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Cosmic Ray Test of INO RPC Stack

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

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Cosmic Ray Test of INO RPC Stack

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  1. Cosmic Ray Test of INO RPC Stack M. Bhuyan1, V.M. Datar2, S.D. Kalmani1, S.M. Lahamge1, N.K. Mondal1, P. Nagaraj1, S. Pal1, L.V. Reddy, A. Redij1, D. Samuel1, M.N. Saraf1, B. Satyanarayana1, R.R. Shinde1 and P. Verma1 India-based Neutrino Observatory (INO) Collaboration 1Department of High Energy Physics, Tata Institute of Fundamental Research, Mumbai 400005, India 2Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India

  2. 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.

  3. INO RPC system

  4. INO Detector – Channel Count

  5. Cosmic Muon Test using small RPCs DAQ Gas unit Telescope Stack of 10 RPCs 5

  6. Early results 6

  7. RPC building blocks

  8. Fabrication of 1m x 1m RPCs

  9. INO 1m X 1m RPC Stack

  10. Constructional details of the gas system Internal view Front view Rear view 10

  11. VME BASED DAQ SETUP X strip data Analog Front End Digital Front End Trigger Module Y strip data RPC Stack Timing info Event Trigger Event/ Monitor Data VME CRATE Readout Module TDC Scaler 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

  12. Design and implementation of the data acquisition system 200 boards of 13 types Custom designed using FPGA,CPLD,HMC,FIFO,SMD

  13. Some interesting cosmic ray tracks

  14. Track Reconstruction Zenith Angle distribution of cosmic ray tracks c2 distribution of fitted tracks

  15. Study of RPC performance using cosmic rays Strip Multiplicity due to crossing muons Track residue in mm Image of a RPC using muons

  16. RPC efficiency

  17. RPC timing study Poster by S. Pal for more details on timing studies

  18. 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)

  19. Long term monitoring of RPC currents

  20. Monitoring of strip counting rate

  21. 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.

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