ARNAB BANERJEE

Variable Energy Cyclotron Centre, India

VECC participation

a.Build ~10% of the MRPC modules (~12 + spares)

b.Will provide hardware for the entire low voltage system

c. Take part in data analysis, calibration, simulation

L ~ 10 km for down going ~12000 km for up going

E~ few MeV-100GeV Down near detectorno oscillationUp far detector Oscillation

Oscillation of atmospheric neutrinos

L’

L

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

N down(L’/E)

3

RPC/MRPC building experience at VECC

1. Facilities developed for RPC R&D for India-based Neutrino Observatory (INO):

INO Detector Iron Calorimeter (ICAL)

Mass: 50 kTonSize : 48 m (x) 16m (y) 12 m (z) 140 layers of 6 cm thick iron with 2.5 cm gap for active elements

Magnetic field ~ 1 Tesla along y-direction

4

Two 2 mm thick float BakeliteSeparated by 2 mm spacer

2 mm thick spacer

Resistive plates

Complete RPC Graphite coating on the outer surfaces of Resistive plates

Pickup strips

Resistive Plate Chamber for INO

5

Full facility for testing 12-RPCs simultaneously and forming tracks in mag. Field

8 Glass RPC + 4 Bakelite RPC

1 Tesla Uniform magnetic field

1m x 1m Bakelite RPC build at VECC

gas system

HV

LV

FEE

2. Double Gap Bakelite MRPC:

Bakelite: procured locally. Dimension: 30 cm X 20 cm

3. Four Gap Bakelite MRPC:

Dimension: 23 cm X 23 cm

10 mm

230 mm

Perspex base

Grooving for gas flow (4 mm X 2 mm)

230 mm

7

4. Six Gap Glass RPC: Dimension : 20 cm X 8 cm

Graphite paint is used as conductive material

9

Glass: procured from GSIGlass Thickness: 600 μmGas gap: 200 μm

cosmic-ray test setup

Gas distribution system (MFC based)

Gas: Ar, iso-butane, SF6 , Freon(R134a)

Can be adjusted for both streamer & avalanche mode

Schematic representation of cosmic ray setupSchematic representation of cosmic ray setup

Master trigger signal = SC1 .AND. SC2 .AND. SCF

Efficiency = (RPC count in coincidence with master trigger) (Master trigger count)

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Time resolution : START with Master trigger STOP with MRPC

6 7 8 9 100

20

40

60

80

100

High Voltage (kV)

Effi

cien

cy (

%)

7.5 8.0 8.5 9.00

2

4

6

8

average arrival time

FWHM

aver

age

arriv

al ti

me

(ns)

High Voltage (kV)

FW

HM

(ns

)

20

30

40

50

60

70

Efficiency > 90%Time resolution (FWHM) ~ 3 ns

1. 1m X 1m Bakelite RPC

2. Bakelite MRPC

Efficiency > 95%Time resolution(FWHM) ~ 2 ns

3. Glass MRPC

Efficiency > 90%Time resolution ~ 500 ps (σ)

Facility at VECC for LMRPC production for MTD:

• New Lab for LMRPC production

• Gas distribution system

• HV

• Cosmic setup

Requirements from the collaboration:

Read-out system ( electronics for high time resolution measurement)

Raw materials (glass, fishing line , scintillators, etc.)

Pick-up strips

Painting materials & procedure

Are they centrally available ???

Production Plan:

After having all the raw materials

Module Time

1 ~ 20 days

12 ~ 1 years

Fabrication :

Testing :

Module Time

12 ~ 1.5 years

After having all the Read-out system

If required we can do both the fabrication and test simultaneously

Analysis: Analysis is going on for : RUN10 : Cosmic RUN9 : p-p collision

plots indicates the positionof the MTD properly

Plots for RUN10 cosmic: