New results and applications for the quasioptical gyrotron

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860706· OSTI ID:6483454

Fliflet, A W; Fischer, R P; Manheimer, W M ^[1]

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1. Plasma Physics Division, U.S. Naval Research Laboratory, Washington, D.C. 20375-5320 (United States)

The quasioptical gyrotron (QOG), which features an open resonator formed by a pair of spherical mirrors instead of the conventional gyrotron waveguide cavity, has been under development at the U. S. Naval Research Laboratory as a tunable high power millimeter-wave source for tokamak plasma heating, advanced radars, and power beaming. Results have recently been obtained for a quasioptical gyroklystron (QOGK) realized by the addition of an open-mirror prebunching resonator driven by an 85 GHz, 1.5 kW extended interaction oscillator. Efficiency enhancement by mode priming has been investigated, and efficiencies up to 19% have been obtained by increasing the frequency detuning of the operating mode. An overall efficiency of 30% was obtained by the addition of a simple depressed collector. Phase-locked operation was demonstrated at a power of 57 kW and efficiency of 16%. The high circulating power in the QOG resonator is currently being considered for use as an electromagnetic wiggler for compact infrared free-electron lasers. The QOG is also promising as a source for an active sensor of upper atmosphere trace impurities.

• OSTI ID: 6483454
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 5:7; ISSN 0899-8221; ISSN PFBPEI
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700390* -- Other Plasma Physics Studies-- (1992-)
CLOSED PLASMA DEVICES
EFFICIENCY
ELECTRON TUBES
ELECTRONIC EQUIPMENT
EQUIPMENT
FREE ELECTRON LASERS
HEATING
KLYSTRONS
LASERS
MICROWAVE EQUIPMENT
MICROWAVE TUBES
MIRRORS
PLASMA HEATING
RADIATION SOURCES
RESONATORS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES