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Status summary of RPC R&D for INO ICAL detector

Overview of resistive plate chambers (RPC) development for the INO detector, including use of float glass electrodes, aging issues, and R&D activities at various centers. Results on efficiency, timing, and long-term stability of RPCs presented.

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Status summary of RPC R&D for INO ICAL detector

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  1. Status summary of RPC R&D for INO ICAL detector B.Satyanarayana, TIFR, Mumbai Satyajit Jena, IIT Bombay, Powai For INO Collaboration

  2. Posters on display • The INO project • Development of Resistive Plate Chambers for the INO detector • Experiences of using float glass as electrodes for radiation detectors • On aging problem of glass Resistive Plate Chambers • 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 B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai

  5. Current INO RPC R&D centers • TIFR, Mumbai • SINP, Kolkata • VECC, Kolkata • BARC, Mumbai • IITB Mumbai, Powai • … University centers B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai

  6. Typical INO prototype RPC designs Pickup panel Graphite coat Gas in/out nozzles 1200X900 mm, 1000X1000 mm 400X300 mm, 300X300 mm • 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 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 B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai

  11. Tracking muons using RPC stack DAQ Gas unit Telescope • Streamer mode (R134a=62%, • Argon=30% and the rest Iso-Butane) • Recording hits, timing, noise rates etc Stack of 10 RPCs 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 Back-end Front-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 B.Satyanarayana, TIFR JIGSAW-2007, 12-23 February 2007, TIFR Mumbai

  17. India-based Neutrino Observatory (INO) Naba K. Mondal (INO Spokesperson) JIGSAW-2007 February 19, 12:15 hours

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