Intense Electron Beam Cyclotron Masers with Microsecond Pulselengths
Abstract
Results are reported for a three year research program with the goal of generating high power microwaves over long-pulselengths. Three types of cyclotron maser devices were developed and utilized in experiments on the Michigan Electron Long Beam Accelerator, (MELBA) at electron beam parameters of 0.6-0.9 MV, 0.52-2 kA, and 0.5-5 microsec: (1) The gyrotron backward-wave- oscillator, (gyro-BWO) produced the optimal combination of high power (1-8 MW) and long pulse (0.5-1.2 microsec) microwave generation. Due to these promising results, this gyro-BWO device was investigated most intensively during the final phase of this research program. (2) Bragg resonator cyclotron resonance masers were investigated with high quality, low current electron beams for high frequency microwave generation. These devices generated hundreds of kW for hundreds of ns, but it was found that microwaves originated from cyclotron harmonic generation on absolute instabilities. (3) Open cavity resonators of unslotted and slotted types generated microwave spikes (20-40 ns) in the X-band with peak power up to 15-25 MW. High peak microwave power (MW) was also generated in the K-band, most likely from the second cyclotron harmonic.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 20, 1991
- Accession Number
- ADA247060
Entities
People
- Ronald M. Gilgenbach
Organizations
- University of Michigan