The CMS preshower silicon sensors: Technology development and production in India

A specific research and development program has been carried out in India by Bhabha Atomic Research Centre to develop the technology for 32-strip silicon sensors which will be used as Preshower sensors in the CMS experiment at the Large Hadron Collider (LHC), CERN. The technology development was targeted to produce sensors which would qualify for reliable operation in a high radiation environment of LHC. As an outcome of this R&D effort, silicon sensors with very good performance have been produced and the production of thousand sensors for the CMS Preshower has been completed. In this paper, we present a summary of the R&D carried out to develop the technology of the silicon sensors. We report on various aspects such as sensor design, process development and characterization. The results of various tests carried out for evaluating the performance of the sensors during technology development and production phase have been presented.