Speaker
Description
RPCs operated in streamer mode are still a detector of potential interest in neutrino and astro-particle physics applications (like OPERA and ARGO experiments). Such experiments are typically characterized by large area apparatuses with no stringent requirements on detector aging and rate capabilities. More than 40 gas mixtures obtained by combining 10 different gases have been tested using cosmic rays and digitizing the RPC signals at 5 GSamples/s. Mixtures containing "ecologic" HFO-1234ze and HFO-1234yf isomers have been also tested in order to optimize their concentration. The introduction of HFO-1234ze is helpful also because removing the flamable iso-butane from the mixture, safety requirements are much simplified. The results of the tests will be presented both in terms of detectors properties (efficiency, multiple-streamer probability and time resolution) and in terms of streamer characteristics.
