Status summary of RPC R&D for INO ICAL detector

B.Satyanarayana, TIFR, MumbaiSatyajit Jena, IIT Bombay, PowaiFor INO Collaboration

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 2

Posters on display

1. The INO project

2. Development of Resistive Plate Chambers for the INO detector

3. Experiences of using float glass as electrodes for radiation detectors

4. On aging problem of glass Resistive Plate Chambers

5. Status of INO RPC R&D activities

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 3

INO detector concept

50 Kton magnetised ICAL

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 4

INO ICAL detector specifications

Number of modules 3

Module dimensions 16 m X 16 m X 12 m

Detector dimensions 48 m X 16 m X 12 m

Number of layers 140

Iron plate thickness ~6 cm

Gap for RPC trays 2.5 cm

Magnetic field 1.3 Tesla

RPC unit dimensions 2 m X 2 m

Readout strip width 3 cm

Number of RPCs/Road/Layer 8

Number of Roads/Layer/Module 8

Number of RPC units/Layer 192

Total number of RPC units 27000

Number of electronic channels 3.6 X 106

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 5

Current INO RPC R&D centers

TIFR, MumbaiSINP, KolkataVECC, KolkataBARC, MumbaiIITB Mumbai, Powai… University centers

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 6

Typical INO prototype RPC designs

1200X900 mm, 1000X1000 mm 400X300 mm, 300X300 mm

Pickup panel

Graphite coat

Gas

in/o

ut n

ozzl

es

2mm thick local float glass or Bakelite 2mm single gas gap using spacers or buttons Spacers, buttons, frames, gas nozzles made of poly carbonate

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 7

A couple of our very first results

Efficiency Timing

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 8

Aging of an RPC

00.0010.00

20.0030.0040.0050.00

60.0070.0080.00

90.00100.00

00:00 48:00 96:00 144:00 192:00 240:00 288:00

Run time, Hours

Eff

icie

ncy

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 9

Long term stability study RPCs

Two RPCs made of Japanese glass Readout by common pickup panel Operated in avalanche mode (R134a: 95.5%

and the rest Iso-Butane) at 9.3KV Round the clock monitoring of RPC and

ambient (T, RH and P) parameters In the system for more than 18 months Chamber currents, noise rate, combined

efficiencies etc are stable

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 10

Parameter monitor plots of RPCs

90

92

94

96

98

100

9/30/2005 0:00 10/20/2005 0:00 11/9/2005 0:00 11/29/2005 0:00 12/19/2005 0:00 1/8/2006 0:00 1/28/2006 0:00 2/17/2006 0:00 3/9/2006 0:00

Date time

0

5000

10000

15000

9/30/2005 0:00 10/20/2005 0:00 11/9/2005 0:00 11/29/2005 0:00 12/19/2005 0:00 1/8/2006 0:00 1/28/2006 0:00 2/17/2006 0:00 3/9/2006 0:00

Date time

No

ise

ra

te (

Hz

)

0

50

100

150

200

250

9/30/2005 0:00 10/20/2005 0:00 11/9/2005 0:00 11/29/2005 0:00 12/19/2005 0:00 1/8/2006 0:00 1/28/2006 0:00 2/17/2006 0:00 3/9/2006 0:00

Date time

Cu

rren

t

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 11

Tracking muons using RPC stack

Stack of 10 RPCs

Gas unit

Telescope

DAQ

• Streamer mode (R134a=62%, Argon=30% and the rest Iso-Butane)

• Recording hits, timing, noise rates etc

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 12

Some interesting events tracked

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 13

Scheme of INO prototype detector

12, 1m2 RPC layers 6cm thick magnetised iron plates About 1000 readout channels RPC and scintillation paddle triggers Hit and timing information

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 14

Readout scheme for prototype

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 15

Integration of electronics & DAQ

Front-end

Back-end

B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai 16

Summary

Successfully developed glass RPCs Work on Bakelite version in progress Studied aging problem in the RPCs Glass characterisation and selection Studied long term stability of RPCs RPC production for prototype detector Integration of electronics and DAQ Local development of materials and processes

Naba K. Mondal (INO Spokesperson)JIGSAW-2007February 19, 12:15 hours

India-based Neutrino Observatory (INO)