Observation of mode competition in an 11.4-GHz magnicon amplifier

Steven H. Gold; Arne W. Fliflet; Melissa K. Hornstein; Allen K. Kinkead

doi:10.1109/TPS.2008.923735

Observation of mode competition in an 11.4-GHz magnicon amplifier

Steven H. Gold, Arne W. Fliflet, Melissa K. Hornstein, Allen K. Kinkead

Research output: Contribution to journal › Article › peer-review

Abstract

This paper describes the observation of pulse shortening in an 11.4-GHz magnicon amplifier due to competition with a parasitic gyrotron mode. This effect was observed following the installation of a new electron beam collector. The parasitic mode occurred only at high operating powers, when the beam transverse momentum was high, and the growth of the parasitic mode caused the power in the output pulse to drop substantially. We analyze the competition between the gyrotron and magnicon modes in the output cavity using a time-dependent multimode gyrotron simulation code that has been specially modified to model competition between synchronous magnicon and nonsynchronous gyrotron interactions, and compare the results to experimental observations. We also analyze the effect due to the change in the collector.

Original language	English (US)
Pages (from-to)	597-605
Number of pages	9
Journal	IEEE Transactions on Plasma Science
Volume	36
Issue number	3 PART 1
DOIs	https://doi.org/10.1109/TPS.2008.923735
State	Published - Jun 2008
Externally published	Yes

Keywords

Electron devices
Gyrotron
Magnicon
Microwave amplifier
Parasitic mode

ASJC Scopus subject areas

Nuclear and High Energy Physics
Condensed Matter Physics

Online availability

10.1109/TPS.2008.923735

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title = "Observation of mode competition in an 11.4-GHz magnicon amplifier",

abstract = "This paper describes the observation of pulse shortening in an 11.4-GHz magnicon amplifier due to competition with a parasitic gyrotron mode. This effect was observed following the installation of a new electron beam collector. The parasitic mode occurred only at high operating powers, when the beam transverse momentum was high, and the growth of the parasitic mode caused the power in the output pulse to drop substantially. We analyze the competition between the gyrotron and magnicon modes in the output cavity using a time-dependent multimode gyrotron simulation code that has been specially modified to model competition between synchronous magnicon and nonsynchronous gyrotron interactions, and compare the results to experimental observations. We also analyze the effect due to the change in the collector.",

keywords = "Electron devices, Gyrotron, Magnicon, Microwave amplifier, Parasitic mode",

author = "Gold, {Steven H.} and Fliflet, {Arne W.} and Hornstein, {Melissa K.} and Kinkead, {Allen K.}",

note = "Manuscript received September 21, 2007. This work was supported in part by the U.S. Department of Energy under Interagency Agreement DEAI0201ER41170 and in part by the U.S. Office of Naval Research.",

year = "2008",

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doi = "10.1109/TPS.2008.923735",

language = "English (US)",

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journal = "IEEE Transactions on Plasma Science",

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T1 - Observation of mode competition in an 11.4-GHz magnicon amplifier

AU - Gold, Steven H.

AU - Fliflet, Arne W.

AU - Hornstein, Melissa K.

AU - Kinkead, Allen K.

N1 - Manuscript received September 21, 2007. This work was supported in part by the U.S. Department of Energy under Interagency Agreement DEAI0201ER41170 and in part by the U.S. Office of Naval Research.

PY - 2008/6

Y1 - 2008/6

N2 - This paper describes the observation of pulse shortening in an 11.4-GHz magnicon amplifier due to competition with a parasitic gyrotron mode. This effect was observed following the installation of a new electron beam collector. The parasitic mode occurred only at high operating powers, when the beam transverse momentum was high, and the growth of the parasitic mode caused the power in the output pulse to drop substantially. We analyze the competition between the gyrotron and magnicon modes in the output cavity using a time-dependent multimode gyrotron simulation code that has been specially modified to model competition between synchronous magnicon and nonsynchronous gyrotron interactions, and compare the results to experimental observations. We also analyze the effect due to the change in the collector.

AB - This paper describes the observation of pulse shortening in an 11.4-GHz magnicon amplifier due to competition with a parasitic gyrotron mode. This effect was observed following the installation of a new electron beam collector. The parasitic mode occurred only at high operating powers, when the beam transverse momentum was high, and the growth of the parasitic mode caused the power in the output pulse to drop substantially. We analyze the competition between the gyrotron and magnicon modes in the output cavity using a time-dependent multimode gyrotron simulation code that has been specially modified to model competition between synchronous magnicon and nonsynchronous gyrotron interactions, and compare the results to experimental observations. We also analyze the effect due to the change in the collector.

KW - Electron devices

KW - Gyrotron

KW - Magnicon

KW - Microwave amplifier

KW - Parasitic mode

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Observation of mode competition in an 11.4-GHz magnicon amplifier

Abstract

Keywords

ASJC Scopus subject areas

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