1. 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

2. 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)

3. St. Steiner Uni. ZH

4. 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

5. 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

6. 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