1. The LBNF cryostats
Marzio Nessi, CERN
16 March 2017

2. Membrane cryostats (LNG industry technology)
SS 1.2 mm primary membrane in contact with the liquid (primary containment)
secondary membrane : composite laminated material (secondary containment)
Insulation : reinforced polyurethane foam (5-6 W/m2)

3. Membrane cryostats LNG concept
LAr containment
Gas containment
LAr
SS GTT membrane
LNG insulation
SS skin
Carbon steel structure (ML460)
Carbon steel belt (ML460)
Warm cryostats : the ship
CERN has signed a co-operation agreement (in 2015)with the firm GTT in Paris which owns 80% of the market
87 K
290 K
LNG proprietary technology

4. 2015-2016 : WA105 DP first cryo demonstrator
SS 1.2 mm primary
secondary membrane : composite laminated)
Insulation : reinforced polyurethane foam (5-6 W/m2)
: WA105 DP first cryo demonstrator
First GTT type membrane cryostat
LAr TPC double Phase demonstrator inserted

5. 2016-2017 : ProtoDUNEs ~800 tons warm cryostats
NP04: single phase
NP02: double phase

6. 2016-2017 : ProtoDUNEs ~800 tons cold cryostats

7. LBNF Cryostats Design Status
65.84m
39 frames (1.6m)
18.94m
17.84m
8frames (1.6m)
2015 version 1
2016 version 2
Stp files available:

8. LBNF Cryostats Design Status
roof
Side wall belts.
Tolerance compliant
connections
end wall
New concept of inner warm membrane with
stiffened panels (version 2)
floor

9. LBNF Cryostats Design Status
Main design modifications to the outer warm structure
Improved bracing concept for the load carrying structure
Longitudinal belts design and connections
Roof optimisation and short wall interaction, longitudinal roof beams
Short wall design
Floor design, main connections, support conditions, access holes
Design of additional splices for compatibility with crane/shaft.
Corner design
Main portals and belts access holes (reinforced)
Decoupling warm structure and inner warm membrane
Main connections verification
Access and assembly issues

10. LBNF Cryostats Design Status

11. LBNF Cryostats Design Status

12. LBNF Cryostats Design Status

13. LBNF Cryostats Design Status
Each LBNF cryostat is made of:
- main profile: HL1100M, material: S460ML. Total length of profile (rough estimation): 3'670m. The longest profile is 13.7m.
 - secondary profile: HEB600, material: S460ML. Total length of profile 302m
- IPE500, material: S460ML. Total length of profile (rough estimation): 128m
warm membrane: material S460ML.Total surface (rough estimation): 4'326m2
quantity of M48 bolts (rough estimation): 17'000
Per one cryostat:
The main beams are: 3670m x 433kg/m = ~1'600T
The secondary beams : ~100T
The steel plate (SS?): 4326m2 x 12mm x 7.8T/m3 = ~400T

14. LBNF Cryostats Design Status
Final optimization still ongoing
Overall outer access system must be revisited (too many holes)
Working now on the installation sequence and tooling
The critical structural elements will go through a 1:1 model and test in the lab. Probably at the EPFL in Lausanne during 2017
The way to shim the structure on the floor remains to be optimized
We will continue to iterate with the SURF team how to lower down all components
Logistics of all this is a very critical issue
We plan a final internal review of the design version 2 in summer 2017

15. Additional information
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Presenter's Name | Presentation Title

16. Engineering Structural Analysis
Large effort at CERN for the structural analysis (5 CERN engineers involved + 1 consulting firm)
Here (next 11 slides) a list of recent published results:
This work has to be added to the initial calculation performed in version 1
More detailed information about the on going structural assessment can be found in the Indico link below:

17. Engineering Structural Analysis
LBNF cryostats

18. Engineering Structural Analysis
LBNF cryostats

19. Engineering Structural Analysis
LBNF cryostats

20. Engineering Structural Analysis
LBNF cryostats

21. Engineering Structural Analysis
LBNF cryostats

22. Engineering Structural Analysis
LBNF cryostats

23. Engineering Structural Analysis
LBNF cryostats

24. Engineering Structural Analysis
LBNF cryostats

25. Engineering Structural Analysis
LBNF cryostats

26. Engineering Structural Analysis
LBNF cryostats

27. Engineering Structural Analysis
We would like to close all these calculations and design for summer 2017
The structural analysis of all installation tools is the next step
We would like in 2018 to give our design for a verification to a US engineering consultant, to make sure all US rules are taken into consideration
If possible we would like to use the opportunity of the SBN near detector to construct a final prototype which includes all recent findings in the design, in particular the reinforced SS plates
LBNF cryostats

28. Milestones and Future Plans
Cryostats internal milestones (up to 2019)
final design review August 2017
get CERN finance committee approval for GTT engineering study, September 2017
final penetration design SP and DP by October 2017
define cold vessel final dimensions by December 2017
start GTT engineering study January 2018
List of material components to be ordered, Summer 2018
Installation sequence cold vessel, October 2018
Structural analysis cold vessel, November 2018
US consultant to verify warm vessel design (January 2018-April 2018)
get CERN finance committee approval for procuring warm vessel, September 2018
start warm vessel material procurement, January 2019
get CERN finance committee approval for procuring cold vessel, April 2019
start warm vessel material procurement, July 2019
get CERN finance committee approval for installing warm vessel, September 2019
get CERN finance committee approval for installing warm vessel, December 2019
finalize both contracts December 2019
LBNF cryostats