Full-scale three-dimensional electromagnetic simulations of a terahertz folded-waveguide traveling-wave tube using ICEPIC

Gensheimer, PD; Walker, CK; Ziolkowski, RW; Drouet D'Aubigny, C

Full-scale three-dimensional electromagnetic simulations of a terahertz folded-waveguide traveling-wave tube using ICEPIC

Gensheimer, PD Walker, CK Ziolkowski, RW

Drouet D'Aubigny, C

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Publication Type:: Journal Article
Citation:: IEEE Transactions on Terahertz Science and Technology, 2012, 2 (2), pp. 222 - 230
Issue Date:: 2012-03-01

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Field	Value	Language
dc.contributor.author	Gensheimer, PD	en_US
dc.contributor.author	Walker, CK	en_US
dc.contributor.author	Ziolkowski, RW https://orcid.org/0000-0003-4256-6902	en_US
dc.contributor.author	Drouet D'Aubigny, C	en_US
dc.date.issued	2012-03-01	en_US
dc.identifier.citation	IEEE Transactions on Terahertz Science and Technology, 2012, 2 (2), pp. 222 - 230	en_US
dc.identifier.issn	2156-342X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/115155
dc.description.abstract	This paper discusses simulation and modeling of the slow wave structure of a folded-waveguide terahertz traveling wave tube (TWT) using the Improved Concurrent Electromagnetic Particle In Cell (ICEPIC) software. This is the first time ICEPIC has been used for simulation of a TWT amplifier. Cold test simulations compare favorably with analytical models; at 368 GHz, the on-axis interaction impedance is 7.8 $\Omega$. Hot test (beam included) ICEPIC simulations were used to determine the effects of space charge on the gain calculations. At 368 GHz, the normalized beam plasma frequency from ICEPIC simulations is ${\mit\Omega}{p}=0.56$. Analysis of our ICEPIC simulations at 368 GHz indicates a normalized beam plasma frequency 75% larger than an analytical model we improvised from a sheath helix model taken from the literature. The hot test ICEPIC simulations at 368 GHz for a 64 periods long slow wave structure and a 10 mA, 25 kV electron beam produce small signal gain of 27 dB. The small-signal fractional 3-dB bandwidth of the TWT is 2.9%. The saturated fractional 3-dB bandwidth is 3.2%. Large signal simulations indicate that the saturated power at 368 GHz is 39.4 dBm and the saturated gain is 21.8 dB. A snapshot of a cross section of the electron beam shows bunching in space and a corresponding modulation in the velocity of the electron beam. © 2011 IEEE.	en_US
dc.relation.ispartof	IEEE Transactions on Terahertz Science and Technology	en_US
dc.relation.isbasedon	10.1109/TTHZ.2011.2178931	en_US
dc.title	Full-scale three-dimensional electromagnetic simulations of a terahertz folded-waveguide traveling-wave tube using ICEPIC	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.for	0906 Electrical and Electronic Engineering	en_US
utslib.for	0205 Optical Physics	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - GBDTC - Global Big Data Technologies
utslib.copyright.status	closed_access
pubs.issue	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	2	en_US

Abstract:

This paper discusses simulation and modeling of the slow wave structure of a folded-waveguide terahertz traveling wave tube (TWT) using the Improved Concurrent Electromagnetic Particle In Cell (ICEPIC) software. This is the first time ICEPIC has been used for simulation of a TWT amplifier. Cold test simulations compare favorably with analytical models; at 368 GHz, the on-axis interaction impedance is 7.8 $\Omega$. Hot test (beam included) ICEPIC simulations were used to determine the effects of space charge on the gain calculations. At 368 GHz, the normalized beam plasma frequency from ICEPIC simulations is ${\mit\Omega}{p}=0.56$. Analysis of our ICEPIC simulations at 368 GHz indicates a normalized beam plasma frequency 75% larger than an analytical model we improvised from a sheath helix model taken from the literature. The hot test ICEPIC simulations at 368 GHz for a 64 periods long slow wave structure and a 10 mA, 25 kV electron beam produce small signal gain of 27 dB. The small-signal fractional 3-dB bandwidth of the TWT is 2.9%. The saturated fractional 3-dB bandwidth is 3.2%. Large signal simulations indicate that the saturated power at 368 GHz is 39.4 dBm and the saturated gain is 21.8 dB. A snapshot of a cross section of the electron beam shows bunching in space and a corresponding modulation in the velocity of the electron beam. © 2011 IEEE.

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http://hdl.handle.net/10453/115155