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Development of Glass Resistive Plate Chambers for INO

Development of Glass Resistive Plate Chambers for INO. Satyanarayana Bheesette Tata Institute of Fundamental Research, INDIA For India-Based Neutrino Observatory Collaboration. INO Iron Calorimeter detector concept. 50 Kton magnetised ICAL. 2m × 2m RPC detector. ICAL detector fact sheet.

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Development of Glass Resistive Plate Chambers for INO

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  1. Development of Glass Resistive Plate Chambers for INO Satyanarayana BheesetteTata Institute of Fundamental Research, INDIAFor India-Based Neutrino Observatory Collaboration

  2. INO Iron Calorimeter detector concept 50 Kton magnetised ICAL 2m × 2m RPC detector Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  3. ICAL detector fact sheet Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  4. Highlights of earlier work LCWS06 RPC2007 1ft  1ft RPC2005 Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  5. Development of RPC materials and procedures • Electrode glass and its characterisation • Electrode coating & resistance measurement techniques • Frames, spacers, buttons, gas nozzles etc. • Adhesives, cleaning agents etc. • Pneumatic jig development for chamber assembly • Gases, gas mixing systems and gas proportions • Gas leak and assembly testing of RPCs • High Voltage insulating Mylar sheets • Spark free high voltage contacts • High voltage holding tests etc. • Pickup panel designs and characterisation • Chamber mounting assemblies • Chamber characterisation test stands • Electronics and data acquisition and monitoring systems • Quality control parameters and procedures Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  6. RPC spacers, buttons and nozzles Conceptual design of the RPC Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  7. Multi-channel gas mixing system • Four input gases • 16 pneumatically controlled outputs • Molecular sieve based input filter columns • Nippon Tylan made model FC-760 MFCs • Parker made fine filters on the mixed gas • On-line moister readout on mixed gas • Output flow control by SS 0.3mm capillaries • Bleeder bubblers for RPC protection • Facility to add controlled moister into the mixture • Computer interface for control and monitoring Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  8. RPCs for prototype detector • Using 3mm thick Asahi Float glass procured from local market • Polycarbonate buttons, spacers and gas nozzles developed and fabricated • Resistive coat developed in collaboration with a local industry • Operated in avalanche mode using R134:Iso:SF6::95.5:4.3:0.2 gas mixture 1m  1m Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  9. Charge-pulse height plot Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  10. Pulse height-pulse width plot Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  11. Charge spectrum of the RPC  = 375fC Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  12. Time spectrum of the RPC t = 1.7nS Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  13. ICAL prototype detector • 13 layers of 50 mm thick low carbon iron plates • 35 ton absorber mass, rectangular design • 1.5 Tesla uniform magnetic field • 12, 1m2 RPC layers • About 768 readout channels • Trigger on cosmic ray muons • In situ, using RPCs • Using scintillation paddle layers • Record strip hit and timing information • Chamber and ambient parameter monitoring Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  14. Magnet iron installation Steel sample size: 68cm  43.5 cm  4.8 cm 4 sets of copper coils of 5 turns each Channels for water cooling B-H curve of the magnet Assembled magnet Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  15. Electronics scheme for prototype detector Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  16. RPC stack for INO prototype detector Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  17. RPC timing resolution plots Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  18. Strip noise rate history plots Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

  19. Current status and future work • Successfully developed, fabricated and characterised 1m2 RPCs. Preparing to start making 4m2 RPCs. • Magnet for prototype detector assembled and tested up to B of 0.65 T at 2000 amp turns • Dozen chambers under long term test in a detector stack, tracking cosmic ray muons • Design and fabrication of electronics and data acquisition systems completed; commissioning in final stages • Expecting to start taking data in coming months Satyanarayana Bheesette, TIFR, INDIA ICHEP08, University of Pennsylvania, USA 31st July 2008

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