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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 μs). 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-BWO's
Published in:
Plasma Science, IEEE Transactions on
(Volume:22
,
Issue:
5
)
Date of Publication: Oct 1994
- Page(s):
- 578 - 584
- ISSN :
- 0093-3813
- INSPEC Accession Number:
- 4836987
- Digital Object Identifier :
- 10.1109/27.338270
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 06 August 2002
- Issue Date :
- Oct 1994
- Sponsored by :
- IEEE Nuclear and Plasma Sciences Society
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