1. 13 May 2011 Eddy Jans 0 Plans for the VELOpix-module LHCb-Nikhef discussion some specifications some requirements some ideas about the VELOpix-module some ideas about how to cool the module concept plans at Nikhef

2. Strawman design: L-shaped module 2 tiles (13*42 mm 2 ) of 3 VELOpix chips on either side highly non-uniform irradiation and hit pattern non-uniform heat production: rough estimate: 1.5 W constant term 1.0  2.5 W radial dependent 13 May 2011 Eddy Jans 1 LHCb-Nikhef discussion VELOpix module specifications Tiles on the top side in yellow, those on bottom side in green 12 3 45 6 78 910 1112

3. 13 May 2011 Eddy Jans 2 LHCb-Nikhef discussion VELOpix module requirements Generic: chip/sensor/power/readout/connectors/data rate/etc. vacuum restrictions (outgassing) material budget mechanical stability, flatness and resistance against thermal cycling (glue, CTE-matching of materials) Cooling related: low material budget use liquid CO 2 as coolant remove ≤4 W/chip and keep module below -10 /-15 o C reliable and easily to handle/bend cooling tubes reliable CO 2 connections

4. 13 May 2011 Eddy Jans 3 LHCb-Nikhef discussion VELOpix-module ideas Substrate of CVD-diamond or TPG Ongoing attempts to apply direct metallization of the diamond

5. 13 May 2011 Eddy Jans 4 LHCb-Nikhef discussion VELOpix-module cooling ideas - Enclose 2 diamond pieces by a CF frame, - Cooling pipe around the edge - One TPG core large hybrid Bus cable Hybrids Coolant tube structure Carbon honeycomb or foam Carbon fiber facing Readout IC’s Silicon sensors Investigate different i.types of cooling pipe (Phynox, invar, s.s., …) i.ways of routing, ii.ways of attachment (surface of contact) ATLAS approach: use RVC foam to couple a metallic tube to the rest of the structure.

6. 13 May 2011 Eddy Jans 5 LHCb-Nikhef discussion Our VELOpix-module plans Design, test and qualify an interface of the cooling system with the VELOpix-module. Use the Green Cooler at Nikhef for lab tests. Required technical manpower: design (ANSYS calculations, experience, ideas, drawings):1.0 my construction (tubing, glue, heaters, assembly): 0.7 my electronics (cabling, temperature sensors, heaters): 0.5 my Green cooler operational support (PVSS, lab measurements):0.5 my First see how far we get with this and then, possibly, extend our ambitions towards a module0 design. Physicists involved: Els & Eddy