S&C meeting 02-01-2006

• The SSD survey data

• The data have been compiled in several tables wafers,ladders,sectors and barrel (/afs/rhic/star/users/lmartin/FromSurvey)
• The table format has to be improved/unified (taken from Spiros)
• The element positions are relative to their parent
• The wafer tables is deduced from the ladder assembly survey (a ladder = a plane)
• The ladder tables is partly deduced from the sector assembly survey
• I have check from my side that adding the wafer information from the survey does improve the residual plots :
  • ladder 17 (dx versus z) : 018 to 009
  • ladder 18 (dx versus z) : 018 to 009
• The global alignment can be still improved. Sector effects are not accounted for at the moment
• ladder 1 (before and after a sector rotation) : 018 to 010
• There is still a bug in the mechanical drawing used to compute "nominal" positions (here)
• There are some strange structures in the dx versus phi plots
• For instance for ladder 1
• Looking at all ladders one gets this plot
• Looking back at ladder 1 for every wafers (here)
• Looking at ladder 20 for every wafers (here)