Research: Current Projects  -  Recent Publications and Talks  -  Sponsors

Rotating wave resonators (circular polarization)

  • Continuous, spiraling interactions
  • Extended interaction regions
  • Use of single, long resonators

Spiraling beam is accelerated by rotating fields.

Rotating microwave Ez field of the TM-310 mode.

Field emission arrays (FEAs)

  • Eliminates need for cathode heater
  • Lower power consumption
  • Lower cooling requirements
  • Very compact
  • Built-in gate

Microphoto of Emitting tips

Test Chamber

Micro photo of two emitting tips

Experimental chamber to test FEA's

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Current Projects

Harmonic Amplifier (HARA)
 We are developing a harmonic amplifier which also acts as a frequency multiplier. This amplifier will be lightweight, compact, and will not require a focusing magnetic field. Once developed, it should efficiently provide coherent high-power microwave radiation suitable for airborne and mobile applications, as well as other commercial applications where size, weight and efficiency are critical.

  • A compact high-frequency rotating wave frequency multiplier.
  • Sends a spiraling electron beam through a harmonic output cavity to amplify and frequency multiply signals.
  • 5.8 GHz input, 35 GHz output, 150 kW output, 20 db gain, 60% efficiency.
     
    Output Cavity Setup for HARA

    HARA's output cavity and vacuum chamber.

    Experimental set-up for the HARA.

Rotating wave accelerator (RWA)
The rotating-wave accelerator is a compact radio frequency (rf) electron beam accelerator which employs a single short rf cavity to accelerate a low-energy electron beam to energies that range from 1 to 10 Mega electron volts.

  • An industrial accelerator for production of electrons and x-rays in the 1 to 6 MeV range.
  • Very compact: 6" diameter by 8" long including focusing magnets.

    Accelerator focusing magnets

    Magnetic field profile

    Accelerator focusing magnets.

    Magnetic field profile.

    RWA cavity

    Cut away of accelerator

    RWA cavity.

    Cut away of accelerator.

    Dielectric Traveling Wave Tube

    Commercial device.
    Proposed device.
    Simulation showing electron densities.


    Simulation showing rf fields.

     

    Miniature Cold Cathode Electron Gun

    The miniature cold-cathode electron gun will be able to provide high-quality, high current density electron beams for applications such as the next generation of microwave tubes. It may also be used in electron microscopes, high definition television, spectrometers and flat panel displays.

    single emitting tip
    I-V characteristics of device field emitting array containing 15000 tips
      

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Recent Publications and Talks
 
  1. Jose E. Velazco and Peter H. Ceperley, Development of a Compact Rotating-Wave Electron Accelerator, Proceeding of the 17th International Conference on the Application of Accelerators in Research and Industry CAARI 2002, PB9, Pg. 49, November 12-16, 2002, University of North Texas, Denton, Texas.
     
  2. Jose E. Velazco and Peter H. Ceperley, Compact Cold-Cathode Electron Buncher for Medical and Industrial Accelerators, Proceeding of the 17th International Conference on the Application of Accelerators in Research and Industry CAARI 2002, BH7, Pg. 15, November 12-16, 2002,University of North Texas, Denton, Texas.
     
  3. Jose E. Velazco and Peter H. Ceperley, Status Of A High-Frequency Harmonic Amplifier's Development, IEEE Proceedings of the 2002 International Conference on Plasma Science, 1B06, 97, May 26-30, Banff, Alberta, Canada.
     
  4. Jose E. Velazco and Peter H. Ceperley, Compact Cold-Cathode Electron Buncher, IEEE Proceedings of the 2002 International Conference on Plasma Science, 2P19, 151, May 26-30, Banff, Alberta, Canada.
     
  5. Jose E. Velazco and Peter H. Ceperley, Development of a C-band Harmonic Amplifier, IEEE Proceedings of the 2002 International Conference on Plasma Science, 3P14, 186,May 26-30, Banff, Alberta, Canada.
     
  6. Jose E. Velazco, Douglas M. Menz and Peter H. Ceperley, Compact High-Frequency Electron Buncher Development for Accelerator Applications, Bull. Am. Phys. Soc. 46, 27, April 28- May 1, 2001, Washington, D.C.
     
  7. Peter H. Ceperley, Jose E. Velazco and Douglas M. Menz, Development of a 35 GHz Sixth-Harmonic Amplifier, Bull. Am. Phys. Soc. 46, 27, April 28- May 1, 2001, Washington, D.C.
     
  8. Jose E. Velazco, Peter H. Ceperley and Douglas M. Menz, 35 GHz Sixth-Harmonic Amplifier Experiment, Bull. Am. Phys. Soc. 45, YP1 49, October 23-27, 2000, Quebec City, Quebec, Canada.
     
  9. Douglas M. Menz, Jose E. Velazco and Peter H. Ceperley, Miniature Cold-Cathode Electron Gun, Bull. Am. Phys. Soc. 45, YP1 50, October 23-27, 2000, Quebec City, Quebec, Canada.
     
  10. Peter H. Ceperley, Jose E. Velazco and Douglas M. Menz, Compact Rotating-Wave Accelerator for Medical and Industrial Applications, Bull. Am. Phys. Soc. 51, YP1 49, October 23-27, 2000, Quebec City, Quebec, Canada.
     

 

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Sponsors


  • US Air Force
  • US Army
  • US National Institutes of Health
  • Virginia's Center for Innovative Technology (CIT)
  • Science Applications International Corporation (SAIC)
  • Missile Defense Agency (MDA)
  • National Science Foundation (NSF)

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