1. A.P.Colijn1 CO2 @ Nikhef CO2 @ Nikhef – History CO 2 @ Nikhef - Who is Who CO 2 @ Nikhef - Work in Progress CO 2 @ Nikhef - Plans

2. CO2 @ Nikhef - History CO2 cooling new? Nikhef has over 10 years experience with CO 2 cooling: AMS & LHCb (see talk Bart) A.P.Colijn2 15kW CO 2 compressor in 1897

3. CO2 @ Nikhef – Who is Who? CO2 cooling project: –Bart Verlaat – engineer, –Krista de Roo – physicist –Berend Munneke – engineer –Gertjan Mul – engineer –Luc Jansen – electronic engineer –Piet de Groen - electronic engineer –Martijn van Overbeek – instrumentation –Erno Roeland – instrumentation –Auke-Pieter Colijn – physicist Stave & Petal projects: –Henk Schuilenburg, –Marco Kraan –Eric Hennes –Gerrit Brouwer –Hans Band, –Els Koffeman, –Nigel Hessey A.P.Colijn3 Expertise : CO2 plant engineering Construction Welding (also Orbital) Vacuum technology Slow control - PVSS

4. CO2 @ Nikhef – Work at Nikhef Warm cooler – 1kW @ 20C Cold cooler – 1kW @ -40C Micro cooler – 20W@-20C a.k.a. “The Espresso Machine” LHCb vacuum accident simulator Test Facility for: –IBL like cooling tube –Isolation at 0 bar: Is-0-bar –CF tubes –Stave structures –R&D projects A.P.Colijn4

5. 02-02-2009 The 2-Phase Accumulator Controlled Loop (2PACL) 2PACL principle ideal for detector cooling: -Liquid overflow => no mass flow control -Low vapor quality => good heat transfer -No local evaporator control, evaporator is passive in detector -Very stable evaporator temperature control with 2-phase accumulator (P 4-5 = P 7 ) Liquid Vapor 2-phase Enthalpy Pressure 1 23 4 5 6 P7P7 Condenser Pump Heat exchanger evaporator Restrictor 2-Phase Accumulator Heat in Heat out 1 23 4 5 6 P7P7 P 4-5 Long distance

6. Warm Cooler – 1kW @ +20C A.P.Colijn6 warm cooler Enthalpy [J/g] Pressure[bar] Condenser PLC Pump unit Accumulator Aim: 1.Study gear-pump behaviour 2.Cooling for R&D projects

7. Warm Cooler – Gather Pump first results Day 1: –Pumps work and flow is established through plant: condenser uses ‘tap-water’ at 18C –Each pump can build up 4 bar –In series 7 bar is achieved Two weeks later: –No flow, but condenser uses cooling water of 6C –Internal parts of pumps not compatible with CO2: pump gears are ‘jammed’ due to swelling of peek CO2 compatible pump-parts under investigation with Gather A.P.Colijn7

8. Warm Cooler – What will you see? The two Gather pumps removed from the cooling plant Replaced by the spare LHCb pump. And then…. A.P.Colijn8

9. 02-02-2009 Cold Cooler 1kW@-40C Julabo cryostat Accumulator Condenser Pumps PLC Primary cooler cold cooler warm cooler Enthalpy [J/g] Pressure[bar] Aim: 1.Prototype for …….. 2.Facility for CO 2 R&D.

10. Micro Cooler 20W @ -20C A.P.Colijn10 Condenser Pump Heat exchanger evaporator Restrictor 2-Phase Accumulator Heat in Heat out 3 4 5 Control accu temperature with Peltier elements: cool+heat! Condenser uses Peltier: dT of 40C @ 20Watt “Coffee-machine” pump AMS 1liter accu with Peltier

11. LHCb vacuum accident simulator (Krista de Roo) A.P.Colijn11 Vacuum vessel “Supply line” Vacuum pump Simulink model

12. CO2 Test Facility: IBL cooling tube h “Realistic” IBL dimension stainless cooling tube. HTC Ingenious pressure measurement –Erno Roeland & Martijn van Overbeek A.P.Colijn12 70W 120W 0.8g/sec 1.2g/sec0.0g/sec T1T2T3T4T5

13. CO2 Test Facility: Is0bar (Berend Munneke) Isolate cold supply line with vacuum. Vacuum known isolator. Inner line allowed “point” contact with outer wall –Easy to construct –Small envelope compared to normal isolation –Q: What are the effects of point contacts? –Q: What vacuum quality do we need? A.P.Colijn13

14. CO2 Test Facility: Other applications GridPix R&D Stave design for ATLAS upgrade XFEL detectors Anything that needs to be cool! A.P.Colijn14

15. CO2 @ Nikhef – Future ? Construct mobile / exportable CO2 plant. If all goes well: ready spring 2010 Design IBL cooling pipework inside ATLAS Construct a O(2kW) plant for IBL A.P.Colijn15

16. Mantra CO 2 is good for cooling CO 2 is good for ATLAS CO 2 is good for environment CO 2 is good for everybody A.P.Colijn16