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Antares /KM3NeT

Antares /KM3NeT. M. de Jong. Neutrino astronomy. p. n. g. neutrinos. Why neutrinos: no absorption no bending ‘remote microscope’. Scientific motivation: origin cosmic rays birth & composition relativistic jets mechanism of cosmic particle acceleration dark matter.

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Antares /KM3NeT

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  1. Antares/KM3NeT M. de Jong

  2. Neutrino astronomy p n g neutrinos • Why neutrinos: • no absorption • no bending • ‘remote microscope’ • Scientific motivation: • origin cosmic rays • birth & composition relativistic jets • mechanism of cosmic particle acceleration • dark matter 10,000 sparser than Super-K neutrino telescope

  3. Antares Operation and physics analyses

  4. Detector operation complete direction information zenith angle only online neutrino count main cable repair twelve lines operational! date detector construction completed

  5. Neutrino detection upward going muons good quality events neutrinos neutrinos number of events data Monte Carlo total Monte Carlo neutrino Monte Carlo muon L cos q • Antares: angular resolution 0.5±0.1 degrees

  6. Neutrino sky map (2007‒2008) part of sky invisible to Antares PSF 2° Limits on neutrino fluxes, world’s best for some specific sources.

  7. Nikhef analyses in Antares • Point source search, A. Heijboeret al. • 1st point source search to be published soon • Antares‒Auger correlation, J. Petrovicet al. • approved unblinding of data (December 2010) • GRB:muon neutrino, M. Bouwhuiset al. • approved unblinding of data (January 2011) • GRB:electron neutrino, C. Reed & E. Presani • approved unblinding of part of data (January2011) • Nikhef is leading analysis efforts

  8. KM3NeT convergence on the design¶ ¶ unanimous decision of the institute board, d.d. 25 January 2011

  9. Optical module 31 x 3” PMT ETeL, Hamamatsu, ... concentrator ring increase of photocathode area by 20‒40%

  10. Storey Frame Mechanical cable storage Data cable storage Mechanical cable connection 6 m Optical module Mechanical holder 1 Digital Optical Module = Dom 2 Dom’s on 1 bar = Dom-bar 20 Dom-bar’s on 1 tower = Dom tower Needs new deployment technique

  11. NIOZ operations • 1st deployment test SeaWiet line December 2010 • new set of deployment tests last & this week • deployment & unfurling successful, but some problems with detachment of launcher • data from 2 autonomous lines with 3” PMTs will become available next week after 1 year of operation

  12. Atmospheric muonrates L0 L1 1 L2 Rate [kHz] 10-1 10-2 5 15 20 25 30 35 40 10 number of Lx • 70% of L0s contribute to L1s

  13. Effective area standard Antareslabs bar 0 m A [m2] SeaWiet ratio PeV TeV En [GeV]

  14. Angular resolution E-2 muon standard Antareslabs bar 0 m probability SeaWiet E-2 neutrino probability angle [degrees]

  15. Sensitivity E2F [GeVcm-2s-1] ratio sin(d)

  16. Event reconstruction 4D-PDF 2D-PSF 2p f p R = 10 m R = 20 m R = 30 m R = 40 m R = 50 m 0 -1 0 +1 Dt [ns] cosq • Sky map of event PDFs

  17. comparison with IceCube KM3NeT IceCube 5s discovery E2F [GeV-1cm-2s-1] 3s limit Galactic centre sind

  18. Nikhef contributions to KM3NeT • Technical design • multi-PMT optical module • data acquisition system design • “All-data-to-shore” has become a standard • fibre-optics network & transceivers • online data filter • HV PMT-base, vertical electro/fibre-optics cable, power system, ... • deployment procedures (NIOZ) • Science • Monte Carlo simulation tools • Event reconstruction & physics analyses • Nikhef is a main contributor

  19. Summary & outlook • Antares • taking data routinely (24h/day) • superior angular resolution compared to ice • new MoU in preparation (5 years) • KM3NeT • established technical convergence • cost estimates remain stable (200‒250 M€) • new ways in event reconstruction explored • deployment prototype model before end 2011

  20. personal remarks • site issue • top-down • requires one of the host countries to cover 50% (?) of cost • natural way • takes time for some of us to come to terms with the outcome • multi-site • may be steered by funding prospects • technical design • established convergence provides necessary focus • simulations & prototyping efforts are now made in a coherent way • [re-]evaluation by early 2012 • science • strong case for neutrino astronomy beyond IceCube (and Antares) • world-wide collaboration between IceCube, Antares and KM3NeT • “Beyond deep core” IceCube workshop, Amsterdam 26‒27 March

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