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Lake Baikal Neutrino Experiment Present and Future

Lake Baikal Neutrino Experiment Present and Future. G.V.Domogatsky (INR, Moscow) for the Baikal collaboration. The Baikal Collaboration. Institute for Nuclear Research, Moscow, Russia . Irkutsk State University, Irkutsk, Russia. Skobeltsyn Institute of Nuclear Physics MSU, Moscow, Russia.

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Lake Baikal Neutrino Experiment Present and Future

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  1. Lake Baikal Neutrino ExperimentPresent and Future G.V.Domogatsky (INR, Moscow) for the Baikal collaboration

  2. The Baikal Collaboration Institute for Nuclear Research, Moscow, Russia. Irkutsk State University, Irkutsk, Russia. Skobeltsyn Institute of Nuclear Physics MSU, Moscow, Russia. DESY-Zeuthen, Zeuthen, Germany. Joint Institute for Nuclear Research, Dubna, Russia. Nizhny Novgorod State Technical University, Nizhny Novgorod, Russia. 7. St.Petersburg State Marine University, St.Petersburg, Russia. 8. Kurchatov Institute, Moscow, Russia.

  3. Shore Station 4km OffShore Depth: 1366 m 1366m Depth

  4. Neutrino Telescope NT200+ (April, 2005)

  5. -8 strings: 72m height - 192 optical modules • pairwise coincidence  96 space points • calibration with N-lasers • timing ~ 1 nsec • Dyn. Range ~ 1000 pe Effective area: 1 TeV ~2000 m² Eff. shower volume: 10TeV ~0.2Mt Quasar PMT: d = 37cm Height x  = 70m x 40m, V=105m3 The NT-200 Telescope Installation 1993-1998 6

  6. NANP’03 Camp Ice as a natural deployment platform ~ 2 months

  7. GOALS • Natural flux of neutrinos with energy E>15GeV (search for point sources of neutrinos) • WIMP • Magnetic Monopoles • Diffuse flux of very high energy (E>10 TeV) neutrinos

  8. Neutrino events from low hemisphere April 1998 - February 2003 , 1038 d, 372events.

  9. Atmospheric Muon-Neutrinos E_thr ~ 15GeV Skyplot (galactic coordinates) - With looser cuts, 1998-2002: 372 events. Nm(>15GeV)/Nm(>1GeV)~1/7  A higher statistics neutrino sample for Point-Source Search. - MC: 385 ev. Expected (15%BG).

  10. Search for fast monopoles ( N= n2 (g/e)2 N= = 8300 N g = 137/2, n = 1.33 ~Em=107 GeV 90% C.L. upper limit on the flux of fast monopole (994 livedays) Event selection criteria: hit channel multiplicity - Nhi t> 35 ch, upward-going monopole - (zi-z)(ti-t)/(tz) > 0.45 & o Background - atmospheric muons

  11. NT-200 Look for upward moving light fronts. Signal: isolated cascades from neutrino interactions Background: Bremsshowers from h.e. downward muons Final rejection of background by „energy cut“ (Nchannel)  large effective volume Search for High Energy -Cascades (BG) 19

  12. Baikal Baikal Absorbtion Length: 22 ± 2 m Scattering Length ~ 30-50 m cos ~ 0.85-0.9 Optical properties

  13. Fiducial volume Position of cascade vertex AMANDA II Vg(NT-200) Neutrino Energy, lg(E/ТeV)

  14. UPPER LIMITS ON THE DIFFUSE NEUTRINO FLUX (theoretical and experimental) НТ-200+ км3

  15. NT200+ commissioned April 2005 1. 3 outer strings were installed 2. New DAQ – final modernization - 2 Underwater PC with Flex DSL modem (1 Mbod), Underwater Ethernet - Synchronization unit * time synchronization NT200 <-> outer strings * event clusterization 3. New Software DOS -> Linux, Remote control 4. New 2 cables to shore (2x4 km) 5. Calibration - New bright Laser

  16. 110100 1000PeV 41523 40Mton NT200+

  17. NT - 200+ Cascade coordinates (energy) reconstruction efficiency

  18. Time differences NT200 – outer string: 2-4nsec fwhm interstring/NT200 jitter >1012photons/pulse NT200+ time synchronization (new laser) mm

  19. NT200+ Start of operation April 2005 Examples of events

  20. NT200+ as a module of Gigaton (km3) Detector in Lake Baikal

  21. NT200+ as a module of Gigaton (km3) Detector in Lake Baikal

  22. Sparse instrumentation: 91 strings with 12 OM = 1308 OMs  effective volume for 100 TeV cascades ~ 0.5 -1.0 km³  muon threshold between 10 and 100 TeV A Gigaton (km3) Detector in Lake Baikal. 208m 624m 70m 70m 120m 280m

  23. Baikal – GVDSchedule Milestones • 06-07 R&D, Testing NT200+ • 08 Technical Design • 08-14 Fabrication (OMs, cables, connectors, electronics) • 10-12 Deployment (0.1 – 0.3) km3 • 13-14 Deployment (0.3 – 0.6) km3 • 15-16 Deployment (0.6 – 0.9) km3

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