Proximity Cryogenics P&IDs meeting Michel CHALIFOUR (on behalf of the CERN Neutrino Cryogenic Group and Mike Zuckerbrot) Neutrino Platform General Bi-weekly Meeting March 3, 2016 SBN-FD/NP01

Process and Instrument Diagram Operation modes Outline Project Requirements Process and Instrument Diagram Operation modes 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Physics Required Parameter Requirements for SBN-FD Cryostat/Cryogenic systems Physics Required Parameter Value LAr purity in cryostat >3 ms electron lifetime (<100 ppt O2 equivalent) Verifiable contamination levels for LAr delivery O2 < 1 ppm, H2O < 1 ppm, N2 < 2 ppm Max Design Over-Pressure 350 mbarg (~5 psig) Operating gas pressure 150 mbar (~2 psig) with +/- 5% (~0.1 psig) Vacuum tightness Localized leaks < 10-8 mbar x liters / s Global leak rate < 10-6 mbar x liters / s Minimum inner dimensions cryostat 3600 mm (Transv) x 19900 mm (Para) x 3900 mm (H) (-0 mm +10mm for all dimensions) Cool-down rate ≈ 2 K/hr (5 days to cool to LAr temperature) TPCs max gradients < 70 K < 50 K (vertically) LAr recirculation rate ≈2 m3/hr/T300 module (one volume / week) Purification Technique Pump down to vacuum and fill with purified LAr LAr flow speeds < 20 cm / sec Minimum depth of liquid argon 3783 mm (From the floor) Maximum static heat leak <10 W/m2 (Sides/Floor) 10 W/m2 (Roof) 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Cryogenic systems Internal Cryogenics (not part of Neutrino Cryogenic group scope): Internal piping. Temperature neasurement (detectors and cold vessel), level measurement, Safety devices (magnetic burst disc) 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 (not part of Neutrino Cryogenic group scope): Store LAr/LN2. Transport GAr/LAr, GN2/LN2 to Proximity. Vents, analysers. Interface control document needs to be created in-between proximity and external cryogenics for physical and functional parameters (eg:Larg and Garg mass flow rate to cool down and in operation, etc...) In general ICDs need to be created with all the interfaces. Technical Specification/Tender will cover this part only 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Modes of operation Pumping down / Purge Cool down Filling Vacuum pumps (turbo molecular pumps) are connected to the cold vessels and the argon circuit up to the Larg tank, around 2 months is needed of pumping to achieve 10-4mb, then pressurization of the cold vessels @1100mba with GAr (from liquid phase). Cool down The thermal screen is cool down with LN2 circulating pump forced flow, the cold vessels and the detectors are cool down in free convection flow. The pressurization of the cold vessels are regulated with the LArg Tank. In addition at around 180K the filters and the condensers are cool down with the second LN2 circulating pump. Filling Once the cryostats and TPC are cold, LAr is introduced in the cryostat. Normal operations LAr is continuously purified by means of an external LAr pump (1 per module but inter-connected). 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 SBN-FD/NP01

Current P&IDs 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Larg storage tank, Filling filters, Regeneration system Air compressed supply system Regeneration system Filling filters 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

LN2 storage & LN2 distribution LN2 storage tank LN2 phases separator LN2 TS manifolds LN2 circulating pumps 2 running, 1 spare 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Cryostat, filters, condensers Emergency GArg condenser Boil off GArg condensers LArg Circulating filter Boil off GArg filters LArg Circulating pump 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Analysers system 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Operation modes 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Operation Mode PUMP DOWN Vacuum pumps 1-Helium leak test on all flanges and welds not previously tested during installation, 2-when OK opening valves on the filters, 3-when OK pressurization with gas from Tank and closing the Larg pump outlet valve to not by-pass the filter Vacuum pumps 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Operation Mode PUMP DOWN 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Operation Mode COOL DOWN 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Operation Mode COOL DOWN WHEN T>170K 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Operation Mode COOL DOWN WHEN T>170K 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Operation Mode COOL DOWN WHEN T<170K 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Operation Mode COOL DOWN WHEN T<170K & FILLING 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Operation Mode NORMAL OPERATION 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Operation Mode NORMAL OPERATION 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

Operation Mode EMPTYING 03.3.16 Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01