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CMS Pixel CO 2 Cooling - Detector Cooling Operation-

CMS Pixel CO 2 Cooling - Detector Cooling Operation-. Summary. CMS Pixel detector upgrade Detector cooling loop layout Experimental Setup Experimental results vs Calculator Main lines flow distribution Pixel loops P&T behavior CO 2 Flow pattern map & HTC. Present CMS Pixel Detector.

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CMS Pixel CO 2 Cooling - Detector Cooling Operation-

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  1. CMS Pixel CO2 Cooling- Detector Cooling Operation- João Noite PH-CMX-DS

  2. Summary • CMS Pixel detector upgrade • Detector cooling loop layout • Experimental Setup • Experimental results vs Calculator • Main lines flow distribution • Pixel loops P&T behavior • CO2 Flow pattern map & HTC João Noite PH-CMX-DS

  3. Present CMS Pixel Detector BPix FPix • 66M silicon pixels • 3 Barrel layers (BPix) • 2 Forward disks (FPix) • Single phase cooling system C6F14 • Maximum heat load ≈5kW Port Cards BPix João Noite PH-CMX-DS

  4. CMS Pixel Detector Upgrade • 125M silicon pixels • 4 Barrel layers (BPix) • 3 Forward disks (FPix) • 2-Phase CO2 cooling system • Maximum heat load ≈9kW • To be installed in 2015-2016 BPix Supply Tube BPix Detector FPix Supply Tube FPix Detector DCDC Converters & Port Cards João Noite PH-CMX-DS

  5. Pixel detector numbers Highest powered loops: BPix -> 289W @ -Z Layer #1 FPix -> 238W @ all HD’s Longest Loops: BPix -> 12.8m @ -Z Layer #3 FPix -> 11.4m @ HD1 Total Maximum Power: BPix -> 5.36kW FPix -> 2.85kW Total Pixel Power = 8.21kW Legend: OHL – Irradiated detector at high luminosity NHL – New detector at high luminosity OS – Irradiated detector in standby NS – New detector in standby NP – No power João Noite PH-CMX-DS

  6. BPix & FPix Detector loop example João Noite PH-CMX-DS

  7. Experimental Setup João Noite PH-CMX-DS

  8. Experimental Setup DC-DC Converter Evaporator Detector Evaporator Supply / Return Tube João Noite PH-CMX-DS

  9. Experiment vs Calculator Detector Outlet Electronics Detector Inlet Detector M B Electronics Detector L I A A D D M I SLG SW S SLG SW S João Noite PH-CMX-DS

  10. Experiment vs Calculator Detector Outlet Electronics Detector Inlet Detector B Electronics Detector L I A A D D M M I SLG SW S SLG SW S João Noite PH-CMX-DS

  11. Flow distribution – BPix ML1 @ -20°C ΔPcapillary + ΔPdetector = 13.62 + 2.86 = 16.48bar ΔPcapillary + ΔPdetector = 11.78 + 2.8 = 14.58bar ΔPcapillary + ΔPdetector = 9.76 + 2.72 = 12.48bar • By looking at this plot one can see that the main line -Z ML1 needs at least 2x1.915=3.83g/s for cooling Layer #1 sectors, this total flow rate is set at the manifold’s metering valve. From slide 6 table one can see that this main line splits into two cooling loops L1D2MN and L1D1MF. • The worst case of operation is if one of these two loops has no power the flow will be higher on this one so instead of 1.91g/s it will increase to 2.03g/s. • The other parallel loop which is powered and thus will have higher resistance will get less flow 3.83-2.03=1.80g/s which is still enough to keep it away from the dry-out region. ΔPcapillary + ΔPdetector = 7.83 + 2.64 = 10.47bar Safe Operation: mnominal = 2.34 g/s Limit Operation: mnominal = 1.91 g/s 1.80g/s 2.03g/s 2.25g/s 2.43g/s OHL –> Q=289W, Irradiated detector at high luminosity NHL –> Q=208W, New detector at high luminosity OS –> Q=175W, Irradiated detector in standby NS –> Q=94W, New detector in standby NP –> Q=0W, No power João Noite PH-CMX-DS

  12. BPix –Z Layer #1 Tset = -20°C Q = 289W Tset = 15°C Q = 175W Return Return DCDC DCDC CCU Endflange Endflange DCDC DCDC CCU Endflange Endflange Capillary Capillary BPIX BPIX João Noite PH-CMX-DS

  13. BPix –Z Layer #1 Tset = -20°C Q = 289W Tset = 15°C Q = 175W B A D M B A D M I I SLG SW SW SLG S S João Noite PH-CMX-DS

  14. FPix +Z HD1 Tset = -20°C Q = 213W Tset = 15°C Q = 137W I-I PC O-O O-I I-O Return I-I Return PC O-O O-I I-O Supply Supply DCDC DCDC João Noite PH-CMX-DS

  15. FPix +Z HD1 Tset = -20°C Q = 213W Tset = 15°C Q = 137W B A D M B A D M I I SLG SW SW SLG S S João Noite PH-CMX-DS

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