Presented by E.G. Anassontzis University of Athens on behalf of NESTOR COLLABORATION 5-8 October 2003 NIKHEF - Amsterdam Title Mechanics for “km 3 ” neutrino.

Presented by E.G. Anassontzis University of Athens

on behalf of NESTOR COLLABORATION

 5-8 October 2003

NIKHEF - Amsterdam

Mechanics for “km3” neutrino telescope

VLVνT Workshop

• Modular system with built in redundancy

• “All” connections to be made in air

• Use ships of opportunity and non highly specialized surface vessels for deployment

• Use locally available transport vessels

• No use of bathyscaphs or ROVs

• Retrieval and expandable

• Inoxidable material

Design considerationDesign consideration

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

Inoxidable material

• Stainless steel > inoxidable > many alloys > sensitive in cavity corrosion > steel ropes and shackles

• Aluminium > special alloy > anodized

• Titanium > inoxidable > best > light and strong

• Plastics > PVC, Polyethylene > ropes

• Glass fibers > light and strong > water ingress?

• Glass > PMT > housing > inoxidable

Material considerationsMaterial considerations

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

Isolation with plastic or rubber

TitaniumTitanium

NESTOR towerNESTOR tower

32 m diameter

30 m between floors

144 PMTs

20 000 m2

Effective Area

for E>10TeV

Energy threshold as low as 4 GeV

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

with positioning transponders

Anchor Unit with

NESTOR starNESTOR star

Alu star

Optical Modules

Titanium sphere

Optical Modules

Titanium sphereTit star

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

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

Loading a star

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

Preparing a star

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

Folded star

Full Machine Shop

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

Full Machine Shop

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

sphere

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

Titanium sphereTitanium sphere

Sphere open

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

Titanium sphereTitanium sphereopen with electronics open with electronics

standstand

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

Star just below surface during tests

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

Star just below surface during deployment

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

Anchor Unit with Anchor Unit with Environmental Environmental

InstrumentationInstrumentation

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

Anchor Unit with Anchor Unit with Environmental Environmental

InstrumentationInstrumentation

Junction box, connectors sides

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

Junction box, connectors sides

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

JB box

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

JB box with connectors on the side (simulation)

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

Data from a depth of 4000 m

Environmental data from the Junction BoxDuring deployment

Since deployment

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

March 2003March 2003

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

Successful deployment of one NESTOR star with 12 Optical Modules to 4000m

using the

cableship RAYMOND CROZE (FranceTelecom)

30th of March: The first deep sea muon data transmitted to shore; through a 30km long electro-

optical cable to the Methoni counting room

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

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