A.P.Colijn1 Nikhef Nikhef – History CO Nikhef - Who is Who CO Nikhef - Work in Progress CO Nikhef - Plans

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

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

Nikhef – Work at Nikhef Warm cooler – 20C Cold cooler – -40C Micro cooler – 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

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 P7P7 Condenser Pump Heat exchanger evaporator Restrictor 2-Phase Accumulator Heat in Heat out P7P7 P 4-5 Long distance

Warm Cooler – +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

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

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

Cold Cooler 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.

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

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

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

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

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

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

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