Intense electron-beam cyclotron masers with microsecond pulse lengths. Final report, 1 Aug 88-30 Nov 91

Technical Report · Fri Dec 20 00:00:00 EST 1991

OSTI ID:5413000

Gilgenbach, R M

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.

• Research Organization: Michigan Univ., Ann Arbor, MI (United States). Intense Energy Beam Interaction Lab.
• OSTI ID: 5413000
• Report Number(s): AD-A-247060/7/XAB; CNN: AFOSR-88-0276
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
MASERS
RESEARCH PROGRAMS
ACCELERATORS
CAVITY RESONATORS
CYCLOTRONS
ELECTRON BEAMS
HARMONIC GENERATION
MICROWAVE EQUIPMENT
PULSES
AMPLIFIERS
BEAMS
CYCLIC ACCELERATORS
ELECTRONIC EQUIPMENT
EQUIPMENT
FREQUENCY MIXING
LEPTON BEAMS
MICROWAVE AMPLIFIERS
PARTICLE BEAMS
RESONATORS
426002* - Engineering- Lasers & Masers- (1990-)