Proximity Cryogenics P&IDs Meeting Michel CHALIFOUR (on behalf of the CERN Neutrino Cryogenic Group and David Montanari) Neutrino Platform General Bi-weekly Meeting March 3, 2016 Proto Dune-DP-NP02

Process and Instrument Diagram Operation modes Outline Project Requirements Process and Instrument Diagram Operation modes 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

Engineering parameters (from Detector Requirements) Mode Parameter Value Notes 1 GAr purge flow rate 88 m3/hr From 1.2 m/hr 2 Maximum cool-down rate TPC 40 K/hr 10 K/m Maximum Delta T between any two points in the detector 50 K 3 LAr filling flow rate (*) 18 l/min Assuming 2 trucks/day (**) 4 Cryostat static heat leak 3.0 kW GAr boil-off (18 g/s) Other heat loads (estimate) 5.0 kW Total estimate is ~ 8 kW LAr circulation (5 days turnover) 72 l/min (19 gpm) Nominal value (1 pump) 5 Emptying (w both LAr pumps) 144 l/min (38 gpm) Limited by size of tank/truck * Value might be limited by the pressure inside the LAr storage dewar. ** We need to contact the supplier to confirm availability of 2 trucks/day of LAr. Note: Noise, micro phonics and vibrations inside the LAr volume will be studied with an external pump configuration. 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

Cryogenic systems Internal Cryogenics (not part of Neutrino Cryogenic group scope): Inside the cryostat. GAr/LAr distribution for cryostat purge, cool down, fill. Interface control document needs to be created in-between proximity and internal cryogenics for physical and functional parameters (eg: temperature sensors/quantity and location for operation, Larg and Garg mass flow rate to cool down, interlock on Temperature, etc...) Proximity Cryogenics: Circulate and purify LAr. Achieve and maintain LAr purity. Recondense and purify boil off GAr. Infrastructure/External Cryogenics: Receive Ar/N2. Transport GAr/LAr, GN2/LN2 to Proximity. Vents. Technical Specification/Tender will cover these 2 parts only 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

Modes of operation Piston Purge Cool down Filling Normal operations Before starting piston purge, a purging and flushing of all argon circuits is mandatory GAr is slowly flown from the bottom of the tank to push the impurities out from the top. Cool down A mix of GAr and LAr is flown into sprayers to generate a mist of small liquid droplets that are moved around by another set of sprayers flowing GAr only. Filling Once the cryostat and TPC are cold, LAr is introduced in the cryostat. Normal operations LAr is continuously purified by means of an external LAr pump (2 are installed for redundancy, but only one is in use). Boil-off GAr is recondensed outside of the cryostat and purified before being reintroduced as LAr. Emptying At the end of the operations (or if/when maintenance on the tank is needed), the tank is emptied and the LAr removed. 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

Storages tanks & Regeneration system / External Cryogenics LArg storage tank LN2 storage tank Regeneration system 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

Filtering system / Proximity Cryogenics Purity monitor LArg filters GArg filter 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

Cryostat / Distribution system / Proximity & Internal Cryogenics LN2 Phases Separator Condenser LArg circulating Pump-Optional? LArg circulating pumps LArg Phases Separator Needed? 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

Operation Modes 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

Operation Mode PURGE IN OPEN LOOP 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

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Operation Mode PURGE IN CLOSED LOOP 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

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Operation Mode COOL DOWN 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

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Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02 If needed 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

Operation Mode FILLING 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

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Operation Mode NORMAL OPERATION 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

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Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02 If needed 03.3.16 Michel CHALIFOUR P&IDs Meeting Proto Dune-DP-NP02

Operation Mode EMPTYING 03.3.16 Michel CHALIFOUR P&IDs Review Proto Dune-NP02

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Operation Mode FILTER REGENERATION 03.3.16 Michel CHALIFOUR P&IDs Review Proto Dune-NP02

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03.3.16 Michel CHALIFOUR P&IDs Review Proto Dune-NP02