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M Morales Sealed Rpcs

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M Morales Sealed Rpcs

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