1. Nikhef Amsterdam Mechanical- Technology Short update on CO 2 cooling activities at Nikhef 13 October 2010

2. Nikhef Amsterdam Mechanical- Technology Green Cooler CO 2 Components ◦ Accumulator ◦ Mass flow meter ◦ Relief valves ◦ Valve extensions XFEL Cooler Prospect Contents 2

3. Nikhef Amsterdam Mechanical- Technology Green Cooler specifications Cooling capacity: 1.5 kW Operating temperature: -40 °C 3

4. Nikhef Amsterdam Mechanical- Technology Green Cooler cooling cycle 20 Settings: Temperature: -10 °C Enthalpy control: 175 J/g Enthalpy control heater 4 150 200 30 40 H (J/g) P (bar) -10 °C -20 °C 0 °C Experiment

5. Nikhef Amsterdam Mechanical- Technology Green Cooler – VELO replacement Cooling tests Parallel cooling capillaries 5

6. Nikhef Amsterdam Mechanical- Technology Components - Accumulator Accumulator for CMS Volume 27.2 liter and maximum pressure 110 bar → PED class III Much delay caused by PED certification A company that is too excellent (Lloyds) 6

7. Nikhef Amsterdam Mechanical- Technology Components - Mass flow meter Mass flow meter RHM015 Resonance between 1750 and 2250 rpm Mechanical vibrations Mass flow meter test New mass flow meter RHM03 7 Experiment

8. Nikhef Amsterdam Mechanical- Technology Components – Relief valves Swagelok relief valves Parker CE certified relief valves EPR 90 seal 8

9. Nikhef Amsterdam Mechanical- Technology Components - Valve extensions Designed at Nikhef to extend standard Swagelok ball valves Operate on a panel Better insulation 9

10. Nikhef Amsterdam Mechanical- Technology European XFEL X-ray Free Electron Laser detector development at Desy A cooler with a cooling capacity of 1.2 kW at an operating temperature of -15 °C 10

11. Nikhef Amsterdam Mechanical- Technology XFEL Cooler - Primary cooling Commercial condensing unit Operating temperature -25 °C Components Hot gas by-pass 11 R404 cooling plant

12. Nikhef Amsterdam Mechanical- Technology Prospects Running the Green Cooler at -30 °C Deliver a certified accumulator at CMS Test mass flow meter Test Parker relief valves Building the XFEL Cooler For more information: http://www.nikhef.nl/pub/departments/mt/projects/CO2cooling/Projects/ http://www.nikhef.nl/pub/experiments/atlaswiki/index.php/XFELCooler 12