Abstract
Thermal cooling performances of extremely lightweight mechanical carbon fiber support structures with an integrated liquid cooling system for monolithic silicon pixel detectors have been investigated. The high heat removal efficiency using single-phase liquid flow is shown for a power density up to 0.5 W/cm2. These solutions provide therefore possibility to build a detector with a record radiation length of 0.3% per layer, ensuring considerable extensions of the physical program of investigations of the quark-gluon plasma in ultra-relativistic heavy-ion collisions at the Large Hadron Collider.
Highlights
Test samplesIn the design of the ALICE ITS upgrade [1, 2] the very central part or Inner Barrel is assumed to be composed of three layers of 50 μm thick CMOS pixel detectors that will surround the interaction point
- Development of diamond powder filled carbon fibre pipes K.W
These solutions provide possibility to build a detector with a record radiation length of 0.3% per layer, ensuring considerable extensions of the physical program of investigations of the quark-gluon plasma in ultra-relativistic heavy-ion collisions at the Large
Summary
In the design of the ALICE ITS upgrade [1, 2] the very central part or Inner Barrel is assumed to be composed of three layers of 50 μm thick CMOS pixel detectors that will surround the interaction point. The HIC will be glued to the ultra-lightweight carbon fiber support structures of 290 mm length with embedded cooling pipes (figure 1). These structures provide the functionality of the CMOS detectors in terms of operational temperature and mechanical position stability. The Cold Plate is made of a high thermal conductive Carbon Fiber Reinforced Plastics (CFRP) in combination with different additional layers (see figure 2), with embedded cooling polyimide tubes providing the liquid coolant (water) circulation. The carbon fiber support Space Frame comprises a wound truss carbon fiber structure with a triangular cross section (obtained by winding a carbon rowing at an angle of 45◦ with respect to the Cold Plate longitudinal axis) It provides the mechanical stability of the whole linear module. Dimensions of the cooling pipes and their geometry** round polyimide tubes, diameter 1.45 mm; Weight (g)
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