New results and applications for the quasioptical gyrotron. Interim report

Technical Report · Fri Feb 26 04:00:00 EST 1993

OSTI ID:6535464

Fliflet, A W; Fischer, R P; Manheimer, W M

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 millimeterwave source for tokamak plasma heating, advanced radars, and power beaming. In the free running oscillator configuration, the QOG has produced a peak power of 6OOkW at a frequency of 120GHZ, and a peak efficiency of 12% at 200kW. Results have recently been obtained for a quasioptical gyroklystron (QOGK) realized by the addition of an open-mirror prebunching resonator driven by an 85GHz, 1.5kW Extended Interaction Oscillator. Efficiency enhancement by mode priming has been investigated, and efficiencies up to 19% have been obtained by increasing the detuning of the operating mode. An overall efficiency of 30% was obtained by the addition of a simple depressed collector. The high circulating power in the QOG resonator is currently being considered for use as an electromagnetic wiggler for compact IR free-electron lasers. The QOG is also promising as a source for an active sensor of upper atmosphere trace impurities.... Gyrotrons, Gyroklystron, Atmospheric sensing, Quasioptical gyrotron, Electromagnetic wiggler, Free-electron laser.

• Research Organization: Naval Research Lab., Washington, DC (United States)
• OSTI ID: 6535464
• Report Number(s): AD-A-261961/7/XAB; NRL/MR--6793-93-7183
• Country of Publication: United States
• Language: English

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