1. Sea Operations for “km3” neutrino telescope
Title
Sea Operations for “km3” neutrino telescope
E.G. Anassontzis
University of Athens
NESTOR COLLABORATION
5-8 October 2003
NIKHEF - Amsterdam

2. Deployment considerations
Modular system with built in redundancy
Detector configuration
Towers (NEMO, NESTOR) Strings with many light sensor points per deployment per depth level
Strings (ANTARES) Strings with several light sensor points per deployment
Connections to be made
in air (NESTOR)
in underwater (ANTARES, NEMO)
Use ships of opportunity and non highly specialized surface vessels for deployment
Use locally available transport vessels
Retrievable and expandable
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

3. …. Deployment considerations
Use ships of opportunity and non highly specialized surface vessels for deployment
Use locally available transport vessels
Use of bathyscaphs or ROVs ?
NO (NESTOR)
YES (ANTARES, NEMO) Dynamic positioning
Vessels with dynamic positioning
Short base line detector positioning
Sea state working conditions up to 4+ beaufort
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

4. Energy threshold as low as 4 GeV
NESTOR tower
NESTOR TOWER
with positioning transponders
32 m diameter
30 m between floors
144 PMTs m2
Effective Area
for E>10TeV
Energy threshold as low as 4 GeV
NESTOR TOWER
Anchor Unit with
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

5. Folded star
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

6. Typical cable-laying ships
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

7. Some of DELTA VERENIKI’s heavy deployment equipment
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

8. Under Construction: to be commissioned at Pylos next spring
VERENIKI
DELTA VERENIKI
Central well-ballasted platform
Dynamic position, keeping station 5m
Operational up to wind/sea state force 4 beaufort
Heave compensating winches
Each side 51m long
Height 2,3m, barrel height 6,3+1,2m, diameter 4,4 and 6,8
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

10. Anchor Unit on deck and just above the surface, during deployment
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

12. Star on the surface and just below, during deployment
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

14. Series of towers and/or strings
During deployment, we have to make less connections with towers than with strings
Series of towers and/or strings
Dynamically position of each system
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

15. Deployment of a tower
150 m
3 900 m
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

16. Deployment of a tower
150 m
3 900 m
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

17. Deployment of a tower
150 m
3 900 m
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

18. Deployment of a tower
4 000 m
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

19. Deployment schematic of towers
Shore Station
Electro-optical cable
Several km long
Main Buoy
Detector
Anchor
REBU
4000m
MARO
RERO
Depth, e/o cable and rope lengths not in scale
Deployment schematic
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

21. Simulation of deployment
Simulation of deployment or recovery of a NESTOR tower by Makai, Hawaii
Simulation of deployment ANTARES strings by ANTARES
MAKAI simulation snap shot
MAKAI simulation snap s
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

22. We can deploy jointly the km3 Very Large Volume v Telescope
Conclusions
ANTARES (with IFREMER) have shown that they can deploy string like detector with success
NEMO believe that they can deploy tower like detector
NESTOR have shown that they can deploy tower like detector with sucess
We can deploy jointly the km3 Very Large Volume v Telescope
VLVνT Workshop – 5-8 October 2003 – NIKHEF, Amsterdam NESTOR

23. NESTOR INSTITUTE

24. End
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