Pixel Detector System (Barrel & Forward) Beam pipe bake out  insertion/removal of pixel detector Rail system for FPIX & BPIX & supply tubes AOH & DOH boards Area Barrel = 0.78 m2 Disk = 0.28 m2 Total ~ 1 m2  65M Pixel Supply tube: power, cooling & optical links

Barrel Mechanics PCB for PCB for Layer 3 Layer 1 & 2 Al -cooling tubes with C-fibre ladders cooling manifold cooling fluid - 10 oC Kapton signal cable to Supply tube PCB for 3 x 4 modules  power group Module signal cable plugs (ZIF, 21 traces) & LVDS driver chips 4 thin PCB’s (Dyconnex. 4 layer)

St. Steiner Uni. ZH

New Cooling Pipes So far: New solution: silicon rubber hoses medical quality 10Mrad sterilized Pmax= 1.7 atm (spec) New solution: 10mm silicon rubber hoses glas cloth fortified 12Mrad irrad. at PSI Pmax= 10 atm (spec) Aluminum clip by spark-erosion  fabrication

Modified Mechanics for CO2 Cooling Cooling pipes stainless steel. Diameter d = 1.50mm and wall thickness t = 50mm  pmax = 275 bar safety factor 3  pop = 90bar Layer 1 r=4.4cm Diamond filled Araldite Old New

Modified Mechanics for CO2 Cooling (2) Biphase CO2 cooling allows long cooling loops ( ~2-3m) with very small diameter pipes ( ~ 1mm ) for thermal loads of ~ 100 W Present C6F14 monophase has parallel cooling pipes with manifold and large crosssection silicon hoses for feed and drain in front of FPIX tracking region. New CO2 allows serialized pipes without pressure drop problems and therefore reduces resident cooling liquid by large factor. Density of liquid CO2 is ~ 1.03 g/cm3 compared to 1.76 g/cm3 of C6F14