india-based neutrino observatory (ino) status report naba k mondal tata institute of fundamental...

INDIA-BASED NEUTRINO OBSERVATORY (INO)

STATUS REPORT

Naba K Mondal Tata Institute of Fundamental Research

Mumbai, India

NUFACT Scoping Study Meeting at CERN, 22-24 September, 2005

NUFACT Scoping Study meeting at CERN, 22-24 Sep, 2005

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India-based Neutrino Observatory initiative

• Two phase approach:

R & D and ConstructionPhase I

Physics studies,Detector R & D,Site survey,Human resource development

Phase IIConstruction of the detector

Operation of the Detector

Phase IPhysics with Atmospheric Neutrinos

Phase IIPhysics with Neutrino beam from

a factory

Goal: A large mass detector with charge identification capability


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Physics using atmospheric neutrinos during Phase I

• Reconfirm atmospheric neutrino oscillation• Improved measurement of oscillation parameters• Search for potential matter effect in neutrino oscillation

• Determining the sign of m223 using matter effect

• Discrimination between and s oscillation

• Probing CP and CPT violation• Constraining long range leptonic forces• Ultra high energy neutrinos and muons


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Physics with Neutrino beam from NUFACT – Phase II

• Determination of

• Sign of m223

• Probing CP violation in leptonic sector

• Matter effect in oscillation


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Role of Phase I as a test detector for the factory era

• Currently we only have experience of running magnetised iron detector of upto 5 kton. No experience of running a large mass magnetised detector.

• So during phase I of the operation of the INO detector while we do interesting physics using atmospheric neutrinos, it can also be used as a test detector for the factory era and to improve upon it .

• The modular nature of this detector can even allow us to try out more than one options for the active elements like RPC, scintillators …

• While we have a supporting funding agency in India we need international support and collaboration to achieve this.


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Disappearance of Vs. L/E

The disappearance probability can be measured with a single detector and two equal sources:

= P( ; L/E) N up(L/E)

N down(L’/E)= 1 - sin2 (2) sin2 (1.27 m2 L/E)


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Matter Effect & Sign of from event rate

+

-


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Sign of m32 from matter induced asymmetry

The neutrino and anti-neutrino up/down event ratios are different from each other as well as different with direct and inverted mass hierarchies.

= 5,7,9,11


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vs s

events will give rise to excess of muon less events. There will be excess of upgoing muonless events.


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Choice of Neutrino Source and Detector• Neutrino Source

– Need to cover a large L/E range

• Large L range

• Large E Range

– Use Atmospheric neutrinos as source

• Detector Choice• Should have large target mass ( 50-100 kT)

• Good tracking and Energy resolution ( tracking calorimeter)

• Good directionality ( <= 1 nsec time resolution )

• Charge identification

• Ease of construction

• Modularity

• Complimentarity with other existing and proposed detectors

– Use magnetised iron as target mass and RPC as active detector medium


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INO Detector Concept


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The Magnet


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RPC Efficiencies and Timing

RPC working in Streamer mode


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RPC R & D

120 cm X 90 cm Glass RPCBuilt at TIFR

CMS RPC on test stand

CMS bakelite RPC73 cm X 42.5 cm


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Detector Simulation• Used NUANCE Neutrino Event Generator

– Generate atmospheric neutrino events inside INO detector

• Used Atmospheric Neutrino Flux of Honda et. al.

• GEANT detector simulation package– Simulate the detector response for the neutrino event

• Generated 5 years of simulated data equivalent to 5 years of running the experiment.

• Analysed oscillation data at two levels– Using NUANCE output and kinematic resolution function– Using full detector simulation

• Obtained preliminary results so far. Detailed simulation is underway.


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LOCATION OF INO

• PUSHEP (Pykara Ultimate Stage Hydro Electric Project) in South India


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PUSHEP


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Underground Cavern

Layout of the Underground Cavern

Size of the experimental hall150 m X 22 m X 30 m

Access tunnel

Experimental Hall

Parking & Storage

Electronics

Experimental Hall


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Status of the Proposal

• Some R & D fund was made available.• Several institutes from India are currently involved in

various INO related activities.• Underground Site has been chosen.• A presentation to the funding authorities was made on 1st

May 2005.• A second presentation was made on 28th of August, 2005 to

the Scientific Advisory Committee to the Indian Prime Minister (SAC-PM). Response of the committee is very positive.

• We are in touch with the global neutrino community for support and participation.


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Summary• A large magnetised detector of 50-100 kton is needed to achieve

some of the very exciting physics goals using atmospheric neutrinos.

• A case for such a detector was highlighted earlier by the Monolith Collaboration.

• Physics case for such a detector is strong as evident from recent publications.

• It will complement the existing and planned water cherenkov detectors.

• Can be used as a far detector during neutrino factory era.

• We have started a very active R & D work towards building such a detector.

• Apart from the physics using atmospheric neutrinos, this detector can act as the R & D center for a magnetised iron detector during factory era.

india-based neutrino observatory (ino) status report naba k mondal tata institute of fundamental...

Documents

detector operation

test detector

large mass detector

single detector

neutrino beam

large mass magnetised

detector r d

choice of neutrino source