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Published byEdith Parsons Modified over 9 years ago
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KM 3 Neutrino Telescope European deep-sea research infrastructure DANS – symposium Maarten de Jong
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p travel time bending cosmic rays astronomy absorption space travel Astro-Particle Physics
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Energy spectrum of cosmic rays E [eV/particle] flux [(m 2 sr s GeV) -1 ] 10 10 27 1 per km 2 / year 1 per m 2 / second plateau 1.5 eV = 10 10 20 1 kg 1 m LHC
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Cosmic particle accelerator? radio images April 1993 – June 1998 V ~ 20000 km/s charged particle SN1993J – M81 V interstellar matter time
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Which particles? electronsprotons N p p neutrinos muons astronomy cosmic rays Synchroton radiation inverse Compton scattering e e
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p ++ p ++ ambient light 00 n Neutrino telescope: – origin cosmic rays – creation & composition of relativistic jets – mechanism of cosmic acceleration black hole
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“CERN in the sky” Neutrino astronomy
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1960 Markov’s idea: range of muon detect Cherenkov light transparency of water Use sea water as target/detector
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How? muon wavefron t 12345 ~few km ~100 m muon travels with speed of light (300,000 km/s) → ns – km neutrino interaction
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Antares prototype completed May 2008 22 M€
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position → time → 100 ms data filter 2 s offline reconstruction 1 Mb/s determination of muon direction 1 GB/s track optical background ~ 100 kHz ~5 neutrinos / day “All-data-to-shore” concept
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rate [Hz] cos neutrinos! Neutrinos? muon d( ) Earth
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2 May 2008 3:29
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30 March 2008 11:10
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Neutrino sky map 2° Limits on neutrino fluxes, world’s best for some specific sources. part of sky invisible to Antares PSF
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KM3NeT Next generation neutrino telescope 200 ‒ 250 M€
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Architecture light detection data transmission data filter filtered data neutrino detector shore station analysis operation start stop 100 km ≥ 2.5 km > 1000 km
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31 x 3” PMT concentrator ring increase of photocathode area by 20‒40% Optical module
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6 m Mechanical cable connection Data cable storage Mechanical cable storage Frame Optical module Mechanical holder Storey 1Digital Optical Module=Dom 2Dom’s on 1 bar=Dom-bar 20Dom-bar’s on 1 tower=Dom tower
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sudden Eddie currents Temperature Earth & Sea sciences France observatory food supply Bioluminescence short lived (rare) events dominate deep-sea life permanent observatory time profile
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KM3NeT deep-sea infrastructure 10 km 3 ‒> 400,000 PMTs, hydrophones, ACDP, seismometers, etc. ‒< 100 kW, 100 GB/s two main electro-optical cables ‒100 km, DC, 1 cupper conductor + sea return network ‒passive, point-to-point optical fiber with amplification ‒new Ethernet standard Precision-Time-Protocol (”White Rabbit”) operation ‒24h/day, 365 days/year ‒10 years without maintenance
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10kHzx400,000=4GHz 310kHzx13,000=4GHz 0.5kHzx1=500Hz neutrinos10 -3 Hz point source10 -7 Hz signal / noise
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data filter time Ethernet switch off-shore on shore CPU data flow
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data filter time Ethernet switch off-shore on shore CPU data flow
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data filter time Ethernet switch off-shore on shore CPU data flow
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Data issues operation of infrastructure – real-time computing computer farm (‘Tier 0’) – control data, QA/QC information, etc. database (Oracle) offline analysis – distributed data processing Grid/batch computing Monte Carlo simulations – photon tracking CPU intensive GPU (80 x faster than CPU) data analyses – ROOT histograms, n-tuples, trees, introspection, etc. high performance I/O
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Summary & outlook Neutrino astronomy is an emerging field at the intersection of particle physics and traditional astronomy ‒several neutrino detectors operational world wide, in Europe, Antares prototype completed in 2008 Deep-sea is actively explored for large research infrastructures – construction of KM3NeT is planned for the coming years – synergy between different sciences – interesting data challenges
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