A high directivity broadband corrugated horn for W-band gyro-devices

P. McElhinney; C. R. Donaldson; W. He; L. Zhang; K. Ronald; A. D. R. Phelps; A. W. Cross

doi:10.1109/PLASMA.2012.6383829

A high directivity broadband corrugated horn for W-band gyro-devices

P. McElhinney, C. R. Donaldson, W. He, L. Zhang, K. Ronald, A. D. R. Phelps, A. W. Cross

Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

Abstract

A quasi-optical corrugated horn has been constructed for a W band gyro-TWA based on a cusp electron beam source with a helically corrugated interaction region. The design is intended to provide an effective method to decouple the radiation and the beam so that a depressed collector energy recovery system may be used. The horn converts a cylindrical TE 11 mode into a free-space TEM 00 mode over a frequency band of 84 to 104 GHz. This Gaussian mode can pass through the collector system unperturbed. This type of mode converter was chosen due to the performance advantages of greater bandwidth and continuous operation over this bandwidth. The design was optimized using a mode matching method that predicts a reflection of better than -35 dB and a Gaussian coupling efficiency of 97.8%. The prototype, which has been constructed and tested, demonstrates a close agreement with these figures.

Original language	English
Title of host publication	2012 Abstracts IEEE International Conference on Plasma Science
Place of Publication	Piscataway, N.J.
Publisher	IEEE
Number of pages	1
ISBN (Print)	978-1-4577-2127-4
DOIs	https://doi.org/10.1109/PLASMA.2012.6383829
Publication status	Published - 24 Dec 2012

Keywords

electromagnetic coupling
helical waveguide
gyrotrons
Gaussian mode

Access to Document

10.1109/PLASMA.2012.6383829

Cite this

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title = "A high directivity broadband corrugated horn for W-band gyro-devices",

abstract = "A quasi-optical corrugated horn has been constructed for a W band gyro-TWA based on a cusp electron beam source with a helically corrugated interaction region. The design is intended to provide an effective method to decouple the radiation and the beam so that a depressed collector energy recovery system may be used. The horn converts a cylindrical TE 11 mode into a free-space TEM 00 mode over a frequency band of 84 to 104 GHz. This Gaussian mode can pass through the collector system unperturbed. This type of mode converter was chosen due to the performance advantages of greater bandwidth and continuous operation over this bandwidth. The design was optimized using a mode matching method that predicts a reflection of better than -35 dB and a Gaussian coupling efficiency of 97.8%. The prototype, which has been constructed and tested, demonstrates a close agreement with these figures.",

keywords = "electromagnetic coupling, helical waveguide, gyrotrons, Gaussian mode",

author = "P. McElhinney and Donaldson, {C. R.} and W. He and L. Zhang and K. Ronald and Phelps, {A. D. R.} and Cross, {A. W.}",

year = "2012",

month = dec,

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doi = "10.1109/PLASMA.2012.6383829",

language = "English",

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booktitle = "2012 Abstracts IEEE International Conference on Plasma Science",

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T1 - A high directivity broadband corrugated horn for W-band gyro-devices

AU - McElhinney, P.

AU - Donaldson, C. R.

AU - He, W.

AU - Zhang, L.

AU - Ronald, K.

AU - Phelps, A. D. R.

AU - Cross, A. W.

PY - 2012/12/24

Y1 - 2012/12/24

N2 - A quasi-optical corrugated horn has been constructed for a W band gyro-TWA based on a cusp electron beam source with a helically corrugated interaction region. The design is intended to provide an effective method to decouple the radiation and the beam so that a depressed collector energy recovery system may be used. The horn converts a cylindrical TE 11 mode into a free-space TEM 00 mode over a frequency band of 84 to 104 GHz. This Gaussian mode can pass through the collector system unperturbed. This type of mode converter was chosen due to the performance advantages of greater bandwidth and continuous operation over this bandwidth. The design was optimized using a mode matching method that predicts a reflection of better than -35 dB and a Gaussian coupling efficiency of 97.8%. The prototype, which has been constructed and tested, demonstrates a close agreement with these figures.

AB - A quasi-optical corrugated horn has been constructed for a W band gyro-TWA based on a cusp electron beam source with a helically corrugated interaction region. The design is intended to provide an effective method to decouple the radiation and the beam so that a depressed collector energy recovery system may be used. The horn converts a cylindrical TE 11 mode into a free-space TEM 00 mode over a frequency band of 84 to 104 GHz. This Gaussian mode can pass through the collector system unperturbed. This type of mode converter was chosen due to the performance advantages of greater bandwidth and continuous operation over this bandwidth. The design was optimized using a mode matching method that predicts a reflection of better than -35 dB and a Gaussian coupling efficiency of 97.8%. The prototype, which has been constructed and tested, demonstrates a close agreement with these figures.

KW - electromagnetic coupling

KW - helical waveguide

KW - gyrotrons

KW - Gaussian mode

U2 - 10.1109/PLASMA.2012.6383829

DO - 10.1109/PLASMA.2012.6383829

M3 - Conference contribution book

SN - 978-1-4577-2127-4

BT - 2012 Abstracts IEEE International Conference on Plasma Science

PB - IEEE

CY - Piscataway, N.J.

ER -

A high directivity broadband corrugated horn for W-band gyro-devices

Abstract

Keywords

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