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Kwo R Chu

age ~80

from Hacienda Heights, CA

Also known as:
  • Kwo Chu
  • Ray Chu Kwo

Kwo Chu Phones & Addresses

  • Hacienda Heights, CA
  • Walnut, CA
  • Annandale, VA
  • Hacienda Hts, CA

Us Patents

  • Wide-Band Gyrotron Traveling-Wave Amplifier

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  • US Patent:
    45338752, Aug 6, 1985
  • Filed:
    Jun 16, 1982
  • Appl. No.:
    6/389133
  • Inventors:
    Yue-Ying Lau - Silver Spring MD
    Kwo R. Chu - Annandale VA
    Victor L. Granatstein - Silver Spring MD
    Larry R. Barnett - Manassas VA
  • International Classification:
    H01S 100
    H01J 2308
  • US Classification:
    330 4
  • Abstract:
    A high power amplifier for amplifying millimeter-wave radiation comprising: a length of metallic waveguide tapered from a small cross-sectional end to a larger cross-sectional end; a magnetron-type electron injection gun for injecting a spiral beam of relativistic electrons at the small end of the waveguide for propagation axially therein so that the wall radius of the tapered waveguide increases in the downstream direction of the electron beam; an input coupler for launching electromagnetic waves to be amplified into the waveguide at the large waveguide end thereof such that the individual frequencies in the input waves are reflected at various points along the constriction of the waveguide taper so that they copropagate with and are amplified by the electron beam; and a magnetic circuit for generating an axial magnetic field within the tapered waveguide with a unique profile approximately in accordance with the following equation to maintain synchronism: ##EQU1## where the z subscript is the waveguide axial direction, the. perp. subscript designates the direction perpendicular to this axial direction, and the o subscript represents those quantities at the entrance point for the electron beam into the waveguide. This device has been found experimentally to have negligible launching loss and low sensitivity to electron velocity spread.
  • Wide-Band Distributed Rf Coupler

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  • US Patent:
    45674019, Jan 28, 1986
  • Filed:
    Jun 12, 1982
  • Appl. No.:
    6/389132
  • Inventors:
    Larry R. Barnett - Manassas VA
    Yue-Ying Lau - Silver Spring MD
    Kwo R. Chu - Annandale VA
    Victor L. Granatstein - Silver Spring MD
  • Assignee:
    The United States of America as represented by the Secretary of the Navy - Washington DC
  • International Classification:
    H01J 2538
    H01J 2534
  • US Classification:
    315 5
  • Abstract:
    A wide-band distributed coupler for coupling rf energy from an input waveguide into a tapered interaction waveguide in a traveling-wave amplifier comprising a plurality of channel filters connecting between the input and interaction waveguides, with each filter coupled to the interaction waveguide at the appropriate cross-sectional position along its tapered length where the interaction waveguide cutoff frequency approximately matches the wave frequency propagated by the filter. Each filter comprises, in one embodiment, a main coaxial cavity tuned to a distinct center frequency, a first simple isolation cavity for coupling rf energy between the input waveguide and the main cavity, and at least one second simple isolation cavity for coupling energy between the main cavity and the tapered interaction waveguide. This coupler is compatible both in bandwidth and geometry with the tapered interaction waveguide.
  • Slow-Wave Wideband Cyclotron Amplifier

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  • US Patent:
    43629687, Dec 7, 1982
  • Filed:
    Jun 24, 1980
  • Appl. No.:
    6/162702
  • Inventors:
    Kwo R. Chu - Annandale VA
    Phillip A. Sprangle - Silver Spring MD
    Victor L. Granatstein - Silver Spring MD
  • Assignee:
    The United States of America as represented by the Secretary of the Navy - Washington DC
  • International Classification:
    H01J 2534
  • US Classification:
    315 35
  • Abstract:
    A slow-wave, cyclotron-type, travelling-wave-tube amplifier in which the m-wave interaction is the result of a Weibel-type instability. The travelling wave is slowed down in its propagation through the waveguide by a dielectric liner located on the inner wall of the waveguide. The bunching mechanism is the result of the V. sub. perp. . times. B. sub. perp. Lorentz force.
  • Solid-State Cyclotron Maser

