Speakers
Description
The focus of this work is the current CMS capillary production state in view of the upcoming upgrade. Capillaries play a key role in a cooling loop by ensuring proper flow distribution among parallel branches. For this purpose, it is important that they are sized such that a given flow rate through each capillary produces the desired pressure drop.
Due to their small dimensions large quantities, the production process is extremely time-consuming and requires careful handling, as well as coordination among different working groups - from the data purchase to connector brazing and connection quality control.
In this poster, we present the current production status and recent tests carried out to investigate the impact of capillary shape changes after production. The results obtained led us to prototype and test capillaries in their installation configuration. Finally, close collaboration with the CERN brazing team guided the selection of Stainless Steel 316L as the appropriate material for capillary vacuum brazing.