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M Morales Sealed Rpcs

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  • 1. LabCAF Development on Sealed RPCs
      Miguel Morales, February 2010, Santiago de Compostela
  • 2. Motivation
      Trasgo is a convenient and flexible detector based on gas ionization detectors.
    One Trasgo chamber 2010
  • 3. Motivation
      Trasgo is a convenient and flexible detector based on gas ionization detectors.
    One Trasgo chamber Is there any chance to get rid of the gas system to win some flexibility? 2010
  • 4. Issues with the current gas system
    • Economic reasons . Gas systems and facilities cost money.
    • 5. Environmental unfriendly , R134a, SF6 are strong green house effect gases.
    • 6. Lack of portability . Gas systems have an important weight and volume.
    2010
  • 7. Sealed Resistive Plate Chambers (sRPCs)
      40 mm x 40 mm x 4 mm
    0.3 mm nylon gap Cu Electrodes Epoxy Glue Thermoplastic Float Glass Gas mixture
    • Some caveats:
      • Glass borders have to be polished
      • 8. Some time running a dry gas is needed to extract glass moisture.
    Fishing Line Electrodes Polyestirene Aluminium Foil Epoxy Glue Trasgo proposal Our first sRPC prototype
      800 mm x 200 mm x 10 mm
    2010
  • 9. sRPC Overview Signal Socket BNC HV Socket High Frequency Analog Amplifier PT100 Temperature Sensor Aluminum Box Sealed Chamber Two RC Circuits Standard gas mixture R134a/SF6/Isobutane 85/10/5 2010
  • 10. Setup 2.2 nF Current monitoring 10 K Ω 10 M Ω 2.2 nF 3 kV sRPC Low-pass RC filter (<3Hz) High-pass RC filter (>85Hz) High Frequency Analog Amplifier Analog to Digital Converter Power Supply Digital Scope TDS7104 CAEN N471A 2010 A ADC [Digital Scope]
  • 11. Our Chambers
    • We have made 10 sRPCs
    • 12. 4 of them have been tested, where:
      • 2 get ruined at the first day (almost no response to 0.5Mbq Na22 radioactive source)
      • 13. 2 were tested in a month time under radiation:
        • sRPC1 : Na22
        • 14. sRPC2 : Cosmic Rays
    2010
  • 15. Measurements on sRPC1
    • Current
    • 16. Integrated charge spectra
    • 17. High Voltage Plateau
    2010
  • 18. Current Trend sRPc1 Reference RPC PT100 2010
  • 19. Integrated Charge Spectrum One Day One Week Three weeks 2010
  • 20. High Voltage Plateau 2010
  • 21. What might degrade the chambers?
    • Gas ionization
    • 22. Gas leaks
    • 23. Gas concentration gradient
    • 24. Glue, thermoplastic or tubes gas emissions
    • 25. ???
      Gas density (1.013 bar and 15°C)
          • R134A: 4.25 kg/m3
          • 26. SF6: 6.27 kg/m3
          • 27. Isobutane: 2.51 kg/m3
    2010
  • 28. Summary
    • Several sealed RPCs has been build and tested.
    • 29. Signals mean charge and current increase with time.
    • 30. High voltage can be decreased to avoid streamers, but loosing gain.
    • 31. sRPCs working for short-time periods seem to be feasible.
    2010
  • 32. Future work
    • Measure sRPC resolution and efficiency, and they evolution.
    • 33. Use Estrela Front End Electronics and TRB acquisition system.
    • 34. Asses chamber isolation, and try better building ways.
    • 35. Asses gas aging, and try better gas mixtures for sRPCs.
    • 36. Scale things up.
    2010
  • 37. Many thanks to our Summer* students Nuria Teigel Diego Ramos * Summer, Autumn, Winter ... 2010