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  • US Patent:
    43769179, Mar 15, 1983
  • Filed:
    Jun 25, 1980
  • Appl. No.:
    6/163003
  • Inventors:
    Achintya K. Ganguly - Alexandria VA
    Kenneth L. Davis - Alexandria VA
    Kwo R. Chu - Annandale VA
  • Assignee:
    The United States of America as represented by the Secretary of the Navy - Washington DC
  • International Classification:
    H01S 102
  • US Classification:
    331 941
  • Abstract:
    A solid-state cyclotron maser for generating low power (1 watt or less) signals in the submillimeter frequency range (300 GHz-30,000 GHz) includes an accelerating region, a drift region, and a metal grid therebetween. Both regions are formed from semiconductor material, such as indium antimonide, having non-parabolic energy bands. The drift region is a thin disc having metallized outer surfaces, but includes an annular opening in the metal on the front side and a circular opening in the metal on the back side, and is grounded. A grid of metal rings is placed on the annular opening of the drift region. The accelerating region is a hollow cylinder having a metallized front surface. It couples to the drift region for covering the annular opening and the grid. A negative bias voltage is applied to the accelerating region and a magnetic field is applied to the maser at an angle to the axis of the maser. Electrons propagate in spiral trajectories through the accelerating region, grid and drift region.
  • Gyrotron Travelling-Wave Amplifier

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  • US Patent:
    42245761, Sep 23, 1980
  • Filed:
    Sep 19, 1978
  • Appl. No.:
    5/943894
  • Inventors:
    Victor L. Granatstein - Silver Spring MD
    Phillip Sprangle - Silver Spring MD
    Adam T. Drobot - Annandale VA
    Kwo R. Chu - Annandale VA
    J. Laurence Safter - Alexandria VA
  • Assignee:
    The United States of America as represented by the Secretary of the Navy - Washington DC
  • International Classification:
    H01S 100
    H01J 2316
  • US Classification:
    330 4
  • Abstract:
    An apparatus for amplifying coherent radiation at millimeter and submillimeter wavelengths includes the combination of a travelling-wave-tube cyclotron-maser-amplifier structure and a magnetron-injection electron gun. The amplifier structure includes a fast-wave drift tube and an electromagnetic wave launcher within the bore of a superconducting magnet. The magnetron-injection electron gun is also within the bore of the magnet and is coupled to the drift tube. As a travelling wave is launched in a preferred mode in the drift tube, the electron gun injects an annular beam of relativistic electrons having both large energy transverse to the axis of the device and small energy spread into the drift tube so that the electrons gyrate at their cyclotron frequency in orbits about the lines of the axial magnetic field produced by the magnet. The travelling wave is amplified by extracting energy from the relativistic electron beam. Efficiency of this energy transfer is optimized by tapering the magnetic field near the output end of the wave-beam interaction region.
  • Complex Cavity Gyrotron

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  • US Patent:
    45544840, Nov 19, 1985
  • Filed:
    Aug 29, 1983
  • Appl. No.:
    6/527626
  • Inventors:
    Michael E. Read - Oakton VA
    Yuval Carmel - Haifa,
    Kwo R. Chu - Annandale VA
    Achintya K. Ganguly - Alexandria VA
  • Assignee:
    The United States of America as represented by the Secretary of the Navy - Washington DC
  • International Classification:
    H01J 2500
  • US Classification:
    315 4
  • Abstract:
    A complex cavity gyrotron designed for stable operation at high order modes. The device comprises circuitry for generating an annular electron beam, a coupled cavity disposed coaxially with the electron beam and having a first and second adjacent coaxial sections with the dimensions of these coaxial sections adjusted so that different modes with the same azimuthal eigen number but different radial eigen numbers are simultaneously resonant at approximately the same frequency in the two sections, and circuitry for generating an axial magnetic field within the cavity. Few, if any, combinations of modes other than the combination chosen will simultaneously resonate in the cavity thereby effecting higher order mode suppression. The present design has a low susceptibility to beam velocity spread and is effective for any combination of modes with identical azimuthal eigen numbers.
  • High Efficiency Gyrotron Oscillator And Amplifier

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  • US Patent:
    43706215, Jan 25, 1983
  • Filed:
    Mar 11, 1980
  • Appl. No.:
    6/129294
  • Inventors:
    Phillip A. Sprangle - Silver Spring MD
    Robert A. Smith - Washington DC
    Kwo R. Chu - Annandale VA
  • Assignee:
    The United States of America as represented by the Secretary of the Navy - Washington DC
  • International Classification:
    H01S 400
  • US Classification:
    330 4
  • Abstract:
    An electron cyclotron maser high-frequency generator/amplifier having a cavity resonator positioned in an axial magnetic field. A spiralling beam of relativistic electrons is injected into the cavity and stimulated emission of radiation by the electrons takes place at the frequency of a wave mode supported by the cavity resonator. The transverse efficiency, defined as the average electron energy loss divided by its initial transverse energy, is maximized by disposing a shaped iron collar about the cavity resonator to provide an axial magnetic field in the cavity resonator whose amplitude increases in the beam direction-of-travel. In an alternative embodiment, the transverse efficiency is maximized by tapering the inner wall of the cavity in the axial direction to provide a wave-mode in the cavity resonator whose electric-field amplitude increases in the beam direction-of-travel.

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