Accession Number:

ADA261961

Title:

New Results and Applications for the Quasioptical Gyrotron

Descriptive Note:

Interim rept.

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

1993-02-26

Pagination or Media Count:

47.0

Abstract:

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.

Subject Categories:

  • Atmospheric Physics
  • Electrical and Electronic Equipment
  • Lasers and Masers
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE