Development of High Power CARM (Cyclotron Auto-Resonance Maser) Oscillators
Abstract
The Cyclotron Auto-Resonance Maser (CARM) is under investigation at the U.S. Naval Research Laboratory as an efficient source of high power millimeter-wave and submillimeter-wave radiation for applications such as plasma heating, advanced rf accelerators, and space-based radars. A short-pulse 100 GHz CARM oscillator experiment based on a 600 kV, 200 Amp, 50 nsec electron beam is under way. The mode selective, high-Q waveguide cavity with rippled-wall Bragg reflectors is designed to operate in the TE61 mode. A novel code cathode diode is used to produce a high quality annular beam with a momentum pitch ratio of 0. 6. The cathode features nonemitting focussing electrodes and an annular velvet emitter. The main objective of the experiment is to demonstrate high efficiency approx. 20% at a power of approximately 20 MW. In addition, a long pulse 250 GHz CARM oscillator experiment based on a 500 kV, 100 Amp, 1 microsec MIG-type thermionic cathode electron gun is planned. The design of these experiments and the optimization of CARM oscillator efficiency are discussed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 14, 1989
- Accession Number
- ADA206270
Entities
People
- Arne W. Fliflet
- C. A. Sullivan
- D. A. Kirkpatrick
- R. B. Mccowan
- Steven H. Gold
Organizations
- United States Naval Research Laboratory