Test and Analysis of Operation Voltage and Time Resolution of Resistive Plate Chamber

The signals from the resistive plate chamber (RPC) were tested under different operation voltages. According to the amplitude and shape of the signals, the operation voltages for avalanche signals and streamer signals were determined respectively. The influence of the operation gas mixture and high voltage on the time resolution was also investigated. The time resolution first decreases with the increase of voltage and then goes up again. There is a minimum value of time resolution. The minimum of time resolution shifts forward for 200 V with the increase of the ratio of SF6. At voltage 10.2 kV and φ(SF6)=1.3%, the time resolution reaches its optimized value.