lake baikal neutrino experiment present and future g.v.domogatsky (inr, moscow) for the baikal...

Lake Baikal Neutrino Experiment

Present and FutureG.V.Domogatsky (INR, Moscow)

for the Baikal collaboration

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

4km OffShore

Depth: 1366 m

Shore Station

1366m Depth

Neutrino Telescope NT200+ (April, 2005)

6

The NT-200 Telescope-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 = 37cmHeight x = 70m x 40m, V=105m3

Installation 1993-1998

CampIce as a natural deployment platform

~ 2 months

NANP’03NANP’03

GOALSGOALS

Natural flux of neutrinos with energy Natural flux of neutrinos with energy E> E>1515GeVGeV ( (search for point sources search for point sources of neutrinosof neutrinos))

WIMPWIMP Magnetic MonopolesMagnetic Monopoles Diffuse flux of very high energy Diffuse flux of very high energy

(E>10 TeV) neutrinos(E>10 TeV) neutrinos

Neutrino events from low hemisphere

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

Atmospheric Muon-Neutrinos

- With looser cuts, 1998-2002: 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 ~ 15GeVE_thr ~ 15GeV

Search for fast monopoles (

N= n2 (g/e)2 N = = 8300 N g = 137/2, n = 1.33 ~E=107 GeV

Event selection criteria:

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

Background - atmospheric muons

90% C.L. upper limit on the flux of fast monopole (994 livedays)

19

Search for High Energy -CascadesNT-200

large effective volume

Look for upward moving light fronts.

Signal: isolated cascades from neutrino interactions

Background:Bremsshowers fromh.e. downward muons

Final rejection of backgroundby „energy cut“ (Nchannel)

(BG)

Baikal

Baikal

Absorbtion Length: 22 ± 2 m Scattering Length ~ 30-50 m cos ~ 0.85-0.9

Optical properties

Fiducial volume

Vg(NT-200)

AMANDA II

Position of cascade vertex

Neutrino Energy, lg(E/ТeV)

UPPER LIMITS ON THE DIFFUSE NEUTRINO FLUX

(theoretical and experimental)

НТ-200+

км3

NT200+ commissioned April 2005 1. 3 outer strings were 1. 3 outer strings were

installedinstalled

2. New DAQ – final 2. New DAQ – final modernization modernization

-- 2 Underwater PC with Flex 2 Underwater PC with Flex DSL modem (1 Mbod),DSL modem (1 Mbod),

Underwater Ethernet Underwater Ethernet -- Synchronization unit Synchronization unit ** time synchronization time synchronization NT200 <-> outer NT200 <-> outer

stringsstrings ** event clusterization event clusterization

3. New Software 3. New Software DOS DOS --> Linux, Remote > Linux, Remote

controlcontrol

4. New 2 cables to shore (2x4 4. New 2 cables to shore (2x4 km)km)

5. Calibration - New bright 5. Calibration - New bright LaserLaser

1 10 100 1000 PeV

4 15 23 40 Mton

NT200+

Cascade coordinates (energy) reconstruction efficiency

NT - 200+

NT200+ time synchronization (new laser)

mm

Time differences NT200 – outer

string:2-4nsec fwhm

interstring/NT200 jitter>10>101212 photons/pulsephotons/pulse

8

1

2 4

7

3

3 +

2 +1 +

Ru n #42 (com _ev #1270)NT-200 22 сhanNT+ 7 chan

6

5

8

15

2 4

6 7

3

3 +

2 +1 +

Ru n #3(com _ev #1395)NT-200 9 сhanNT+ 6 chan

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.

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

624m

280m

70m

70m

120m

208m

Baikal – GVDBaikal – GVDSchedule MilestonesSchedule Milestones

06-07 R&D, Testing NT200+06-07 R&D, Testing NT200+ 08 Technical Design08 Technical Design 08-14 Fabrication (OMs, cables, 08-14 Fabrication (OMs, cables,

connectors, electronics) connectors, electronics)

10-12 Deployment (0.1 – 0.3) km310-12 Deployment (0.1 – 0.3) km3 13-14 Deployment (0.3 – 0.6) km313-14 Deployment (0.3 – 0.6) km3 15-16 Deployment (0.6 – 0.9) km315-16 Deployment (0.6 – 0.9) km3

Overall cost with logistics ~ 20 MEuro Detector ~ 16 MEuro Logistics, including infrastructure ~ 4

MEuro