NDLI: Particle-in-cell simulations of start-up dynamics in a grounded cathode magnetron

Content Provider	IEEE Xplore Digital Library
Author	Gomberoff, K. Deutsch, A.
Copyright Year	1973
Abstract	Simulations results of a relativistic magnetron using the MAGIC particle-In-cell (PIC) code are reported. The time evolution of the buildup process for different magnetron azimuthal modes is studied for a variety of initial voltages, with and without a second, oscillatory small voltage in addition to the drive. The self-field is seen to evolve so that the anode-cathode voltage nears the Buneman-Hartree voltage of a particular mode. Simulations show that the output power is larger in the case where the voltage dynamically approaches the Buneman-Hartree value from above than when it is approached from below. The time evolution of a pure mode (without mode competition) resembles the time evolution of some autoresonant systems. An oscillatory voltage, of relatively small amplitude, fixed or chirped in frequency is seen to modify mode competition. The frequency of the first occurring mode is shown to follow the external drive with small phase deviations. This appears to be the beginning of an autoresonance process driven by the external drive, which stops abruptly at the mode transition. Small changes in the azimuthal structure are seen to lead to different mode dynamics; when the pi-mode symmetry is enforced other competing modes are suppressed to some extent
Sponsorship	IEEE Nuclear and Plasma Sciences Society
Starting Page	590
Ending Page	605
Page Count	16
File Size	5072191
File Format	PDF
ISSN	00933813
Volume Number	34
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cathodes Voltage Voltage-controlled oscillators Frequency Microwave devices Microwave oscillators Magnetic devices Geometry Power generation Chirp simulation Magnetrons microwave generation microwave tubes nonlinear oscillators phase locked oscillators
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics

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