India-Based Neutrino

Observatory(INO)

Naba K Mondal, TIFR, Mumbai

ICAL ( conceptu

al)INO Peak at

Bodi West Hills

Prototype ICAL at VECC

2mX2m RPC Test Stand at TIFR

ASIC for RPC designed at BARC

RPC Test stand at TIFR

ICAL: The physics goals

Accurate determination of the atmospheric parameters (q23 octant, deviation of q23 from maximality)

Determination of neutrino mass hierarchy (large q13 is good news !)

Nonstandard interactions, CPT violation, long range forces, ultrahigh energy muon fluxes, ...

Underground Laboratory Layout

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• The cavern-I is set under 1589 m peak with vertical rock cover of 1289 m.

• Accessible through a 1.9 km long tunnel

• Cavern -1 will host 50 kt ICAL detector. Space available for additional 50 kt.

• Cavern-2 & 3 available for other experiments ( NDBD, Dark Matter ….).

INO-ICAL Detector

Construction of the ICAL detector

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ICAL factsheetNo of modules 3

Module dimension 16 m X 16 m X 14.4m

Detector dimension 48.4 m X 16 m X 14.4m

No of layers 150

Iron plate thickness 5.6cm

Gap for RPC trays 4 cm

Magnetic field 1.4 Tesla

RPC unit dimension 195 cm x 184 cm x 2.4 cm

Readout strip width 3 cm

No. of RPCs/Road/Layer 8

No. of Roads/Layer/Module 8

No. of RPC units/Layer 192

Total no of RPC units 28800

No of Electronic channels 3.7 X 106

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Materials for gas volume fabrication

Edge

sp

acer

Gas

nozz

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ass

spac

er

Sche

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ass

embl

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as

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Development and characterisation of signal pickup panels

Open

100Ω 51Ω

48.2Ω

47Ω

Honeycomb panel

G-10 panel

Foam panel

Z0: Inject a pulse into the strip; tune the terminating resistance at the far end, until its reflection disappears.

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Fabrication of 1m x 1m RPCs

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Fully assembled large area RPC

1m 1m

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Prototype RPC Stack at TIFR tracking Muons

Charge spectrum

Time resolution

Analog signal due to muon

cosmic ray tracks in the RPC stand

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Demonstrate the Tracking Capability of the RPC system

RPC strip rate time profile

Temperature

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Making of 2m x 2m RPCs

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2m x 2m glass RPC test stand

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Steps towards Industrial production of RPCs

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RPC fabrication at Asahi Float Glass Co.

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Painting/curing of glass plates

Automatic RPC gap making

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Chamfering and engraving of glass

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RPC holding tray

Max. deflection4.4mm

Max. stress8.2MPa

Spec.5mm

FRP25MPa

Down side view

Fini

te E

lem

ent

Ana

lysi

s

Self weight + 100kg load

Extr

a th

ickn

ess

in s

elec

ted

sect

ions

Thre

e-lin

e su

ppor

t

Fabricated tray

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Functions & integration of FE-DAQ

Overall scheme of ICAL electronics

Major elements Front-end board RPCDAQ board Segment Trigger

Module Global Trigger Module Global Trigger Driver Tier1 Network Switch Tier2 Network Switch DAQ Server

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ICAL Front End Electronics ASIC development

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Front end 8 in one Apmlifier-discriminator ASIC developed by BARC

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ASIC based TDC device

Principle Two fine TDCs to measure start/stop distance

to clock edge (T1, T2) Coarse TDC to count the number of clocks

between start and stop (T3) TDC output = T3+T1-T2

Specifications Currently a single-hit TDC, can be adapted to

multi-hit 20 bit parallel output Clock period, Tc = 4ns Fine TDC interval, Tc/32 = 125ps Fine TDC output: 5 bits Coarse TDC interval: 215 * Tc = 131.072ms Coarse TDC output: 15 bits

The chip has arrived, evaluation tests are in progress it IITM

CMEMS is also coming up with an ASIC with similar specs.

Technology development for Industrial production of RPCs

Development of graphite coating by automatic spray painting.

Demonstration of successful operation of automatic button and glue dispenser.

Development of glass chamfering and glass Engraving.

Pickup panel development. Tray design. Computer modeling of RPC & its assembly in

ICAL. Physical RPC models to study push-pull

assembly in ICAL magnet gap.27

Current status INO-ICAL detector R&D work is progressing

very well. A prototype detector stack with all its associated electronics and data acquisition system is operational at TIFR. We are now in the process of involving local industry for their large scale production.

Various ASIC as well as FPGA based electronics modules/components for data acquisition from the ICAL detector are at various stages of development.

An engineering prototype detector will be constructed at Madurai in next one year.

Thank You for your

attention

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