• K V Nagesh

      Articles written in Pramana – Journal of Physics

    • 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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