Radial electron-beam-breakup transit-time oscillator

Title: Radial electron-beam-breakup transit-time oscillator

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Abstract

A radial electron-beam-breakup transit-time oscillator (RBTO) provides a compact high power microwave generator. The RBTO includes a coaxial vacuum transmission line having an outer conductor and an inner conductor. The inner conductor defines an annular cavity with dimensions effective to support an electromagnetic field in a TEM.sub.00m mode. A radial field emission cathode is formed on the outer conductor for providing an electron beam directed toward the annular cavity electrode. Microwave energy is then extracted from the annular cavity electrode.

Inventors:

Kwan, Thomas J. T. ^[1]; Mostrom, Michael A. ^[2]

(Los Alamos, NM)
(Albuquerque, NM)

Issue Date:: 1998-01-01

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM

OSTI Identifier:: 871829

Patent Number(s):: 5805025

Assignee:: Regents of University of California (Los Alamos, NM) LANL

DOE Contract Number:: W-7405-ENG-36

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: radial; electron-beam-breakup; transit-time; oscillator; rbto; provides; compact; power; microwave; generator; coaxial; vacuum; transmission; line; outer; conductor; inner; defines; annular; cavity; dimensions; effective; support; electromagnetic; field; 00m; mode; emission; cathode; formed; providing; electron; beam; directed; electrode; energy; extracted; microwave generator; electromagnetic field; outer conductor; microwave energy; transmission line; magnetic field; electron beam; field emission; inner conductor; wave generator; wave energy; power microwave; emission cathode; radial electron-beam-breakup; coaxial vacuum; transit-time oscillator; electron-beam-breakup transit-time; /331/

Citation Formats


                    Kwan, Thomas J. T., and Mostrom, Michael A. Radial electron-beam-breakup transit-time oscillator.  United States: N. p., 1998. 
        Web.

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                    Kwan, Thomas J. T., & Mostrom, Michael A. Radial electron-beam-breakup transit-time oscillator.  United States.

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                    Kwan, Thomas J. T., and Mostrom, Michael A. Thu .  
        "Radial electron-beam-breakup transit-time oscillator".  United States.  https://www.osti.gov/servlets/purl/871829.

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@article{osti_871829,

  title        = {Radial electron-beam-breakup transit-time oscillator},

  author       = {Kwan, Thomas J. T. and Mostrom, Michael A.},

  abstractNote = {A radial electron-beam-breakup transit-time oscillator (RBTO) provides a compact high power microwave generator. The RBTO includes a coaxial vacuum transmission line having an outer conductor and an inner conductor. The inner conductor defines an annular cavity with dimensions effective to support an electromagnetic field in a TEM.sub.00m mode. A radial field emission cathode is formed on the outer conductor for providing an electron beam directed toward the annular cavity electrode. Microwave energy is then extracted from the annular cavity electrode.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1998},

  month        = {1}

}

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Similar records in DOE Patents and OSTI.GOV collections:

Radial electron-beam-breakup transit-time oscillator

Journal Article Mostrom, M.A. [Mission Research Corporation, Albuquerque, New Mexico 87106 (United States)]; Kwan, T.J.T. [Applied Theoretical Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)] - Physical Review Letters

A new radially driven electron-beam-breakup transit-time oscillator was investigated analytically and through computer simulation as a compact low-impedance high-power microwave generator. In a 1 MV, 50 kA device 35 cm in radius and 15 cm long, with no external magnetic field, 5 GW of extracted power and a growth rate of 0.26/ns were observed. Theoretical maximum efficiencies are several times higher.
DOI: 10.1103/PhysRevLett.75.1411
Radial electron-beam-breakup transit-time oscillator

Technical Report Mostrom, M.A. [Mission Research Corp., Albuquerque, NM (United States)]; Kwan, T.J.T. [Los Alamos National Lab., NM (United States)]

A new radially-driven electron-beam-breakup transit-time oscillator has been investigated analytically and through computer simulation as a compact low-impedance high-power microwave generator. In a 1MV, 50kA device 35cm in radius and 15cm long, with no external magnetic field, 5GW of extracted power and a growth rate of 0.26/ns have been observed. Theoretical maximum efficiencies are several times higher.
DOI: 10.2172/10116207

Full Text Available
Electron-beam-breakup transit-time oscillator

Journal Article Kwan, T.J.T. (Applied Theoretical Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (USA)); Mostrom, M.A.; Godfrey, B.B. (Mission Research Corporation, Albuquerque, New Mexico 87106 (USA)) - Physical Review Letters; (USA)

The electron-beam-breakup transit-time oscillator has been investigated via theoretical analysis and computer simulation as a high-power microwave generator. Coupling the beam-breakup instability with the transit-time effect of the electron beam in the cavity, rapid energy exchange between the electrons and cavity modes can occur. Furthermore, the transit-time resonance naturally leads to narrow-band output. Driven by a high-current electron beam, the beam-breakup transit-time oscillator can be a compact source for high-power ({gt}1 GW) operation. Good agreements have been obtained between linear theory and simulation.
DOI: 10.1103/PhysRevLett.66.3221
On some practical consideration of the electron beam breakup transit time oscillator

Conference Kwan, T.J.T.

The electron beam breakup transit time oscillator (BTO) makes use of the interaction between an electron beam and the azimuthally azimuthally asymmetric transverse magnetic mode (TM{sub 110}) of a cavity to facilitate the exchange of energy between them. Linear theory has shown a large growth rate in the regime where space-charge effects can be ignored. In this study, we have investigated the non-ideal elements in the BTO and evaluated their effects accordingly. The practical issues under consideration are electron beam quality, energy, and space-charge potential. Our calculations indicate only a modest unfavorable scalings with respect to these parameters.
On some practical consideration of the electron beam breakup transit time oscillator

Conference Kwan, T.J.T.

The electron beam breakup transit time oscillator (BTO) makes use of the interaction between an electron beam and the azimuthally azimuthally asymmetric transverse magnetic mode (TM{sub 110}) of a cavity to facilitate the exchange of energy between them. Linear theory has shown a large growth rate in the regime where space-charge effects can be ignored. In this study, we have investigated the non-ideal elements in the BTO and evaluated their effects accordingly. The practical issues under consideration are electron beam quality, energy, and space-charge potential. Our calculations indicate only a modest unfavorable scalings with respect to these parameters.

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