Photonic Crystal-Based High-Power Backward Wave Oscillator

Poole, Brian R.; Harris, John R.

doi:10.1109/TPS.2017.2774271

Title: Photonic Crystal-Based High-Power Backward Wave Oscillator

Full Record
Other Related Research

Abstract

An electron beam traversing a slow wave structure can be used to either generate or amplify electromagnetic radiation through the interaction of the slow space charge wave on the beam with the slow wave structure modes. Here, a cylindrical waveguide with a periodic array of conducting loops is used for the slow wave structure. This paper considers operation as a backward wave oscillator. The dispersion properties of the structure are determined using a frequency-domain eigenmode solver. The interaction of the electron beam with the structure modes is investigated using a 2-D particle-in-cell (PIC) code. In conclusion, the operating frequency and growth rate dependence on beam energy and beam current are investigated using the PIC code and compared with analytic and scaling estimates where possible.

Authors:

^[1];

^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Air Force Research Lab., Albuquerque, NM (United States)

Publication Date:: 2017-12-01

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1416512

Report Number(s):: LLNL-JRNL-730755
Journal ID: ISSN 0093-3813; TRN: US1800948

Grant/Contract Number:: AC52-07NA27344

Resource Type:: Accepted Manuscript

Journal Name:: IEEE Transactions on Plasma Science

Additional Journal Information:: Journal Volume: 46; Journal Issue: 1; Journal ID: ISSN 0093-3813

Publisher:: IEEE

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION; 42 ENGINEERING; Backward wave oscillators (BWOs); electron beams; periodic structures

Citation Formats


                    Poole, Brian R., and Harris, John R.. Photonic Crystal-Based High-Power Backward Wave Oscillator.  United States: N. p., 2017. 
Web.  doi:10.1109/TPS.2017.2774271.

Copy to clipboard


                    Poole, Brian R., & Harris, John R.. Photonic Crystal-Based High-Power Backward Wave Oscillator.  United States.  https://doi.org/10.1109/TPS.2017.2774271

Copy to clipboard


                    Poole, Brian R., and Harris, John R.. Fri .  
"Photonic Crystal-Based High-Power Backward Wave Oscillator".  United States.  https://doi.org/10.1109/TPS.2017.2774271.  https://www.osti.gov/servlets/purl/1416512.

Copy to clipboard


                    
@article{osti_1416512,

  title        = {Photonic Crystal-Based High-Power Backward Wave Oscillator},

  author       = {Poole, Brian R. and Harris, John R.},

  abstractNote = {An electron beam traversing a slow wave structure can be used to either generate or amplify electromagnetic radiation through the interaction of the slow space charge wave on the beam with the slow wave structure modes. Here, a cylindrical waveguide with a periodic array of conducting loops is used for the slow wave structure. This paper considers operation as a backward wave oscillator. The dispersion properties of the structure are determined using a frequency-domain eigenmode solver. The interaction of the electron beam with the structure modes is investigated using a 2-D particle-in-cell (PIC) code. In conclusion, the operating frequency and growth rate dependence on beam energy and beam current are investigated using the PIC code and compared with analytic and scaling estimates where possible.},

  doi          = {10.1109/TPS.2017.2774271},

  journal      = {IEEE Transactions on Plasma Science},

  number       = 1,

  volume       = 46,

  place        = {United States},

  year         = {2017},

  month        = {12}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1109/TPS.2017.2774271

Other availability

Search WorldCat to find libraries that may hold this journal

Citation Metrics:

Cited by: 2 works

Citation information provided by
Web of Science

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE PAGES and OSTI.GOV collections:

Investigation of a 140 GHz gryo-backward wave oscillator and a 95 GHz gyro-traveling wave

Thesis/Dissertation Basten, M A

There is current interest in developing a high-power source of continuously tunable millimeter wave radiation as a RF driver for high-power gyrotron, CARM, or FEL amplifiers. The gyrotron backward wave oscillator is a voltage-tunable fast-wave device that can satisfy these requirements. This thesis reports on the design and experimental investigation of a 130--145 GHz gyrotron backward wave oscillator Novel operating features of this design include the use of a 80-kV, 6.2-A Pierce-wiggler electron beam source, a broadband motheye window and an overmoded TE{sub 1,2} cylindrical interaction waveguide. Although this device has demonstrated voltage-tunable operation over the design range in themore »« less
Power and frequency measurements from a uniform backward wave oscillator as a function of length

Book Moreland, L D ; Roitman, A M ; Schamiloglu, E ; ...

The authors describe results from an experiment where the number of ripple periods in the slow wave structure of a backward wave oscillator (BWO) is increased. Both microwave power and frequency measurements are made for each shot. For a given cathode voltage and beam current, the microwave peak power and frequency are plotted as a function of BWO length. In previous investigations, the observation of two power maxima as a function of length was explained by the interaction of the electron beam with the forward traveling wave and reflections at the transition from the slow wave structure into the outputmore »« less
Numerical simulation of backward wave oscillators having nonuniform amplitude slow wave structures

Book Lemke, R W ; Moreland, L D ; Schamiloglu, E ; ...

Experiments involving backward wave oscillators having nonuniform amplitude slow wave structures (NBWOs) operating in the x-band frequency range have produced 500 MW of rf power with 20% efficiency. To elucidate the processes occurring in the NBWO, and to ascertain the possible advantage of using a nonuniform amplitude sow wave structure over one that is uniform, the authors have performed a simulation study involving several different tubes, nonuniform and uniform, using the 2.5D electromagnetic particle-in-cell code TWOQUICK. The simulations model experiments performed on the SINUS-6 electron beam accelerator at the University of New Mexico. Results of the simulation study are presented.more »« less
A high efficiency relativistic uniform backward wave oscillator

Conference Roitman, A M ; Moreland, L D ; Schamiloglu, E ; ...

A recent numerical calculation predicts efficiencies of 25--30% for uniform BWOs over a wider range of beam parameters than for nonuniform BWOs. This new model includes the interaction between the electron beam and the reflected forward traveling wave. For efficient BWO operation, it is important that the backward traveling wave and the reflected forward traveling wave are properly matched at the cutoff neck and the adiabatic transition into the output waveguide. A uniform BWO based on the principles described in the above model was investigated using the Sinus-6 relativistic electron beam accelerator. Cathode voltages from 400 kV to 650 kVmore »« less
Experimental investigation of a 140 GHz gyrotron-backward wave oscillator

Journal Article Basten, M A ; Guss, W C ; Kreischer, K E - International Journal of Infrared and Millimeter Waves

We report the experimental operation of a voltage tunable gyrotron backward wave oscillator (gyro-BWO) in the frequency range near 140 GHz. Voltage tunability is an important feature of the gyro-BWO for application as a fast tuning source for driving high power free electron lasers or cyclotron autoresonance maser amplifiers. The gyro-BWO operated in an overmoded cylindrical waveguide structure in the TE{sub 1,2} mode. The electron beam source was a Pierce-wiggler gun producing an 80 kV, 6.2 A beam. Frequency tuning with voltage between 134 and 147 GHz was achieved in the TE{sub 1,2} mode with constant magnetic field. However, thismore »« less
https://doi.org/10.1007/BF02066664

Similar Records