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Title: Virtual cathode microwave generator having annular anode slit

Abstract

A microwave generator is provided for generating microwaves substantially from virtual cathode oscillation. Electrons are emitted from a cathode and accelerated to an anode which is spaced apart from the cathode. The anode has an annular slit therethrough effective to form the virtual cathode. The anode is at least one range thickness relative to electrons reflecting from the virtual cathode. A magnet is provided to produce an optimum magnetic field having the field strength effective to form an annular beam from the emitted electrons in substantial alignment with the annular anode slit. The magnetic field, however, does permit the reflected electrons to axially diverge from the annular beam. The reflected electrons are absorbed by the anode in returning to the real cathode, such that substantially no reflexing electrons occur. The resulting microwaves are produced with a single dominant mode and are substantially monochromatic relative to conventional virtual cathode microwave generators.

Inventors:
 [1];  [1]
  1. (Los Alamos, NM)
Issue Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM
OSTI Identifier:
866525
Patent Number(s):
4730170
Assignee:
United States of America as represented by Department of Energy (Washington, DC) LANL
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
virtual; cathode; microwave; generator; annular; anode; slit; provided; generating; microwaves; substantially; oscillation; electrons; emitted; accelerated; spaced; apart; therethrough; effective; form; range; thickness; relative; reflecting; magnet; produce; optimum; magnetic; field; strength; beam; substantial; alignment; permit; reflected; axially; diverge; absorbed; returning; reflexing; occur; resulting; produced; single; dominant; mode; monochromatic; conventional; generators; microwave generator; magnetic field; spaced apart; field strength; wave generator; virtual cathode; annular anode; substantially monochromatic; emitted electrons; optimum magnetic; /331/315/

Citation Formats

Kwan, Thomas J. T., and Snell, Charles M. Virtual cathode microwave generator having annular anode slit. United States: N. p., 1988. Web.
Kwan, Thomas J. T., & Snell, Charles M. Virtual cathode microwave generator having annular anode slit. United States.
Kwan, Thomas J. T., and Snell, Charles M. Fri . "Virtual cathode microwave generator having annular anode slit". United States. https://www.osti.gov/servlets/purl/866525.
@article{osti_866525,
title = {Virtual cathode microwave generator having annular anode slit},
author = {Kwan, Thomas J. T. and Snell, Charles M.},
abstractNote = {A microwave generator is provided for generating microwaves substantially from virtual cathode oscillation. Electrons are emitted from a cathode and accelerated to an anode which is spaced apart from the cathode. The anode has an annular slit therethrough effective to form the virtual cathode. The anode is at least one range thickness relative to electrons reflecting from the virtual cathode. A magnet is provided to produce an optimum magnetic field having the field strength effective to form an annular beam from the emitted electrons in substantial alignment with the annular anode slit. The magnetic field, however, does permit the reflected electrons to axially diverge from the annular beam. The reflected electrons are absorbed by the anode in returning to the real cathode, such that substantially no reflexing electrons occur. The resulting microwaves are produced with a single dominant mode and are substantially monochromatic relative to conventional virtual cathode microwave generators.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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