ICARUS Cold Vessels Thermal insulation Project progress report

The Cold Vessels and thermal insulation of ICARUS, which is running (successfully) to day in LNGS, will not be re-used at CERN for several (good) reasons. These fundamental parts of the detector are designed ex-novo by external specialists. Mechanic structures: A. Castellani Thermal Insulation: GTT The good integration of their projects and the technical performances control is crucial and is our job.

Typical vessel transversal section (1-1).

Wall and corner aluminium alloy extruded shapes.

Corner assembly.

Top wall.

Removable end cap.

CONFIDENTIAL Stainless steel corrugated membrane 304 L – 1.2 mm Primary Barrier Plywood Reinforced polyurethane foam Composite material Secondary Barrier Concrete wall covered with a moisture barrier Mastic Plywood Standard components Industrially pre-fabricated by independent suppliers One block Pre- fabricate d panels Pre- fabricated membrane sheets Insulation in TPS (1) areaInsulation above 5m height (1) Thermal Protection System Containment Detailed Description

CONFIDENTIAL Plywood boards 1m wide by 3m long Typical range of thicknesses : between 250 to 350mm Insulation layer Secondar y barrier Metallic component onto which the primary barrier is welded Plywood boards Flat panel with TPS* Flat panel without TPS* *Thermal Protection System Modular Insulating Panels

CONFIDENTIAL Tight Secondary Barrier Tight Primary Barrier Continuity of the Secondary Barrier by bonding Closed primary space Closed secondary space Design Concept at TPS Level

CONFIDENTIAL Liquid tight Primary Barrier Primary space (Only one space) Design Concept Above TPS level

ICARUS

Conclusion Last Monday we met at CERN representative of both Parts and we organised together with them the future work, based on the present results. The principal open problem was the mechanical project of the supporting system of vessels into the thermal insulation, ensuring the requested rigidity, but reducing thermal bridges. Another important option was the definition of the thickness of the insulating material vs the requested performances (10 W/m2); such a value will be guaranteed with 60 cm thickness on the bottom and 40 cm elsewhere.