Cosmic Ray Test of INO RPC Stack

M. Bhuyan 1 , V.M. Datar 2 , S.D. Kalmani 1 , S.M. Lahamge 1 , N.K. Mondal 1 , P. Nagaraj 1 , S. Pal 1 , L.V. Reddy, A. Redij 1 , D. Samuel 1 , M.N. Saraf 1 , B. Satyanarayana 1 , R.R. Shinde 1 and P. Verma 1

India-based Neutrino Observatory (INO) Collaboration

1 Department of High Energy Physics, Tata Institute of Fundamental Research, Mumbai 400005, India 2 Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India

Plan of my talk

• • • • • • •

Introduction to INO RPC system.

Early results.

Construction of 1m X 1m RPCs.

Cosmic ray test stand and the DAQ system.

RPC performance studies using cosmic muons.

Monitoring long term stability of INO RPCs.

Future outlook and summary.

INO RPC system

No of modules INO Detector – Channel Count 3 Module dimension Detector dimension No of layers Iron plate thickness Gap for RPC trays Magnetic field RPC unit dimension Readout strip width No. of RPCs/Road/Layer No. of Roads/Layer/Module No. of RPC units/Layer Total no of RPC units No of Electronic channels 16 m X 16 m X 12 m 48 m X 16 m X 12 m 140 6 cm 2.5 cm 1.5 Tesla 2 m X 2 m 2 cm 8 8 192 27000 3.6 X 10 6

4

DAQ

Cosmic Muon Test using small RPCs

Gas unit Telescope Stack of 10 RPCs

Early results

RPC building blocks

7

Fabrication of 1m x 1m RPCs

8

INO 1m X 1m RPC Stack

9

Constructional details of the gas system 10

RPC Stack

VME BASED DAQ SETUP

X strip data Y strip data Analog Front End Timing info Digital Front End Event/ Monitor Data Trigger Module Event Trigger VME CRATE Scaler TDC Readout Module Linux based DAQ software (C++, Qt, ROOT)  Interrupt Based  Multi-Threaded  Graphical User Interface    Online 2D/3D Event Display RPC Strip Monitoring Online Error Reporting

Poster by Deepak Samual for more details about INO DAQ

Design and implementation of the data acquisition system

200 boards of 13 types Custom designed using FPGA,CPLD,HMC,FIFO,SMD 12

Some interesting cosmic ray tracks

13

Track Reconstruction

Zenith Angle distribution of cosmic ray tracks

c2

distribution of fitted tracks

Study of RPC performance using cosmic rays

Strip Multiplicity due to crossing muons Track residue in mm Image of a RPC using muons

RPC efficiency

RPC timing study

Poster by S. Pal for more details on timing studies

Particle direction using time information

Average layer-wise time plot for muon tracks in the RPC stack.

Velocity (

b )

distribution ( linear) Velocity (

b ) distribution (log)

Long term monitoring of RPC currents

Monitoring of strip counting rate

Summary

• • • •

We have successfully built and operated Glass RPCS in avalanche mode.

A stack of 12 such RPCs being used continuously to monitor their performances using cosmic muons.

Currents and noise rates are being monitored over long periods. No degradation after 2.5 years of operation.

The setup will be used for further studies and as a test stand to test new frontend electronics & DAQ.