Microwave Power Measurements on the Recirculating Planar Magnetron

ORAL

Abstract

The recirculating planar magnetron (RPM)\footnote{R.M. Gilgenbach, et. al., IEEE Trans. Plasma Sci., V39, p980-987 (2011)} is a high power microwave generator that recirculates the beam in two-coupled, planar magnetrons. Experiments on the first L-band prototype\footnote{M.A. Franzi, et. al., IEEE Trans. Plasma Sci., V41, p639-645 (2013)} have successfully produced 50-200 $\mu$s, 30-130 MW microwave pulses with instantaneous electronic efficiencies of up to 30{\%} at approximately 1 GHz. The device is driven using MELBA-C, with parameters of: -300 kV for 0.3-1.0 $\mu$s, and 0.15-0.3 T axial magnetic fields. Recent RPM experiments have explored the effect of cathode surface treatment on the extracted microwave power, efficiency, and pulse width. This work utilized a proof of principle extraction system with antennas on the center vane of each oscillator to couple RF power into two, coaxial transmission lines. An advanced design, the Coaxial All Cavity Extractor, is in fabrication and will be discussed.

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Authors

  • N.M. Jordan

    The University of Michigan, Nuclear Eng. \& Rad. Sciences Dept., Univ of Michigan, Ann Arbor, Nuclear Eng. \& Rad. Sciences Department, University of Michigan, The University of Michigan, Ann Arbor, MI 48109

  • M. Franzi

    Nuclear Eng. \& Rad. Sciences Dept., Univ of Michigan, Ann Arbor, Nuclear Eng. \& Rad. Sciences Department, University of Michigan

  • Geoff Greening

    Nuclear Eng. \& Rad. Sciences Dept., Univ of Michigan, Ann Arbor, Nuclear Eng. \& Rad. Sciences Department, University of Michigan, University of Michigan, Ann Arbor

  • Ronald Gilgenbach

    The University of Michigan, Nuclear Eng. \& Rad. Sciences Dept., Univ of Michigan, Ann Arbor, Nuclear Eng. \& Rad. Sciences Department, University of Michigan, Univ of Michigan - Ann Arbor, The University of Michigan, Ann Arbor, MI 48109, University of Michigan, Ann Arbor

  • David Simon

    Nuclear Eng. \& Rad. Sciences Dept., Univ of Michigan, Ann Arbor, Nuclear Eng. \& Rad. Sciences Department, University of Michigan, University of Michigan, Ann Arbor

  • Y.Y. Lau

    Nuclear Eng. \& Rad. Sciences Dept., Univ of Michigan, Ann Arbor, Nuclear Eng. \& Rad. Sciences Department, University of Michigan, Univ of Michigan - Ann Arbor, University of Michigan, Ann Arbor

  • Brad Hoff

    AFRL, Air Force Reseach Laboratory

  • J.W. Luginsland

    AFOSR