Silicon Tracker Module Assembly at UCSB

This note details the infrastructure deployed and developed at the University of California at Santa Barbara (UCSB) to handle the construction of CMS Silicon Tracker modules for the outer barrel and endcap. Capacity has been developed to assemble and wirebond 15 modules per day and in addition to wirebond 30 hybrids. Early results and experiences of production are also given. In the £rst substantial module build, 5.3% of 150 modules were slightly outside of the mechanical speci£cations. Based on the data obtained during that build, it was possible to introduce correction factors which resulted in the 58 subsequent modules constructed being all within speci£cations. For module bonding a very low introduced failure rate of only 0.005% is observed. A higher corresponding rate for hybrid bonding of 0.022%, is attributable to one particular batch of problematic hybrids.