Emittance Effects on Gain in W -Band TWTs

We consider the main effects of beam emittance on W-band traveling-wave tube (TWT) performance and gain. Specifically, we consider a representative dielectric TWT structure with ~5 dB/cm of gain driven by a 5-A, 20-keV, sheet electron beam that is focused by a wiggler magnetic field. The normalized...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2016-11, Vol.63 (11), p.4493-4498
Main Authors: Carlsten, Bruce E., Nichols, Kimberley E., Shchegolkov, Dmitry Yu, Simakov, Evgenya I.
Format: Article
Language:English
Subjects:
Cathodes
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Dielectric constant
Electron beams
Focusing
Laser beams
MATERIALS SCIENCE
millimeter-wave amplifiers
traveling-wave tubes (TWTs)
Undulators
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Summary:We consider the main effects of beam emittance on W-band traveling-wave tube (TWT) performance and gain. Specifically, we consider a representative dielectric TWT structure with ~5 dB/cm of gain driven by a 5-A, 20-keV, sheet electron beam that is focused by a wiggler magnetic field. The normalized beam transverse emittance must be about 1 μm or lower to ensure that both the transport is stable and the gain is not degraded by the effective energy spread arising from the emittance. This emittance limit scales roughly inversely with frequency.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2016.2612583