KM3NeT-IT The Capo Passero Infrastructure M.Anghinolfi –INFN-Genova

The present status Site: 36° 16’ N, 16° 06’ E, about 40 NM from the coast depth of 3350 m; Main cable: Length (Km): 100 Max Voltage: 10 kV DC Max Current: 8 Amp Number of fibres: 20 Shore station: Harbor of Porto Palo 150 km from Catania electrical supply up to 800 kVA UPS up to up t 159 kVA fibre connection at 1 Gbps to LNS communication is inserted inside the GARR-X network

What we have NOW Power Supply Output voltage: 0-10 kV DC Output current: 0 -5 A Cable termination frame Unfolds the main cable to 3 ROV matable output ports converts the supplied voltage (-10 kV DC) to 375V DC up to 10kW 8 out of the 20 optic fibres of the main cable are available at the 3 outputs 8 floor tower connected to one output on march 2013 Tower 8 Floor 8m length, 40 m spacing 4 10” PMTs per floor

Sea operations In 2013 two major sea campaigns took place in the site of Capo Passero. Both of them were carried out by the MTS/FUGRO Chance Company. March was dedicated to the deployment of the first DU, July and was dedicated to a full survey and a subsea mapping

SITE Characteristics Continuous monitoring since March 2013 Mean 1 pe counting rate on 10”PMTs: ~ 50/65 kHz Burst fraction (>100kHz): 1-2 % bio sound continuous monitoring Sea current velocity: low to moderate (average 2-3 cm/s)

KM3-IT PHASE 1. PON Poject: o Funded by 20 MEuro to be spent before November 2014 o Aimed to the realization of a sea bed infrastructure and a first DU block in the site compatible to the available 8.5 kW power and exploiting the 20 optic fibres composed by:  8 towers a la NEMO (14 floors with 6 10” PMTs per foor)  24 strings with 18 DOMs  Sea bed network to connect to the DUs composed by: o NEW Cable Termination with 5 outputs o Interlink cables o 4 Secondary Junction Boxes : o 1 SJB for the 8 towers o 2 SJBs for strings o 1 SJB for EMSO

The Layout Result from various compromises: Sea deployment operations constraints Optimized detection efficiency DC/DC converter power limitation (8.8 kWatt) Uncertainty on the schedule of the NEW Cable Termination CTF: Cable Termination (Frame) : Secondary Junction boxes : Tower DU : String DU EMSO node

PPM DU

Installation sequence

The New Cable termination frame : Three companies contacted : ALCATEL, L3-MARIPRO, SEACON. Likely not available before mid 2015 The Secondary Junction boxes (SJBs): Serve a group of up to 12 detection units Include three pods with different functionality:  a power pod (JPP)to manage the power supply towards the DUs  an optic pod(JOP) to manage the optical data flux.  an electronic pod( EP) for the control and the monitoring of the system Modular design to optimize the assembly Will be assembled locally The cabling Includes the cables from the CFT to each SJB and from the SJB to each detection unit. Tender is ongoing: Ocean Design and SEACON companies contacted

The Secondary Junction Box Layout design completed Dry connectors & Internal cabling ordered Power boards designed and produced, to be qualified Control boards designed ordered Optical Components partially ordered Mechanics support designed The three power, control and optical vessels The manifold ROV mate connectors

Optical network Preliminary design available Optical budget evaluated and Full simulation of the network planned Some optical components alredy ordered?? Available in ?? Differenze rispetto a MEUST?? Solo connettori al posto di splices?

Power network DC power network, up to 10 kV max DC monopolar power transmission system from shore to MVC 375V bipolar power distribution system from MVC to DUs and floors. The Secondary JB hosts the system to distribute, monitor and control the power coming from the MVC to the DU. Its main features are: Distribution of 375 V coming from the MVC to the DUs and monitoring of all electrical parameters, Voltage conversion from 375 V to low voltages required by all the electrical loads, Remotely operated switches in all the output lines with a soft start system (100ms controlled voltage ramp), Output short circuit protection, Time-out system that automatically actuate all the switches of the output lines in case of loss of communication, Output lines current threshold remotely settable and Autonomous switch off for over current threshold. Boards are in production. Redesign of the DC/DC converter in VEOC to increase input voltage range. Design redy, first prototype ready on March, Power network calculations done and cable sizing done (tender ongoing) Full simulation of the network underway

Sea operations The deployment of the sea bed network and the first block of DU will be assigned to a private Company by a public tender. The activity will start in 2014 with the deployment of the test string and continue with the seafloor network, followed by the installation of 8 towers and 24 strings. Preferred operational period in the Ionian Sea is between March and October. All in all 11 Marine operations are planned with an overall 50 days offshore operation. This includes contingency for e.g. bad weather planning. Tender procedure started: invitation sent, will be assigned on January, 21

Milestones PPM DOM deployment & connection : April 2014 Installazione manifold : autunno 2014 (ott-nov) Installazione JB (solo 2): autunno 2014 (ott-nov) Fornitura cavi interlink (entro nv da contratto) Installazione delle torri (non ancora definito - ma nn capisco cosa interessi questa cosa agli altri)

Costs Deep sea infrastructure : Secondary JB (SJB) including interlink cables to DUs: 0.8 x 5 = 4.0 Interlink cables from CTF to SBJs: 0.3 New CTF (estimates): 0.7 TOTAL 5.0 Towers 8 x 0.68 = 5.5 TOTAL 5.5 Sea Operations: indicative for the installation of the full sea bed infrastructure and the DUs deployment of the sea infrastructure DUs: 1.5 Deployment of the DUs :1.5 TOTAL 3.0