Study of an overmoded structure for megawatt Ka-band extended interaction klystron

Yifan Zu; Xuesong Yuan; Xiaotao Xu; Qingyun Chen; Matthew T. Cole; Yong Yin; Hailong Li; Bin Wang; Lin Meng; Yang Yan

doi:10.1063/5.0163920

Study of an overmoded structure for megawatt Ka-band extended interaction klystron

Yifan Zu, Xuesong Yuan, Xiaotao Xu, Qingyun Chen, Matthew T. Cole, Yong Yin, Hailong Li, Bin Wang, