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

1366m Depth

Neutrino Telescope NT200+ (April, 2005)

The NT-200 Telescope*Installation 1993-1998

CampIce as a natural deployment platform~ 2 monthsNANP03

GOALSNatural flux of neutrinos with energy E>15GeV (search for point sources of neutrinos)WIMPMagnetic MonopolesDiffuse flux of very high energy (E>10 TeV) neutrinos

April 1998 - February 2003 , 1038 d, 372 events.

Atmospheric Muon-Neutrinos - 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). Skyplot (galactic coordinates)E_thr ~ 15GeV

Event selection criteria:

hit channel multiplicity - Nhi t> 35 ch,upward-going monopole -(zi-z)(ti-t)/(tz) > 0.45 & o

Background - atmospheric muons

Search for High Energy -Cascades* (BG)

Optical properties

Fiducial volumeVg(NT-200)AMANDA II Position of cascade vertexNeutrino Energy, lg(E/eV)

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

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

NT200+

NT200+ time synchronization (new laser)mm

NT200+ Start of operation April 2005 Examples of events

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

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

A Gigaton (km3) Detector in Lake Baikal. 624m280m70m70m120m208m

Baikal GVDSchedule Milestones06-07 R&D, Testing NT200+08 Technical Design08-14 Fabrication (OMs, cables, connectors, electronics) 10-12 Deployment (0.1 0.3) km313-14 Deployment (0.3 0.6) km315-16 Deployment (0.6 0.9) km3