D. Senthil Kumar

Publications (2)1.75 Total impact

• Source

  Available from: ias.ac.in

  Article: 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
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  ABSTRACT: 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 ∼59.8 dBm (∼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.
  Pramana 04/2012; 74(1):123-133. · 0.57 Impact Factor
• Article: Pulsewidth Variation of an Axial Vircator

  A. Roy, S.K. Singh, R. Menon, D. Senthil Kumar, S. Khandekar, V.B. Somu, S. Chottray, P.C. Saroj, K.V. Nagesh, K.C. Mittal, D.P. Chakravarthy
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  ABSTRACT: The KALI-1000 pulse power system has been used to generate single-pulse nanosecond-duration high-power microwaves from an axial virtual cathode oscillator. The typical electron beam parameters were 250 kV, 15 kA, and 100 ns, with a current density of a few hundreds of amperes per square centimeter. The shot-to-shot variation of the microwave pulsewidth was studied for various anode-cathode gaps and two different cathode materials (velvet and graphite). Results indicated that the average microwave pulsewidth for a diode with a graphite cathode increased as the anode-cathode gap was increased. The one-way analysis of variance was employed to examine the statistical correlation between the diode voltage, current, perveance, and the microwave pulsewidth for various diode gaps and for two different cathode materials. It was shown that the microwave pulsewidth variations are not statistically correlated with the diode voltage, current, and perveance.
  IEEE Transactions on Plasma Science 08/2010; · 1.17 Impact Factor