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

2. Factor ~13 faster per DU (both string concept)
Design DU deployment
Since January 2009 NIOZ involved
Exchange of ideas for deployment of DU in string concept
Constraint
ANTARES
KM3NeT
#lines 12
300
deployment period
2 year
4 year
#deployments/yr 6 75
Factor ~13 faster per DU (both string concept)

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 Deployement meeting NIOZ-NIKHEF
1 DU, densily packed
One DU can be densed packed in one third of a standard ISO 20’container (LxWxH=6x2.4x2.6m)
Each DU is connected to the next one. On board more containers can be connected (dry mateble)., depends on the practicle nuimber of DUs in one sea operation versus wetmateble connectors and the min/max number to do physics.
After deployment the package will raise by a trigger (eventualy extra empty spheres can be added to increase the bouycing.
After de cable drums are empty they fall apart and float to the surface.
Emit eoc and ropes on 2 sides

6. DU Deployement meeting NIOZ-NIKHEF
Drum detail
One DU can be densed packed in one third of a standard ISO 20’container (LxWxH=6x2.4x2.6m)
Each DU is connected to the next one. On board more containers can be connected (dry mateble)., depends on the practicle nuimber of DUs in one sea operation versus wetmateble connectors and the min/max number to do physics.
After deployment the package will raise by a trigger (eventualy extra empty spheres can be added to increase the bouycing.
After de cable drums are empty they fall apart and float to the surface.
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 Totals; 1+1 PJBs 10+1 SJBs 300 DU nodes 6000 STO-OMs 186000 PMTs
top block diagram subsea part meetings with WP7 (18+19/2)
DU1
20x
Totals;
1+1 PJBs
10+1 SJBs
300 DU nodes
6000 STO-OMs
PMTs
STO20
OM20
SJB1
30x
MEOC
PJB1
DU30
10x
MEOC
PJB2
SJB10
level 4
level 3
level 2
level 1
The OM fits in the logic top diagram of the subsea part of the detector.
This diagram can be used as start for reliability and availability calculations.
Appropriate methods and formulea are expected from WP7.
It is also the start of the PBS numbering to keep track in sub projects from manufactering to integration and documentation and will possible used as setup for budgets.
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. Power layout Totals; 1(+1) PJBs 10+1 SJBs 300 DUs 6000 OMs 186000 PMTs
10kV
400V
Main cable
PJB
data
apd
CPUs
Clck
GPS
Lcw
broadcast
Clck, cal., s.c.
Power
logic
assoc. science
channel
Shore station
associated science SJB
distributed secondary junction box
AWG
STO-OMs
PMT c
10Gbps l 1
PMTs
3V3
STO-OM
serdes DU S

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

11. Power 10 KV distribution workout of specifications / meeting with WP5 / visits to PBF, JDR
Shore 10 kV globals:
Q≈90 kW, 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 kV
Out off at 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 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, 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
Just as acquaintance.
PBF NIKHEF
JDR NIOZ, NIKHEF

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!
Just as acquaintance.
PBF NIKHEF
JDR NIOZ, NIKHEF

16. Thanks for the attention

17. Power layout workout of specifications / meeting with WP5 in Dec / visits to PBF, JDRJB as
10 kV distribution
400 V distribution
DU/STO/OM distribution
Shore 10 kV globals:
Q≈90 kW
5.6 kVdc ≤ Uout ≤ 10 kVdc
h>80%
+400 V and -400 V interleaved used.
minimizing i2R,
minimizing cross section,
3 wires Acu≈8 mm2
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%
MEOC
Vdrop ≤1.3kV
Acu 15mm2
Sea return
Nodes switchable.
elimination of faulty strings
elimination of faulty branch part
10 kV/400 V globals:
Nº≈11
Q≈6 kW
±400 V ≤ Uout ≤ ±360 V
h>80%
Output at kV
Out off at kV
Slow control at 4.5 kV