5. Environmental unfriendly , R134a, SF6 are strong green house effect gases.

6. Lack of portability . Gas systems have an important weight and volume. 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]

14. sRPC2 : Cosmic Rays 2010

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

22. Gas leaks

23. Gas concentration gradient

24. Glue, thermoplastic or tubes gas emissions

26. SF6: 6.27 kg/m3

27. Isobutane: 2.51 kg/m3 2010

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

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