Ray Thompson Manchester Xmas Meeting 20/21 Dec 06 Ray Thompson, Julian Freeston, Andy Elvin WP4 aims: look at Mechanical/Thermal/ Assembly issues Utilise Atlas SCT experience effort weighted to latter end of period conducting Glues Assembly concepts Calice WP4

30 layer Test beam Prototype 10k channels Conections to Silicon via Conducting Glue blobs silicon - 1 cm2 pixels Silicon tungsten layers Marc Anduze, LAL

Conducting Glue - wildly exciting. Ray Thompson Manchester Xmas Meeting 20/21 Dec 06 But you should see people panic when production faults start Are small no of faults the thin end of a long wedge? Silicon detectors expensive and irrecoverable Atlas Barrel Detector mounting Brackets glued to Carbon Fibre cylinder - CMS Tracker modules - Conducting Glue Bias connection to backplane Tony Affolder,UCSB Increasing glue resistance 1 month

Literature search Electronics industry experience Other Experiments - small no of tried glues Conducting Glues Silver filled 2 part epoxy ( no mass loss no voids) Ag has high conductivity, Silver oxide conducts realise conductivity ~1/1000 solid Ag -interconecting particles choose particle size, viscosity,,cure temp EPO-tek 4110 Areas of interest - resistance aging Interface problems oxide layer at Al/Ag interface Production wafers old CTE mismatch Si /PCB - glue flexible Glass transition temp CTE change 50 x10-6 to 150 x10-6 Corrosion/electro chemistry – Ok for N2 atmosphere Glue effects on wafer passivisation

Resistance measurements Keithley 2000 DVM or 236 SMU Labview Glue test set up Ray Thompson Manchester Xmas Meeting 20/21 Dec 06 Glue Robot 3x3 3mm square pixels Standard 6X6 10mm square pixels Prague wafers Programmable Environmental chamber

Ray Thompson Manchester Xmas Meeting 20/21 Dec 06 Pc board / gold Resistance snake Tests  R 0.1 ohm/50 dots pcb Silicon pads Thermal Cycling 20—70 deg 1 deg/min

This years deliverable - Glue problem Study - Written up Test set Up - Thermal Cycling Spring. Continuing with Prague samples Start Assembly concept studies Start thinking about on pick and place techniques for assembling detector planks Look at/ exploit existing stuff CMS/Atlas experience Generalised concept of a gantry with interchangable tools pattern recognition software Ray Thompson Manchester Xmas Meeting 20/21 Dec 06 Where now ? Interchangeable Vacuum pickup tool 