• M D Ghodgaonkar

      Articles written in Pramana – Journal of Physics

    • Instrumentation for PSD-based neutron diffractometers at Dhruva reactor

      S S Pande S P Borkar S Prafulla V D Srivastava A Behare P K Mukhopadhyay M D Ghodgaonkar S K Kataria

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      Linear position sensitive detectors (PSDs) are widely used to configure neutron diffractometers and other instruments. Necessary front-end electronics and a data acquisition system [1] is developed to cater to such instruments built around the Dhruva research reactor in BARC. These include three diffractometers with multiple PSDs and four with single PSD. The front-end electronics consists of high voltage units, preamplifiers [2],shaping amplifiers, ratio ADCs (RDC) [3]. The data acquisition system consists of an interface card and software. Commercially available hardware like temperature controller or stepper motor controller connected over GPIB or RS232 are also integrated in the data acquisition system. The data acquisition is automated so that it can continue unattended for control parameter like temperature, thus enabling optimum utilization of available beam time. The instrumentation is scalable and can be easily configured for various instrumental requirements. The front-end electronics and the data acquisition system are described here.

    • Silicon detector technology development in India for the participation in international experiments

      Anita Topkar S Praveenkumar Bharti Aggarwal S K Kataria M D Ghodgaonkar

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      A specific research and development program has been carried out by BARC in India to develop the technology for large area silicon strip detectors for application in nuclear and high energy physics experiments. These strip detectors will be used as pre-shower detector in the CMS experiment at LHC, CERN for $\pi^{0}/\lambda$ rejection. The fabrication technology to produce silicon strip detectors with very good uniformity over a large area of $\sim 40$ cm2, low leakage currents of the order of 10 nA/cm2 per strip and high breakdown voltage of $>500$ V has been developed by BARC. The production of detectors is already under way to deliver 1000 detector modules for the CMS and 90% production is completed. In this paper, research and development work carried out to develop the detector fabrication technology is briefly described. The performance of the silicon strip detectors produced in India is presented. The present status of the detector technology is discussed.

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