Effects of tapered tubes on long-pulse microwave emission from intense e-beam gyrotron-backward-wave-oscillators

Journal Article · Sat Oct 01 00:00:00 EDT 1994 · IEEE Transactions on Plasma Science (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/27.338270· OSTI ID:6533734

Walter, M T; Gilgenbach, R M ^[1]; Menge, P R ^[2]; Spencer, T A ^[3]

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1. Univ. of Michigan, Ann Arbor, MI (United States). Intense Energy Beam Interaction Lab.
2. Univ. of Michigan, Ann Arbor, MI (United States). Intense Energy Beam Interaction Lab. Sandia National Labs., Albuquerque, NM (United States)
3. Univ. of Michigan, Ann Arbor, MI (United States). Intense Energy Beam Interaction Lab. Air Force Phillips Lab., Kirtland AFB, NM (United States)

Experiments are reported on tapered-tube versus uniform-tube, gyrotron-backward-wave-oscillators (4.5--6 GHz) driven by an intense electron beam with parameters: 0.8 MV, 1--4 kA, and pulselength (0.5--1 [mu]s). Results show that, compared to a uniform interaction tube, a gyro-BWO with a 10% downtapered tube produces the following effects: (1) highest microwave peak-power (up to about 100 MW in internal tube), a factor of 2 higher than the uniform tube, (2) more reproducible long-pulse (400--500 ns) emission, and (3) the largest inferred-integrated energy (factor of 2.5--3 increase). Experiments show high power microwave spikes with lower power plateaus. Experimental observations are in qualitative agreement with MAGIC code simulations of uniform and tapered-tube gyro-BWOs.

• OSTI ID: 6533734
• Journal Information: IEEE Transactions on Plasma Science (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Plasma Science (Institute of Electrical and Electronics Engineers); (United States) Vol. 22:5; ISSN ITPSBD; ISSN 0093-3813
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426000* -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
AMPLIFIERS
BACKWARD WAVE TUBES
COMPARATIVE EVALUATIONS
DATA
DESIGN
ELECTRON TUBES
ELECTRONIC EQUIPMENT
EQUIPMENT
EVALUATION
EXPERIMENTAL DATA
INFORMATION
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
MICROWAVE TUBES
NUMERICAL DATA
PERFORMANCE
USES