ray thompson manchester xmas meeting 20/21 dec 06 ray thompson, julian freeston, andy elvin wp4...
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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
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30 layer Test beam Prototype
10k channelsConections to Silicon via Conducting Glue blobs
silicon - 1 cm2 pixels
Silicon tungsten layers
Marc Anduze, LAL
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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 BarrelDetector mounting Brackets glued to Carbon Fibre cylinder
-CMS Tracker modules - Conducting Glue Bias connection to backplane Tony Affolder,UCSB
Change in Sensor Bias Resistance (144 sensors)From May to July 2005
0
10
20
30
40
50
60
70
80
90
-250
-150
-50
-30
-10
-8 -6 -4 -2 0 2 4 6 8 10
30
50
150
250
ohms
Frequency
Increasing glue resistance 1 month
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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
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Resistance measurementsKeithley 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
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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
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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 ?
InterchangeableVacuum pickup tool