• Amitava Roy

      Articles written in Pramana – Journal of Physics

    • RF properties of 700 MHz, $\beta = 0.42$ elliptical cavity for high current proton acceleration

      Amitava Roy J Mondal K C Mittal

      More Details Abstract Fulltext PDF

      BARC is developing a technology for the accelerator-driven subcritical system (ADSS) that will be mainly utilized for the transmutation of nuclear waste and enrichment of U233. Design and development of superconducting medium velocity cavity has been taken up as a part of the accelerator-driven subcritical system project. We have studied RF properties of 700 MHz, $\beta = 0.42$ single cell elliptical cavity for possible use in high current proton acceleration. The cavity shape optimization studies have been done using SUPERFISH code. A calculation has been done to find out the velocity range over which this cavity can accelerate protons efficiently and to select the number of cells/cavity. The cavity's peak electric and magnetic fields, power dissipation $P_{c}$, quality factor 𝑄 and effective shunt impedance $ZT^{2}$ were calculated for various cavity dimensions using these codes. Based on these analyses a list of design parameters for the inner cell of the cavity has been suggested for possible use in high current proton accelerator.

    • Measurement of high-power microwave pulse under intense electromagnetic noise

      Amitava Roy S K Singh R Menon D Senthil Kumar R Venkateswaran M R Kulkarni P C Saroj K V Nagesh K C Mittal D P Chakravarthy

      More Details Abstract Fulltext PDF

      KALI-1000 pulse power system has been used to generate single pulse nanosecond duration high-power microwaves (HPM) from a virtual cathode oscillator (VIRCATOR) device. HPM power measurements were carried out using a transmitting–receiving system in the presence of intense high frequency (a few MHz) electromagnetic noise. Initially, the diode detector output signal could not be recorded due to the high noise level persisting in the ambiance. It was found that the HPM pulse can be successfully detected using wide band antenna, RF cable and diode detector set-up in the presence of significant electromagnetic noise. Estimated microwave peak power was $\sim 59.8$ dBm ($\sim 1$ kW) at 7 m distance from the VIRCATOR window. Peak amplitude of the HPM signal varies on shot-to-shot basis. Duration of the HPM pulse (FWHM) also varies from 52 ns to 94 ns for different shots.

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