P Fonte Trasgo 2010

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P Fonte Trasgo 2010

  1. 1. Sealed RPCs: The LIP approach P.Fonte LIP- Coimbra
  2. 2. Objective: Develop a large area sealed RPC detector that may be used for cosmic ray experiments and Outreach activities. Inexpensive Modular (easy maintenance) TOF-quality timing 1st prototype built in August 2009 Learning process ongoing…
  3. 3. Mechanics 100.00 4 mm acrylic 5 2mm glass m 10.00 m 4 mm acrylic External (independent) readout electrodes K7 approach
  4. 4. 1st prototype 1m2 Under test since August
  5. 5. Performance so far (example) 600 1025 Pressure (mbar), Temperature (a.u.) 500 1020 400 Corrente (nA) 1015 300 Background current 1010 200 Counting current Temperature pressure 1005 100 0 1000 12-01-10 14-01-10 16-01-10 18-01-10 20-01-10 22-01-10 24-01-10 26-01-10 28-01-10 30-01-10 Chamber sealed Date The contamination is internal. We made VERY sure there is no macroscopic leakage. Best guess (my version): air trapped in adesives and/or under foils. If so, should go away after a few cleaning cycles. Obvious alternative: outgassing from materials.

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