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

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Presentation on theme: "Lake Baikal Neutrino Experiment Present and Future G.V.Domogatsky (INR, Moscow) for the Baikal collaboration."— Presentation transcript:

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

2 1.Institute for Nuclear Research, Moscow, Russia. 2.Irkutsk State University, Irkutsk, Russia. 3.Skobeltsyn Institute of Nuclear Physics MSU, Moscow, Russia. 4.DESY-Zeuthen, Zeuthen, Germany. 5.Joint Institute for Nuclear Research, Dubna, Russia. 6.Nizhny Novgorod State Technical University, Nizhny Novgorod, Russia. 7. St.Petersburg State Marine University, St.Petersburg, Russia. 8. Kurchatov Institute, Moscow, Russia. The Baikal Collaboration

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

5 Neutrino Telescope NT200+ (April, 2005)

6 6 The NT-200 Telescope -8 strings: 72m height 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=10 5 m 3 Installation

7 Camp Ice as a natural deployment platform ~ 2 months

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

16 Neutrino events from low hemisphere April February 2003, 1038 d, 372 events.

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

18 Search for fast monopoles (  N   = n 2 (g/e) 2 N   = = 8300 N   g = 137/2, n = 1.33 ~E  =10 7 GeV Event selection criteria: hit channel multiplicity - N hi t > 35 ch, upward-going monopole -  (z i -z)(t i -t)/(  t  z ) > 0.45 &  o Background - atmospheric muons 90% C.L. upper limit on the flux of fast monopole (994 livedays)

19 19 Search for High Energy - Cascades NT-200 large effective volume 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“ (N channel )  (BG)

20 Baikal Absorbtion Length: 22 ± 2 m Scattering Length ~ m  cos  ~ Optical properties

21 Fiducial volume V g (NT-200) AMANDA II Position of cascade vertex Neutrino Energy, lg(E/ТeV)

22 UPPER LIMITS ON THE DIFFUSE NEUTRINO FLUX (theoretical and experimental) НТ-200+ км 3

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

24 PeV Mton NT200+

25 Cascade coordinates (energy) reconstruction efficiency NT

26 NT200+ time synchronization (new laser) mm Time differences NT200 – outer string: 2-4nsec fwhm interstring/NT200 jitter >10 12 photons/pulse

27 NT200+ Start of operation April 2005 Examples of events

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

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

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33 Baikal – GVD Schedule Milestones R&D, Testing NT R&D, Testing NT Technical Design 08 Technical Design Fabrication (OMs, cables, Fabrication (OMs, cables, connectors, electronics) connectors, electronics) Deployment (0.1 – 0.3) km Deployment (0.1 – 0.3) km Deployment (0.3 – 0.6) km Deployment (0.3 – 0.6) km Deployment (0.6 – 0.9) km Deployment (0.6 – 0.9) km3 Overall cost with logistics ~ 20 MEuro Detector ~ 16 MEuro Logistics, including infrastructure ~ 4 MEuro

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