1. 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

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

3. 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 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)
Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

4. 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
Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

5. 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 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.
Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

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

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

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

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

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

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

12. 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
Michel CHALIFOUR P&IDs Meeting SBN-FD/NP01

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

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

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

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

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

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

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

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

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