CMS Pixels upgrade CO 2 cooling transfer lines Introduction to the two projects P.Tropea 5 Dec 2012

The Pixel Upgrade One new detector, two sub-systems: Bpix and Fpix, the innermost layer of silicon detector around the LHC P5 interaction point 15 kW total power to be dissipated by the electronics Operating temperature down to -25 (on detector), -40 for the coolant Detector sits inside strong magnetic field, radiation environment, no active components for cooling in the proximity 5 Dec 2012 P. Tropea & H. Postema, for the CMS CO2 team 2

The CO2 cooling system Two identical “plants” sitting far away from the detector, in the service cavern (USC) Two “manifolds”, sitting along the wall of the experimental cavern (UXC) Dedicated transfer lines: a)Plant to manifold b)Manifold to detector 5 Dec 2012 P. Tropea & H. Postema, for the CMS CO2 team 3 CO2 plants 3 12 USC55UXC55 Manifolds

First plant & manifold prototype to be installed in TIF (bldg 186) in Jan 2013: prototype of “plant to manifold” transfer lines Detector transfer lines must be installed ½ in summer 2013, ½ in Autumn 2013 Transfer lines (plant to manifolds) to be ready in May 2014 Boundary conditions, common to all systems Operating pressure = 100 bar Design pressure = 110 bar (testing pressure =157 bar) Operating T = -35/+30 (insulation!) Evaporative system: profits of concentric lines! liquid (inlet line) pipe inside vapor (return line) pipe First plant & manifold prototype to be installed in TIF (bldg 186) in Jan 2013: prototype of “plant to manifold” transfer lines Detector transfer lines must be installed ½ in summer 2013, ½ in Autumn 2013 Transfer lines (plant to manifolds) to be ready in May 2014 Boundary conditions, common to all systems Operating pressure = 100 bar Design pressure = 110 bar (testing pressure =157 bar) Operating T = -35/+30 (insulation!) Evaporative system: profits of concentric lines! liquid (inlet line) pipe inside vapor (return line) pipe 5 Dec 2012 P. Tropea & H. Postema, for the CMS CO2 team 4 Liquid Vapor Insulation Transfer line projects

USC to UXC transfer lines 5 Dec 2012 P. Tropea & H. Postema, for the CMS CO2 team 5 -Z End +Z End TX 54 Manifolds 2 concentric pipes routing from USC to UXC (plant to manifold connection) Either 40 or 90 m overall length Inner pipe (liquid CO2) DI=10 mm Outer pipe (vapor CO2) DI= 27 mm Vacuum jacket =? Longer term project: testing section to be installed on surface Feb 2013, final system by May 2014 See Hans Postema slides for all details

YB0 transfer lines 5 Dec 2012 P. Tropea & H. Postema, for the CMS CO2 team 6 4 bundles of 4 concentric pipes each, total of 16 pipes with different shapes, routing along YB0 (CMS central wheel) Inner pipe (liquid CO2) DI=4 mm Outer pipe (vapor CO2) DI=10 mm Vacuum jacket =? Max reserved space 30 mm D Most urgent project: very short installation window in 2013 See Nicola Bacchetta slides