ATLAS Thermosiphon Readiness Review 17th March 2016 Anders Andersen, Said Atieh, Renaud Barillere, Michele Battistin, Olga Beltramello, Stephane Berry, Alexandre Bitadze, Pierre Bonneau, Rusty Boyd, Claudio Bortolin, Banjamn Bradu, Johan Bremer, Ariella Cattai, Florian Corbaz, Olivier Crespo, Cyril De George, Beniamino Di Girolamo, Jose Direito, Fido Dittus, Martin Doubek, Gilles Favre, Didier Ferrere, Danilo Giugni, Jan Godlewski, Greg Hallewell, Andre Henriques, Sergei Katunin, Wieslaw Ivanski, Daniel Lefils, Didier Lombard, Sergey Malyukov, Steve McMahon, Dimitar Mladenov, Stefano Moccia, Rene Necca, Marzio Nessi, Sylvain Nichilo, Fernando Pedrosa, Elena Perez, Ludovico Pontecorvo, Dave Robinson, Cecilia Rossi, Vic Vacek, Lukasz Zwalinski

Why we are here Description of the system Description of the running modes Control of the system Commissioning main results Risk analysis Are we all sure enough we can safely run on detector? 17/3/2016 michele.battistin@cern.ch

The ATLAS ID Evaporative Cooling Situation in 2009-2010 Compressor reliability Vibrations – Leaks (slightly activated fluid) Increase of dust (compressor wear) 7 Haug compressors condenser liquid tank mixed water Sub-cooler pneumatic valve pneumatic valve others manual valve 4 liquid lines PR thermal screen UX15 USA15 dummy load pixel manual valve 6 X SCT 4 gas lines BPR manual valve 17/3/2016 michele.battistin@cern.ch

Why a Thermosiphon Solution condenser liquid tank Heater pneumatic valve Low temperature Chiller USA15 Surface From compressors To Improvements No active elements Reduction of leaks (activated coolant) No reason to “open” the circuit Recover design ID cooling T (-25°C) (ID-HEX) Possible decrease T (-30°C) with blends C3F8-C2F6 pneumatic valve others manual valve 4 liquid lines PR thermal screen UX15 USA15 dummy load pixel manual valve 6 X SCT 4 gas lines BPR manual valve 17/3/2016 michele.battistin@cern.ch

The evaporative thermodynamic cycle HEX subcooling liquid line to detector condensation HEX recuperation Capillary pressure drop compression heater evaporation gas line from detector 17/3/2016 michele.battistin@cern.ch

A new thermodynamic cycle HEX subcooling liquid line to detector By-pass heating HEX recuperation Capillary pressure drop heater evaporation Liquid column gas line from detector Condensation 17/3/2016 michele.battistin@cern.ch

Did we have any alternative? In 2009 ATLAS Cooling Group (J. Godlewski, D. Giugni, M. Battistin) has launched an extended research of alternative solutions to HAUG Compressors: Oil Free Screw Labyrinth Piston Membrane Centrifugal Turbo Labyrinth Screw Membrane Oil remained a large obstacle -> capillaries in activated region -> clogging 17/3/2016 michele.battistin@cern.ch

Thermosiphon Overall Schematics Thermosyphon Circuit Chiller Circuit Low Temperature Stage High Temperature Stage C3F8 R23 R404a Primary Water TS Condenser -60°C Water Circuit Brine Circuit C6F14 -70°C -30°C +27°C +25°C -60°C liquid -15°C gas -25°C -15°C By-pass Full power dummy load +20°C gas +20°C liquid 60 kW @ -25°C 1.2 kg/s Short review of main components -> 17/3/2016 michele.battistin@cern.ch

…let’s see pictures of different components Lay-out in ATLAS Water circuit Low T chiller Brine circuit Condenser C3F8 piping “Balcony” by-pass unit Evaporative connection ATLAS Surface PX15 USA15 UX15 …let’s see pictures of different components 17/3/2016 michele.battistin@cern.ch

Water skid location in SH1 Water Circuit Water circuit skid Primary water heat exchanger Water skid location in SH1 17/3/2016 michele.battistin@cern.ch

-70 °C - 180 kW two stage chiller 17/3/2016 michele.battistin@cern.ch

Brine pumps and piping 17/3/2016 michele.battistin@cern.ch

Condenser on SH1 roof 17/3/2016 michele.battistin@cern.ch

“balcony unit” – by-pass 17/3/2016 michele.battistin@cern.ch

Connection to the evaporative Liquid connection Gas connection 17/3/2016 michele.battistin@cern.ch

Sonar System (G. Hallewell) 17/3/2016 michele.battistin@cern.ch

Can we run on ID detector? Electrical lay-out Control architecture Commissioning results TS – Evaporative swap On detector cooling test procedure Risk analysis Q&A I take this opportunity to thanks all the TS team !!! 17/3/2016 michele.battistin@cern.ch