Gyromagnetron amplifier
First Claim
1. A method for efficiently amplifying radiation at millimeter wavelengths in a gyromagnetron waveguide tube comprising the steps of:
- choosing a waveguide tube with longitudinally running vanes in the walls of the tube, with the number of vanes in the tube chosen to coincide with the number of a desired cyclotron harmonic to be amplified, and wherein the dimensions for the tube cross-section are chosen so that the desired cyclotron harmonic frequency is approximately equal to the cut-off frequency of a fundamental mode of the waveguide tube;
generating a magnetic field within said waveguide tube in a direction approximately parallel to the axis of said waveguide tube with a value appropriate to the cyclotron harmonic frequency chosen for amplification;
generating and directing a beam of spiralling mildly relativistic electrons with an energy of 100 keV or less into said waveguide tube to propagate longitudinally therein and to interact with the fringe electric fields set up between the vanes; and
launching electromagnetic energy to be amplified into said waveguide tube to co-propagate with the spiralling electron beam.
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Accused Products
Abstract
A gyromagnetron amplifier for radiation at millimeter wavelengths comprising a tapered waveguide tube with longitudinally running vanes in the walls of the tube with the number of vanes chosen to coincide with a desired cyclotron harmonic frequency to be amplified. A beam of spiralling mildly relativistic electrons with an energy of 100 keV or less is directed into the small end of the tapered waveguide tube. A tapered axial magnetic field is set up within the waveguide tube with a low value appropriate to the amplification of a cyclotron harmonic frequency. An electromagnetic wave to be amplified is launched into the waveguide tube to co-propagate and be amplified by the spiralling electron beam. This device is characterized by a wide bandwidth, a low operating magnetic field, a relatively low operating beam voltage, with high power, and the capability of continuous wave operation.
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Citations
12 Claims
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1. A method for efficiently amplifying radiation at millimeter wavelengths in a gyromagnetron waveguide tube comprising the steps of:
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choosing a waveguide tube with longitudinally running vanes in the walls of the tube, with the number of vanes in the tube chosen to coincide with the number of a desired cyclotron harmonic to be amplified, and wherein the dimensions for the tube cross-section are chosen so that the desired cyclotron harmonic frequency is approximately equal to the cut-off frequency of a fundamental mode of the waveguide tube; generating a magnetic field within said waveguide tube in a direction approximately parallel to the axis of said waveguide tube with a value appropriate to the cyclotron harmonic frequency chosen for amplification; generating and directing a beam of spiralling mildly relativistic electrons with an energy of 100 keV or less into said waveguide tube to propagate longitudinally therein and to interact with the fringe electric fields set up between the vanes; and launching electromagnetic energy to be amplified into said waveguide tube to co-propagate with the spiralling electron beam. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A gyromagnetron amplifier comprising:
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a longitudinally tapered waveguide tube which is tapered from a first end to a second end;
said waveguide tube having longitudinally running vanes in the walls thereof, with the number of vanes coinciding with the number of the desired cyclotron harmonic to be efficiently amplified, and wherein the dimensions for the tube are chosen so that the desired cyclotron harmonic frequency is approximately equal to the cut-off frequency of a fundamental mode of the waveguide tube;means for generating a tapered magnetic field within said waveguide tube in a direction approximately parallel to the axis of said waveguide tube with a value appropriate to the cyclotron harmonic frequency chosen for amplification; means for generating and directing a beam of spiralling mildly relativistic electrons with an energy of 100 keV or less into the small first end of said waveguide tube to propagate longitudinally therein and to interact with the fringe electric fields set up between said vanes; and means for launching input electromagnetic energy into said waveguide tube to co-propagate with the spiralling electron beam to be efficiently amplified thereby. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification