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Performances of silicone coated high resistive bakelite RPC

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arxiv 1206.5627 v1 pith:PGJE3GE2 submitted 2012-06-25 physics.ins-det

Performances of silicone coated high resistive bakelite RPC

S. Biswas , Purba Bhattacharya , S. Bhattacharya , S. Bose , S. Chattopadhyay , N. Majumdar , S. Mukhopadhyay , S. Saha
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Y. P. Viyogi
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classification physics.ins-det
keywords beenresistivebakelitesiliconesurfacecoatedhighperformances
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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.

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