PIC code simulation of pulsed radiation in a tapered closed-cavity gyrotron

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · IEEE Transactions on Plasma Science

DOI:https://doi.org/10.1109/27.532943· OSTI ID:377818

Wu, H; Liou, R L; McCurdy, A H ^[1]

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1. Univ. of Southern California, Los Angeles, CA (United States). Dept. of Electrical Engineering/Electrophysics

MAGIC, a two-and-one-half-dimensional particle-in-cell (PIC) code, has been used to investigate mode locking in closed-cavity gyrotrons. A cavity, with equally spaced modal frequencies, composed of a radially tapered section and a straight section of waveguide, is designed, built, and cold-tested. experimental cold test results agree well with the MAGIC PIC code simulations. Using a sinusoidal current density modulation with an amplitude of 5% of the dc current and frequency of 280 MHz, the simulation results show radiation output in a train of narrow pulses (full width at half maximum {approximately}1 ns) at a 2809 MHz repetition rate. Though the gyrotron does not appear to be mode locked, uniform pulse trains of 30--50 pulses can be obtained. The applications for short pulse microwave source include radar imaging of isolated targets, atmospheric sensing, Fourier transform spectroscopy, plasma diagnosis, and other time domain measurements.

• OSTI ID: 377818
• Journal Information: IEEE Transactions on Plasma Science, Journal Name: IEEE Transactions on Plasma Science Journal Issue: 3 Vol. 24; ISSN ITPSBD; ISSN 0093-3813
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CAVITY RESONATORS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
EXPERIMENTAL DATA
M CODES
MICROWAVE AMPLIFIERS
MODE LOCKING
THEORETICAL DATA