Characterization with a nitrogen laser of a small size RPC

We present some results from the study of a small size RPC filled with a ternary gas mixture (94.3% C 2 H 2 F 4 , 5% C 4 H 10 , 0.3% SF 6 ), by measuring gas properties like the electrons drift velocity. A pulsed UV laser is focused inside the gas gap to induce ionization via double photon ionization processes. Results for drift velocity as a function of the applied electric field are presented and discussed.