Performances of silicone coated high resistive bakeliteRPC

Abstract: Performances of several single gap (gas gap 2mm) prototype Resistive Plate Chambers (RPC) made of high resistive () bakelite, commercially available in India have been studied in recent times. To make the inner electrode surfaces smooth, a thin coating of silicone has been applied. An efficiency and time resolution (FWHM) have been obtained for both the streamer and the avalanche mode. The induced charge distributions of those silicone coated RPC are studied and the results are presented. A numerical study on the effect of surface roughness of the resistive electrodes on the electric field of the device has been carried out using Garfield-neBEM code. A few results for a simplified model representing surface roughness, measured using a surface profilometer for the bakelite surfaces, have also been presented. [Copyright &y& Elsevier]