FP420 Hybrid Mechanical Design Ray Thompson / Manchester Manchester Xmas O7 Ray Thompson Julian Freestone, Andy Elvin

Detector pockets Beam pipes Beam line Cryo interfaces Detector Station Note Dimensions in mm

Precision Assembly of Detector Station Alignment of 3D silicon chips on a Hybrid  Blade Alignment of Blades to form a station Thermal issues Test Beam Improvements Next Things A few Illustrations ……….. Detector Positions required ~ 10 microns

Silicon Station Design Concept 5 Super planes per station 3D silicon Chips

 X Y  X Y 1 Align Chip using xy  stages 2 Move to Transfer chuck 4 Place glue pattern on both sides of blade in turn plate jig with robot 3 repeat for 2 nd chip 5Reunite Chucks and Jig 6Cure overnight 7Glue Flexes either side 8Cure 9Bond Chip 1 - support under chip bond pads Vac chuck Blade 1 – Non Overlappng Blade 2 Summary Steps Blade Assembly Issues - Adapt Atlas SCT Techniques

Thermal studies  Applied Heat Loads !w 2 detector blades 0.5w prox electronics 0.5 w for parasitics Silicon resistors To simulate detector heat load ( Fabricated by Chris Kenney) Thermal Simulation Berend Winter MSSL

Test Beam Oct 07 Electronics test 2 individual blades Chips not precision mounted Large readout card necessitated top mounting No cooling

Design Improvements : Super plane with decoupled precision front end Mcc card Unit held in (unseen) Transport Frame until Installed in station Flex Planar Geometry Better control of thickness Bearings Decouple front end to reduce forces from Mcc card + Cables Spring force Kinematic Bearings 3mm balls Side Bearings allow individual plane removal Sequential stack build up allows full survey

Super plane Stack with Bearing Rails

Bearing stability tests Fiducials C B A A Fixed Replaced Optically measure fiducials on detector and base Move detector blade and replace against dowel rods Difference of fixed Fiducials AB gives Resolution = 0.6 Micron Difference of Fixed And Detector gives Reproducibility Replaceable to Micron Accuracy Lx 1.47 Sigma Rx1.50 microns Ly0.82 Ry1.12 Repeat Right and Left, X and Y

Next Things Have to start defining Interfaces - alignment Kinematic bearings connect station to box Box outside to wire etc -- Alignment working group Jo Pater - output cables - Vac feedthroughs - Lid - Cooling Interfaces what and where - Have been concentrating on Blade and station precision assembly issue Know how to align chips on blade Know how to align super planes to form station Now - start focusing on proto jig designs - use these to construct test blades using silicon resistors to refine technique - So ready when silicon available for test beam - May/June ??? Now need to focus more on integration issues Vacuum box under construction Start assembling Box model

Detector Station Bearing Rail Block Conceptual cooling Block Defines accurate Z positions