Status of the KM3NeT Project What happened so far The KM3NeT Conceptual Design Report The...
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![Page 1: Status of the KM3NeT Project What happened so far The KM3NeT Conceptual Design Report The Preparatory Phase: Towards Implementation 3rd Workshop.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649d585503460f94a3718b/html5/thumbnails/1.jpg)
Status of the KM3NeT Project
What happened so far
The KM3NeT Conceptual Design Report
The Preparatory Phase: Towards Implementation
3rd Workshop on Very Large Volume Neutrino Telescopes (VLVT08),Toulon, France, April 22-24, 2008
Uli KatzECAP / Univ. Erlangen
22.04.2008
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22.04.2008 U. Katz: KM3NeT 2
KM3NeT: From the idea to a concept
11/2002 4/20089/20062/20069/20053/2004
Firstconsultations of
ANTARES, NEMOand NESTOR
KM3NeT onESFRI Roadmap
KM3NeT on ESFRIList of Opportunities
Design Studyproposal submitted
The KM3NeTConceptual
Design Report
Begin of Design Study
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22.04.2008 U. Katz: KM3NeT 3
Major achievements
Science & technology- Successful prototype deployments by NEMO and NESTOR
- Installation and operation of ANTARES
A large deep-sea neutrino telescope is feasible!
Politics & funding- Endorsement by ESFRI and ApPEC
- Funding through EU: Design Study, Preparatory Phase
- Funding through national authorities:pilot projects, commitments for KM3NeT
Towards construction - Strong collaboration
- Design concepts in CDR
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22.04.2008 U. Katz: KM3NeT 4
The reference detector
Sensitivity studies with a common detector layout Geometry:
- 15 x 15 vertical detection units on rectangular grid,horizontal distances 95 m
- each carries 37 OMs, vertical distances 15.5 m
- each OM with21 3’’ PMTs
This is NOT the final
KM3NeT design!
Effective areaof reference
detector
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22.04.2008 U. Katz: KM3NeT 5
Science case revisited
Astroparticle physics with neutrinos- “Point sources”: Galactic and extragalactic sources of
high-energy neutrinos
- The diffuse neutrino flux
- Neutrinos from Dark Matter annihilation
Search for exotics- Magnetic monopoles
- Nuclearites, strangelets, …
Neutrino cross sections at high(est) energies Earth and marine sciences
- Long-term, continuous measurements in deep-sea
- Marine biology, oceanography, geology/geophysics, …
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22.04.2008 U. Katz: KM3NeT 6
Point source sensitivity
Based on muon detection
Why factor ~3 more sensitive than IceCube?- larger photo-
cathode area
- better direction resolution
Study still needs refinements
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22.04.2008 U. Katz: KM3NeT 7
Diffuse fluxes
Assuming E-2
neutrino energy spectrum
Only muonsstudied
Energy reconstruction not yet included
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22.04.2008 U. Katz: KM3NeT 8
Configuration studies
Various geometries and OM configurations have been studied
None is optimal for all energies and directions Local coincidence requirement poses
important constraints on OM pattern
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22.04.2008 U. Katz: KM3NeT 9
KM3NeT design goals
Sensitivity to exceed IceCube by “substantial factor” Core process:
+N +X at neutrino energies beyond 100 GeV Lifetime > 10 years without major maintenance,
construction and deployment < 4 years Some technical specifications:
- time resolution 2 ns
- position of OMs to better than 40 cm accuracy
- two-hit separation < 25 ns
- false coincidences dominated by marine background
- coincidence acceptance > 50%
- PM dark rate < 20% of 40K rate
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22.04.2008 U. Katz: KM3NeT 10
Technical implementation
Photo-sensors and optical modules
Data acquisition, information technology and electronics
Mechanical structures
Deep-sea infrastructure
Deployment
Calibration
Associated science infrastructure
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22.04.2008 U. Katz: KM3NeT 11
A segmented anode and a mirror system allow for directional resolution
First prototypes produced
A standard optical module, as used in ANTARES
Typically a 10’’ PMT in a 17’’ glass sphere
Optical modules: standard or directional
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22.04.2008 U. Katz: KM3NeT 12
… or many small photomultipliers …
Basic idea: Use up to 30 small (3’’ or 3.5’’) PMTs in standard sphere
Advantages: - increased photocathode area
- improved 1-vs-2 photo- electron separation better sensitivity to coincidences
- directionality
Prototype arrangements under study
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22.04.2008 U. Katz: KM3NeT 13
… or hybrid solutions
Idea: Use high voltage (~20kV) and send photo electrons on scintillator;detect scintillator light with small standard PMT.
