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Journal of Applied Physics / Volume 107 / Issue 9 / ARTICLES / Plasmas and Electrical Discharges

J. Appl. Phys. 107, 093301 (2010); http://dx.doi.org/10.1063/1.3399650 (6 pages)

High power microwave generation from coaxial virtual cathode oscillator using graphite and velvet cathodes

Rakhee Menon, Amitava Roy, S. K. Singh, S. Mitra, Vishnu Sharma, Senthil Kumar, Archana Sharma, K. V. Nagesh, K. C. Mittal, and D. P. Chakravarthy

Accelerator and Pulse Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India

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(Received 16 February 2010; accepted 19 March 2010; published online 3 May 2010)

High power microwave (HPM) generation studies were carried out in KALI-5000 pulse power system. The intense relativistic electron beam was utilized to generate HPMs using a coaxial virtual cathode oscillator. The typical electron beam parameters were 350 kV, 25 kA, and 100 ns, with a few hundreds of ampere per centimeter square current density. Microwaves were generated with graphite and polymer velvet cathode at various diode voltage, current, and accelerating gaps. A horn antenna setup with diode detector and attenuators was used to measure the microwave power. It was observed that the microwave power increases with the diode voltage and current and reduces with the accelerating gap. It was found that both the peak power and width of the microwave pulse is larger for the velvet cathode compared to the graphite cathode. In a coaxial vircator, velvet cathode is superior to the graphite cathode due to its shorter turn on time and better electron beam uniformity.

© 2010 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. KALI-5000 PULSE POWER SYSTEM AND COAXIAL VIRTUAL CATHODE OSCILLATOR
  3. HPM GENERATION
    1. With a graphite cathode
    2. With a polymer velvet cathode
  4. SUMMARY AND CONCLUSIONS

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KEYWORDS and PACS

Keywords

cathodes, current density, graphite, microwave generation, polymers, relativistic electron beam tubes, vircators

PACS

  • 84.40.Fe

    Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3399650

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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