1. Progress on the Vertical Electro- Optical Cable P.Kooijman UU/UVA/Nikhef

2. Design criteria Low drag ≥11 fibres Fibre break-out at each floor Two copper conductors DC/DC converter incorporated  Pressure Balanced Oil Filled Marseille 29-31 January 2013 KM3NeTcollaboration meeting -- Progress on VEOC 2

3. Present design Two halves 6.3 mm LDPE tube 12 Draka G.657 single mode Bend Bright fibres 2 AWG18 copper conductors (insulated) Siemens Midel 7131 oil. Marseille 29-31 January 2013 KM3NeTcollaboration meeting -- Progress on VEOC 3 Bottom of String Module 2 fibre penetrator Break-Out Box Break-out Electro- Optical cable 1 fibre penetrator 11 fibre penetrator DOM Optical Fan-out Module Bottom HalfTop Half

4. Break-Out Box (BOB) Marseille 29-31 January 2013 KM3NeTcollaboration meeting -- Progress on VEOC 4 VEOC in VEOC out BEOC vent DC/DC converter Oil filler hole closed after VEOC filled O-ring VEOC part BEOC part

5. BOB in real life Marseille 29-31 January 2013 KM3NeTcollaboration meeting -- Progress on VEOC 5 BOB totalTop of Penetrator Fibre container with oil filler BEOC flange

6. Penetrator Decided to go with conventional nut secured penetrator rather than conical plug Main reasons are for ease of assembly Also plug turns out to be quite fragile (scratches) Marseille 29-31 January 2013 KM3NeTcollaboration meeting -- Progress on VEOC 6 HIER WERKTEKENING

7. Penetrator in real life Marseille 29-31 January 2013 KM3NeTcollaboration meeting -- Progress on VEOC 7

8. Test - 1A VEOC had somewhat different design BOB Glue used  Now welded – Much more reliable and a lot easier and more pleasant – Consultant PE welding Fibre and Copper routing same as now. No Break out, just BOB Marseille 29-31 January 2013 KM3NeTcollaboration meeting -- Progress on VEOC 8

9. Assembly of VEOC 9Marseille 29-31 January 2013 KM3NeTcollaboration meeting -- Progress on VEOC

10. Test at 5000 m Deployed vertically at 5000 m depth in Atlantic Measured attenuation in fibres Checked for leaks Pressure distribution over cable Marseille 29-31 January 2013 KM3NeTcollaboration meeting -- Progress on VEOC 10

11. Test – 1A Pressure has effect but.... – One side affected before submersion – Test while dismantling boxes showed return to ~0db when other container was opened – Fibres inside containers were probably pinched and were very sensitive fibre – Effect could be mostly reproduced in the lab The cable survived in tact and did not leak Doesn’t need kit gloves Marseille 29-31 January 2013 KM3NeTcollaboration meeting -- Progress on VEOC 11 5000 m 2 1 0 bar -6 -5 -4 -3 -2 0 db

12. Schedule At present 3 cables (i.e. 6 halves) are being prepared for the deployment tests in April – Two will have only copper for the first mechanical tests – One with fibre also and with full breakout to DOM Spheres PPM-DU cable follows Marseille 29-31 January 2013 KM3NeTcollaboration meeting -- Progress on VEOC 12