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Status DU deployment and detector layout studies

This study focuses on the deployment and detector layout of the DU (Detector Unit) in the string concept for underwater exploration. It covers technical requirements, geometry, buoyancy, drag, and deployment methods.

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Status DU deployment and detector layout studies

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  1. Status DU deployment and detector layout studies Eric Heine, Ruud Groenewegen, Marck Smit Nikhef/NIOZ SeaWiet

  2. Design DU deployment • Since January 2009 NIOZ involved • Exchange of ideas for deployment of DU in string concept • Constraint

  3. General requirements • Dimensions of a deployment structure must be narrower than 2.4 m*2.4 m*6 m for transportation • Optimise # wet-mateable connectors • 10 branches of 30 DUs • or 30 branches of 10 DUs • or anything else (QA!) • Phased deployment, modular design - Optimise # of sea operations (risk analysis, costs)

  4. Technical requirements(preliminary) Geometry • DU length 600 m • First storey 100 m above seabed • 21 STO-OM • Depth seabed 5000 m Seafloor position tolerance: : +/- 5 m (relative position) Deployment of multiple DUs Buoyancy • Buoy at the top • Weight of a optical module in air is approximately 30 k, positive buoyancy per sphere = 12.5 kg Drag • Top displacement better than ~5 m at usea = 5 cm/s, survival current: 30 cm/s • Dimensions DWDM: appr 100 x 50 x 15 mm • e/o cable ~ 20 mm , ropes ~4 mm 

  5. DU Deployementmeeting NIOZ-NIKHEF 1 DU, densily packed Emit eoc and ropes on 2 sides

  6. DU Deployementmeeting NIOZ-NIKHEF Drum detail 3 DUs fit in a ISO 20’ container Self floating

  7. Next steps • Optimise designs • Organise tests in 30 m high water basin • Verify unfurling of a single STO-OM+drum model • Verify unfurling of a DU scale model (~1:10) • Optimise size of the SJB (QA and physicists demands)

  8. QA STO1 OM1 top block diagram subsea partmeetings with WP7 (18+19/2) DU1 20x Totals; 1+1 PJBs 10+1 SJBs 300 DU nodes 6000 STO-OMs 186000 PMTs STO20 OM20 SJB1 30x MEOC PJB1 DU30 10x MEOC PJB2 SJB10 level 4 level 3 level 2 level 1 Glossary PJB Primary Junction Box SJB Secondary Junction Box (branch, sector) DU Detector Unit (vertical structure, string, tower) STO Storey (floor) OM Optical Module Next:Waiting on proper formula to optimize the detector design

  9. Lcw Lcw Lcw Totals; 1(+1) PJBs 10+1 SJBs 300 DUs 6000 OMs 186000 PMTs Power layout Shore station GPS o STO-OM Clck broadcast Clck, cal., s.c. c 400V PMT serdes apd 3V3 CPUs PMTs Clck o data c logic apd PMT STO-OMs apd o assoc. science channel l 1 S logic 10Gbps apd o Power 10kV Main cable Main cable DU DU PJB PJB o o AWG 400V 400V o o distributed secondary junction box 10kV 400V 400V 400V associated science SJB

  10. Floorplan Homogeneous structure (CDR p.40) Ring structure (CDR p.40) Length/sector ≈ 2*1750mPower/sector ≈ 9000W Power supplies 20 DU: 324 Length/sector ≈3500mPower/sector ≈9000W Power supplies 22 DU: 312

  11. Power 10 KV distributionworkout of specifications / meeting with WP5 / visits to PBF, JDR Shore 10 kV globals: Q≈90 kW, 5.6 kVdc ≤ Uout ≤ 10 kVdc, h>80% MEOC: Vdrop ≤1.3kV, Acu 15mm2, Sea return 10 kV/400 V globals: Nº≈11, Q≈9 kW, ±360 V ≤ Uout ≤ ±400 V, h>90% Output at 5.7 kV Out off at 5.2 kV Slow control at 4.5 kV

  12. Power 400V distribution +400 V and -400 V interleaved used. minimizing i2R loss, minimizing cross section, 3 wires Acu≈8 mm2 Nodes switchable. elimination of faulty strings elimination of faulty branch part as JB

  13. Power DU, STO-OM level HV circuit PMT 10 dynodes, cathode voltage -800 V - -1200 V Vripple <150 mV/dynode, dV/dt < 75mV/ms Stabilization 0.95% on 38% input variation Vinput 3.3 V Load < 4.5 mW BOB: protection by resetable fuses Q≤ 15 W, 300 V ≤ Uin ≤ 400 V Cable: Acu≈0.65 mm2 OM:Central conversion 400 V to 12 V 12 V to 5 V 12 V to 3.3 V Overall h>80% proto

  14. Visit to PBF • Visit to PBF (power supplies) • Representatives in 11 European countries by ACAL • Academic design group • Interested in small series, special and innovative • power solutions • Interested in 10 kV/400 V conversion • N.B. • Award for innovative designs from Department of • Trade and Industry in 2008 • Built the string power module and local power • module for Antares

  15. Visit to JDR Visit to JDR (sub marine cables) Representatives in 5 countries world wide. Academic staff for calculations and design. Scope: Seismic exploration (market leader) Defense technology, ROV, Oil & Gas, Innovative Solutions Projects besides KM3NeT: Cable for OceanNet on 6000m depth, optic and power. Cable for ICE CUBE, stable impedance under pressure, low temperatures. Cable offer for Antares Power cables for off shore wind farms ROV project with Ifremer N.B. No production limit on fibers in a cable (KM3NeT scale) Fish baits are reality!

  16. Thanks for the attention

  17. as JB Power layoutworkout of specifications / meeting with WP5 in Dec / visits to PBF, JDR DU/STO/OM distribution 400 V distribution 10 kV distribution protection by resetable fuses in BOB Q≤ 15 W 300 V ≤ Uin ≤ 400 V Cable Acu≈0.65 mm2 Central conversion 400 V to 12 V 12 V to 5 V 12 V to 3.3 V Overall h>80% +400 V and -400 V interleaved used. minimizing i2R, minimizing cross section, 3 wires Acu≈8 mm2 • Shore 10 kV globals: • Q≈90 kW • 5.6 kVdc ≤ Uout ≤ 10 kVdc • h>80% Nodes switchable. elimination of faulty strings elimination of faulty branch part MEOC Vdrop ≤1.3kV Acu 15mm2 Sea return 10 kV/400 V globals: Nº≈11 Q≈6 kW ±400 V ≤ Uout ≤ ±360 V h>80% Output at 5.7 kV Out off at 5.2 kV Slow control at 4.5 kV

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