Speaker
Description
This report provides an overview of the busbar and cold mass activities, with a focus on the work related to the Line N system. It begins with a general introduction to the layout of the busbars and cold masses, followed by a summary of the preparatory steps for Line N, its insertion process, and the key lessons learned.
A proposed modification to the busbar layout is then presented, aimed at enabling the operation of the IT string despite the presence of leaks in N line flexibles. This proposal considers both mechanical integration constraints and cable availability. The thermo-mechanical behavior of the busbar system is discussed in detail, with emphasis on the impact of thermal contraction under the current configuration. An ongoing study attempting to characterize the cable through mechanical measurements is also described, along with its limitations. Potential technical mitigation measures are outlined.
Finally, the report introduces initial ideas for a possible upgrade of the busbar system for the High-Luminosity LHC tunnel installation, highlighting how the insights and lessons learned from the IT string motivate future developments.