The LBNF cryostats Marzio Nessi, CERN 16 March 2017

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)

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

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

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

2016-2017 : ProtoDUNEs ~800 tons cold cryostats

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: https://edms.cern.ch/document/1738513

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

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

LBNF Cryostats Design Status

LBNF Cryostats Design Status

LBNF Cryostats Design Status

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  

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

Additional information MM.DD.YY Presenter's Name | Presentation Title

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: https://edms.cern.ch/document/xxxxxx This work has to be added to the initial calculation performed in version 1 https://edms.cern.ch/document/1510834 More detailed information about the on going structural assessment can be found in the Indico link below: https://indico.cern.ch/event/571287/

Engineering Structural Analysis 28.02.2017 LBNF cryostats

Engineering Structural Analysis 28.02.2017 LBNF cryostats

Engineering Structural Analysis 28.02.2017 LBNF cryostats

Engineering Structural Analysis 28.02.2017 LBNF cryostats

Engineering Structural Analysis 28.02.2017 LBNF cryostats

Engineering Structural Analysis 28.02.2017 LBNF cryostats

Engineering Structural Analysis 28.02.2017 LBNF cryostats

Engineering Structural Analysis 28.02.2017 LBNF cryostats

Engineering Structural Analysis 28.02.2017 LBNF cryostats

Engineering Structural Analysis 28.02.2017 LBNF cryostats

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 28.02.2017 LBNF cryostats

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 28.02.2017 LBNF cryostats