Rapid kinematic bunching and parametric instability in a crossed-field gap with a periodic magnetic field

Single particle orbit considerations show that the cycloidal orbits of electrons in a gap with crossed electric and magnetic fields lead to rapid spoke formation if the external magnetic field has a periodic variation. This spoke formation is primarily a result of kinematic bunching, which is indepe...

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Bibliographic Details
Published in:IEEE transactions on plasma science Vol. 33; no. 2; pp. 654 - 660
Main Authors: Neculaes, V.B., Pengvanich, P., Hidaka, Y., Lau, Y.Y., Gilgenbach, R.M., White, W.M., Jones, M.C., Bosman, H.L., Luginsland, J.W.
Format: Journal Article Conference Proceeding
Language:English
Published: New York, NY IEEE 01.04.2005
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Anodes
Applied sciences
Bunching
Electron beams
Electronic tubes, masers
Electronics
Exact sciences and technology
Instability
Kinematics
Klystrons
Low noise
Magnetic analysis
Magnetic fields
Magnetic noise
magnetron
microwave
Microwave ovens
Microwave tubes (eg, klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.)
Microwaves
Orbits
parametric instability
Plasma
Radio frequency
Space charge
Spokes
Stability
vacuum electronics
Vacuum microelectronics
Magnetron
Orbit
Low-noise
Space charge
Theoretical study
Microwave
Thermionic cathode
Modeling
Parametric instability
Periodic variation
Magnetic field effect
vacuum electronics
Bunching
Crossed fields
ISSN:0093-3813, 1939-9375
Online Access:Get full text
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Summary:Single particle orbit considerations show that the cycloidal orbits of electrons in a gap with crossed electric and magnetic fields lead to rapid spoke formation if the external magnetic field has a periodic variation. This spoke formation is primarily a result of kinematic bunching, which is independent of the radio frequency electric field and of the space charge field. A parametric instability in the orbits, which brings a fraction of the electrons from the cathode to the anode region, is discovered. These results are examined in light of the recent rapid startup, low noise magnetron experiments and simulations that employed periodic, azimuthal perturbations in the axial magnetic field.
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ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2005.844525