1. 7 February 2012 Annekathrin Frankenberger (HEPHY Vienna) Open CO 2 Cooling System at the beam test Belle II SVD-PXD Meeting

2. Open CO 2 Cooling System at the beam test Schematic view 1 Liquid CO2 from bottle 20°C @ 57bar 2 Evaporation temperature -20°C @ 20 bar 2 1 2 57bar @ 20°C 07.02.2012Annekathrin Frankenberger (HEPHY Vienna)

3. Open CO 2 Cooling System at the beam test p/h – Diagram CO 2 3Annekathrin Frankenberger (HEPHY Vienna) subcooling cooling heating Saturation line Saturation line fluid Saturation line gaseous Isothermal -20°C 07.02.2012

4. Open CO 2 Cooling System at the beam test Design Requirements Evaporation temperature of the CO 2 for cooling: ~ -20°C  necessary pressure 20bar Mass flow 1-10g/s for cooling up to 1000W Compact and transportable system Electronically controlled (temperature, pressure, mass flow, valve) Material of components (tubes, valves, heat exchanger) Stainless steel AISI 316L Easy and resealable tube coupling: Swagelok ferrule tube fittings Good insulation: Armacell 4Annekathrin Frankenberger (HEPHY Vienna)07.02.2012

5. Open CO 2 Cooling System at the beam test First tests New metering valve to achieve a lower mass flow old valve: - flow coefficient c v =0.04 new valve:- flow coefficient c v =0.004 pressure regulator replaced by a capillary tube 1.6 x 0.5mm Smaller evaporation tube  closer to SVD tube dimension 5Annekathrin Frankenberger (HEPHY Vienna) 3 x 2mm1.6 x 1mm 1.6 x 1.2mm 1.6 x 1.5mm 6 x 4mm Evaporation tubes Tested SVD Cooling box 07.02.2012

6. Open CO 2 Cooling System at the beam test Beam test @ CERN October 2011 Portable cooling box  convenient transport and setup Tested 3 Origamis with cooling  total heat load 10.5W Goals  -20 °C at tube surface  Stable conditions (temperatures) for reasonable data acquisition Annekathrin Frankenberger (HEPHY Vienna)607.02.2012

7. Open CO 2 Cooling System at the beam test Beam test – Setup Annekathrin Frankenberger(HEPHY Vienna)7 CO 2 Supply 12 x 37,5kg = 450kg Gas cylinder battery 3 Origami modules in test box Cooling box with operating workstation 7m 07.02.2012

8. Open CO 2 Cooling System at the beam test Fixed cooling tube 8Annekathrin Frankenberger (HEPHY Vienna) Beam test – Setup evaporation tube Stainless steel tube 1.6 x 1.0mm Cooling tube fixed in sidewall 07.02.2012

9. Open CO 2 Cooling System at the beam test 9Annekathrin Frankenberger (HEPHY Vienna) Beam test – Setup evaporation tube inlet outlet Capillary tube x/y-table mounting 07.02.2012

10. Open CO 2 Cooling System at the beam test 10Annekathrin Frankenberger (HEPHY Vienna) Beam test – Temperature measurement Temperature sensors fixed outside on tube wall No insulation of sensor  Measured temperature not the CO 2 temperature inside of the tube Temperature sensor 07.02.2012

11. Open CO 2 Cooling System at the beam test 11Annekathrin Frankenberger (HEPHY Vienna) Beam test – first long term run 3 days tests with Origamis Stable measurements for the whole run Temperature difference because of pressure drop in evaporation tube 24h 4h Pressure reduction for lower temperature 07.02.2012

12. Open CO 2 Cooling System at the beam test 12Annekathrin Frankenberger (HEPHY Vienna) Beam test – measured temperature Mass flow 0.9g/s Evaporation pressure 19bar Evaporation temperature of CO 2 @19bar : -21.2°C  Temperature on evaporation tube -16°C Mass flow 0.9g/s Evaporation pressure 16bar Evaporation temperature of CO 2 @ 16 bar: -26.6 °C  temperature on evaporation tube -22°C 07.02.2012

13. Open CO 2 Cooling System at the beam test 13Annekathrin Frankenberger (HEPHY Vienna) Beam test – conclusion / results Transportable system  setup at CERN quite uncomplicated Stable measurements over long time Pressure drop at evaporation tube (~2bar)  bigger inner diameter  already arrived and tested in Vienna (0.2mm bigger ID)  no temperature difference at new evaporator (means no pressure drop) 07.02.2012

14. Open CO 2 Cooling System at the beam test 14Annekathrin Frankenberger (HEPHY Vienna) Outlook towards Belle II SVD Current state: Stable and adjustable system for further development Dimensioning, routing and insulation of supply lines Design of manifolds Cooling test with end rings Thermodynamic / heat transfer investigations Check theoretically calculated results (length of capillary tubes, valve dimensioning) Cooling tubes inside the detector (APV heat contact, dimensions, connection, bending) 07.02.2012

15. Open CO 2 Cooling System at the beam test 15Annekathrin Frankenberger (HEPHY Vienna) Thank you! 07.02.2012