Désign Guidelines for the Compact Muon Solenoid Inner Tracker Upgrade

The Compact Muon Solenoid, as well as other experiments within the Large Hadron Collider at CERN, will undergo a vast redesign during the decade of 2010. The main reasons behind this overhaul are to improve accuracy and longevity of the individual experiments. The physics experiments are poised to move beyond the current capabilities of the experiments. The energies involved in the particle collisions will outpace the operating capabilities of the current experiments without a major upgrade. The main objective of the work done within the scope of this thesis was to develop the design of the new sensor modules and their mechanical aspects. The thesis covers an introduction into the current Compact Muon Solenoid detector. The main content is the progress done with the module design of the next generation tracker modules. These new modules will be installed in next incarnation of the Compact Muon Solenoid. The development work depicted in this thesis was done between June 2012 and December 2013. The new sensor modules and their designs progressed from preliminary ideas into concrete design options during the writing of this thesis. 3D models were created with increasing accuracy and exercises on populating the required volume inside the CMS were made using the new module designs. One of the most significant advances was the simplification of thermal pathways for relaying excess heat out of the delicate components and into a cooling solution outside the volume. The inclusion of a new alloy of aluminium and carbon fibre played a significant role in the success of this aspect. Two separate types of modules were developed with differing approaches to and geometrical designs: 2S and PS –modules. Current inner tracker design within the CMS includes modules mounted parallel to the beamline. This leads to inefficient use of the module’s sensing surfaces. A great deal of design effort was put into designing alternative ways for incorporating the new modules in a more efficient way into the inner tracker volume. A significant reduction of the number of required modules is to be expected if the design proves feasible