Evolution of spectral power density in grounded cathode relativistic magnetron

I. Schnitzer, A. Rosenberg, C. Leibovitz, I. Cohen, M. Botton, J. Leopold

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations


A novel, rep-rated, relativistic magnetron design is demonstrated. Unlike other relativistic magnetrons, the high voltage pulse is positively charged, feeding the anode block, while the cathode is grounded. Moreover, the anode-cathode interaction space is centered in a larger buffer cavity that serves as an electric insulator and electromagnetic impedance matching between the anode block and the exit waveguide(s). The grounded cathode geometry eliminates the axial current (improving efficiency) and enables the use of compact, CW, U-shaped electromagnet. It may also be utilized for frequency tunability through the buffer cavity in a way similar to coaxial magnetrons. Operation with peak power of 50MW (100MW) and pulse length of 150ns (70ns) has been achieved. Employing metal-dielectric cathodes led to repetitive operation up to 10Hz. The analysis emphasizes time-resolved spectral power density of both in-cavity and emitted microwaves in regard to the undesirable occurrence of pulse shortening.

Original languageAmerican English
Pages (from-to)101-109
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 28 Oct 1996
Externally publishedYes
EventIntense Microwave Pulses IV 1996 - Denver, United States
Duration: 4 Aug 19969 Aug 1996

Bibliographical note

Publisher Copyright:
© 1996 SPIE. All rights reserved.


  • High-power microwaves
  • Magnetron cavity design
  • Metal-dielectric cathode
  • Pulse shortening
  • Relativistic magnetron
  • Time-frequency distribution


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