Performances of silicone coated high resistive bakelite RPC

TL;DR

This study evaluates the performance of silicone-coated high-resistivity bakelite RPCs, demonstrating high efficiency and good time resolution, and investigates surface roughness effects through numerical modeling.

Contribution

It presents the performance metrics of silicone-coated high-resistive bakelite RPCs and analyzes surface roughness effects using numerical simulations.

Findings

Efficiency > 90% achieved

Time resolution around 2 ns (FWHM)

Surface roughness impacts electric field distribution

Abstract

Performances of several single gap (gas gap 2 mm) prototype Resistive Plate Chambers (RPC) made of high resistive ({\rho} \sim 1010 - 1012 {\Omega} cm) 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 > 90% and time resolution \sim 2 ns (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.