KM3NeT WPF/L NIKHEF- MECABAR 1 A.Cosquer on behalf of the KM3NeT consortium MECABAR PROJECT PLAN 1- Context 2- 3D views and responsibilities 3- Qualification Plans and objectives 4- Next steps and conclusions

KM3NeT WPF/L NIKHEF- MECABAR Context Some fundamentals hypothesis : - Reliability of DU (10 years) and deployment - crew safety - Compactness DU - Storey length around 6 m, net buoyancy for equipped storey 300 N - The distance between storey is 40m - The design of DU and deployment concept is totally imbricated In the TDR, there are three options for the detection unit structure : The bar detection unit The string detection unit The triangle detection unit The mecabar project is based on ‘a bar unit concept’ Design of TDR

KM3NeT WPF/L NIKHEF- MECABAR Context Before to speak about compactness : some value of value about Nemo And Antares project … Volume of the package : Lenght : 16m Width : 3.50 Height : around 3m Deployment and recovery on the sea surface TDR bar detection unit Volume of the package (20 storeys) : Lenght : 6 m Width : 2.5m Height : 2.5 m (TDR) 16m 3.50m 3 m Deployment on the sea bed, by the top

KM3NeT WPF/L NIKHEF- MECABAR 4 2.1) Package of the DU 2 – 3D Views and responsibilities Deployment tools 20 storeys with 6 OMs 13’ Anchor + base (CPPM) (INFN Pise) Release system (INFN Pise, CPPM) 1.25 m 6m 1.7 m Basket OMs INFN Genova

KM3NeT WPF/L NIKHEF- MECABAR 5 Before to describe each subsystem, principal components of DU DU Storey + assembly storey anchor Mechanical ropes Floatation system -Mechanical structure Witch contains 6 OMs - Improve compactness with 6 storeys assembly. -Attachment of electronics vessels - Storage of backbone cable 2 – 3D Views and responsibilities -anchoring the string on the sea bed -contains the release system witch unlocking DT and package of DU - Link between the storey - Orienting the storey - Due to compactness safety margins for the buoyancy Deployment tools base Allow the immersion of the structure in the water Put the package on the seabed with a cable Connexion of line Release of the line

KM3NeT WPF/L NIKHEF- MECABAR 6 2 – 3D View ans responsibilities 2.2) Assembly of 6 storey ‘exploded’ of 6 storeys 6 stacked storeys Height : 530 mm Rm : yellow cone with angular acceptance Rm : rotation of 90 degree floor 5, 3 and 1 Translation vector : 40 meters Data for Physics simulation

KM3NeT WPF/L NIKHEF- MECABAR 7 2 – 3D Views and responsibilities Details of baskets witch support OMs Basket One OM INFN genova contribution One prototype built Work in progress : Integration of multi PM on the lightly modified squeleton Fredom area for electronics vessels Floor N1 Floor N2

KM3NeT WPF/L NIKHEF- MECABAR 8 40 m of backbone Cable outer diameter 16mm (capo passero backbone) Thin panel to to put backbone Details of thin panel Details of the support of the backbone 2 – 3D Views and responsibilities External face to receive cartridge of Dynema Ø 4mm Witch can accept 16 at 25 mm outer diameter

KM3NeT WPF/L NIKHEF- MECABAR 9 2 – 3D Views and responsibilities Some words about safety margins safety Possibilities to increase buoyancy 1)Use the area of electronics vessels to put additional buoyancy (empty glass sphere, SF) 2) Use the inside of pipe (80 X 50 X 4) And integrate Syntactic foam 18daN of buoyancy Or put inside Glass sphere (3M firm) working in progress (INFN Catania) X

KM3NeT WPF/L NIKHEF- MECABAR 10 12/201009/2010 Qualification phase N1 Qualification phase N2 Schedule of DU Qualification phase N3 05/2011 Iterative design Testing tank 3 – Qualification plan and objectives

KM3NeT WPF/L NIKHEF- MECABAR ) Qualification phase one 3 – Qualification plan and objectives Objectives : four successful deployment (DU contains 4 equipped storeys, 2 separators, 1 base) shallow water between 250 m and 350 m Immersion of DU in the water : OK Release of the deployment tools on the seabed : OK Unfurling command and validation of the bottom unfurling ligne sous tension : OK Instrumented line (LNS instrumentation)

KM3NeT WPF/L NIKHEF- MECABAR ) Qualification phase two 3 – Qualification plan and objectives Objectives : successful deployment (DU contains 10 equipped storeys, 2 separators, 1 base) shallow water around 700m Storeys are equipped With empty glass sphere 13’ 3.3) Qualification phase three Deployment of full mechanical DU (20 storeys)

KM3NeT WPF/L NIKHEF- MECABAR Conclusion 4 – Next steps and conclusions Thank your very much for your attention Status Drawings of all the components of storey have been done and send to subcontractors for The studies of anchor is almost finished : there is an interface work between the release system, deployment tools and the Deployment and recovery procedure has been done for the first qualification test Next steps Go on all the design aspect of Φ 1, 2, Work on the attachment of electronics vessel on the storey Conclusions : The qualification phase 1, 2, 3 is very interesting because from the ‘knowledge of the line (buoyancy, center of gravity, hydrodynamics calculation). It will be possible to make comparaison between test / calculations. Moreover, it will allow the validation of mechanical fonction (release, indexing, …).

KM3NeT WPF/L NIKHEF- MECABAR Conclusion 4 – Next steps Thank your very much for your attention