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Features of 200 kV, 300 ns reflex triode vircator operation for different explosive emission cathodes

Published online by Cambridge University Press:  27 November 2012

Amitava Roy ,
R. Menon ,
Vishnu Sharma ,
Ankur Patel ,
Archana Sharma  and
D.P. Chakravarthy
Amitava Roy*
Affiliation:
Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
R. Menon
Affiliation:
Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
Vishnu Sharma
Affiliation:
Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
Ankur Patel
Affiliation:
Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
Archana Sharma
Affiliation:
Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
D.P. Chakravarthy
Affiliation:
Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
*
Address correspondence and reprint requests to: Amitava Roy, Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India. E-mail: [email protected]
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Abstract

To study the effect of explosive field emission cathodes on high power microwave generation, experiments were conducted on a reflex triode virtual cathode oscillator. Experimental results with cathodes made of graphite, stainless steel nails, and carbon fiber (needle type) are presented. The experiments have been performed at the 1 kJ Marx generator (200 kV, 300 ns, and 9 kA). The experimentally obtained electron beam diode perveance has been compared with the one-dimensional Child-Langmuir law. The cathode plasma expansion velocity has been calculated from the perveance data. It was found that the carbon fiber cathode has the lowest cathode plasma expansion velocity of 1.7 cm/μs. The radiated high power microwave has maximum field strength and pulse duration for the graphite cathode. It was found that the reflex triode virtual cathode oscillator radiates a single microwave frequency with the multiple needle cathodes for a shorter (<200 ns full width at half maximum) voltage pulse duration.

Keywords

Explosive field emissionPlasma expansionReflex triodeSpace-charge limited emission
Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 1 , March 2013 , pp. 45 - 54
Copyright
Copyright © Cambridge University Press 2012

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