to approach the problem led to three steps: - First, the determination of possible designs for the Slit. One design was identified. - Second, the determination of the best materials. Two figures of merit and a model were specifically conceived for it. Graphite R4550 was identified as the best material. - Third, the Monte-Carlo FLUKA code and the numerical simulation software ANSYS were used to evaluate the deformation, temperature and stress state of the Slit. The thesis concludes by stating that such a Slit is feasible and proposes a design.