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Title: 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 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.
Authors:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-17-24412
Journal ID: ISSN 0018-9383; TRN: US1800791
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Electron Devices
Additional Journal Information:
Journal Volume: 63; Journal Issue: 11; Journal ID: ISSN 0018-9383
Publisher:
IEEE
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; Electron beams; millimeter-wave amplifiers; traveling-wave tubes (TWTs); Laser beams; Focusing; Undulators; Cathodes; Dielectric constant
OSTI Identifier:
1415390

Carlsten, Bruce Eric, Nichols, Kimberley E., Shchegolkov, Dmitry Yu., and Simakov, Evgenya Ivanovna. Emittance Effects on Gain in $W$ -Band TWTs. United States: N. p., Web. doi:10.1109/TED.2016.2612583.
Carlsten, Bruce Eric, Nichols, Kimberley E., Shchegolkov, Dmitry Yu., & Simakov, Evgenya Ivanovna. Emittance Effects on Gain in $W$ -Band TWTs. United States. doi:10.1109/TED.2016.2612583.
Carlsten, Bruce Eric, Nichols, Kimberley E., Shchegolkov, Dmitry Yu., and Simakov, Evgenya Ivanovna. 2016. "Emittance Effects on Gain in $W$ -Band TWTs". United States. doi:10.1109/TED.2016.2612583. https://www.osti.gov/servlets/purl/1415390.
@article{osti_1415390,
title = {Emittance Effects on Gain in $W$ -Band TWTs},
author = {Carlsten, Bruce Eric and Nichols, Kimberley E. and Shchegolkov, Dmitry Yu. and Simakov, Evgenya Ivanovna},
abstractNote = {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.},
doi = {10.1109/TED.2016.2612583},
journal = {IEEE Transactions on Electron Devices},
number = 11,
volume = 63,
place = {United States},
year = {2016},
month = {10}
}