Advantages:- Very good photo-electron
counting, high quantum eff.
- large angular sensitivity possible
Prototype development in CERN/Photonis/CPPM collaboration
Quasar 370(Baikal)
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22.04.2008 U. Katz: KM3NeT 14
Photocathode news
New photocathode developments by two companies (Hamamatsu, Photonis)
Factor 2 in quantum efficiency factor 2 in effective photocathode area!
Major gain in neutrino telescope sensitivity!
Hamamatsu
Photonis
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22.04.2008 U. Katz: KM3NeT 15
Mechanical structures
1. Extended tower structure: like NESTOR, arm length up to 60 m
2. Flexible tower structure: like NEMO, tower deployed in compactified “package” and unfurls thereafter
3. String structure: Compactified at deployment, unfolding on sea bed
4. Cable based concept: one (large) OM per storey, separate mechanical and electro-optical function of cable, compactified deployment
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22.04.2008 U. Katz: KM3NeT 16
Deep-sea infrastructure
Major components:- main cable & power transmission
- network of secondary cableswith junction boxes
- connectors
Design considerations:- cable selection likely to be driven
by commercial availability
- junction boxes: may be custom-designed, work ongoingin NEMO
- connectors: Expensive, reduce number and/or complexity
NEMO junction box design
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22.04.2008 U. Katz: KM3NeT 17
A green power concept for KM3NeT?
Idea: Use wind and/or solar power at KM3NeT shore installations toproduce the required electrical power.
Requires investment of 4-5 M€.
Can only work if coupled to a larger (public) power network.
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22.04.2008 U. Katz: KM3NeT 18
Deployment: On the surface …
Deployment operations require ships or dedicatedplatforms.
Ships: Buy, charter or use ships of opportunity.
Platform: Delta-Berenike,under construction in Greece, ready summer 08
Delta-Berenike: triangularplatform, central well with crane,
water jet propulsion
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22.04.2008 U. Katz: KM3NeT 19
… and in the deep sea Deep-sea submersibles
are likely needed for- laying out the deep-sea
cable network- making connections to
detection units- possibly maintenance and
surveillance Remotely operated
vehicles (ROVs) available for a wide range of activities at various depths
Use of autonomous undersea vehicles (AUVs) under study
Commercially available ROVs
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22.04.2008 U. Katz: KM3NeT 20
The associated science installation
Associated sciencedevices will be installed at variousdistances aroundneutrino telescope
Issues:- interfaces
- operation withoutmutual interference
- stability of operationand data sharing
Synergy effects
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22.04.2008 U. Katz: KM3NeT 21
The candidate sites Locations of the
three pilot projects:- ANTARES: Toulon- NEMO: Capo Passero- NESTOR: Pylos
All appear to besuitable
Long-term sitecharacterisationmeasurementsperformed and ongoing
Site decision requiresscientific, technologicaland political input
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22.04.2008 U. Katz: KM3NeT 22
Site characterisation: An example
Important parameter:water transparency
Pylos(460 nm)
Capo Passero
Also: optical background,sea currents, sedimentation,
biofouling, radioactivity, …
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22.04.2008 U. Katz: KM3NeT 23
The KM3NeT Preparatory Phase “Preparatory Phase”: A new EU/FP7 funding
instrument restricted to ESFRI projects. KM3NeT proposal endorsed, funded with 5 M€,
coordinated by Emilio Migneco / LNS Catania 3-year project, 3/2008 – 2/2011;
kick-off meeting in Catania, 10-13 March 2008 Major objectives:
- Initiate political process towards convergence(includes funding and site selection/decision)
- Set up legal structure and governance- Strategic issues: New partners, distributed sites, extendibility- Prepare operation organisation & user communities- Organise pre-procurement with commercial partners- Next-step prototyping
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22.04.2008 U. Katz: KM3NeT 24
Timeline towards construction
Note: “Construction” includes the final prototyping stage
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22.04.2008 U. Katz: KM3NeT 25
Your copy of the CDR
There is a copy of the CDR
for each participant of the
VLVnT08 workshop waiting
for you outside the auditorium!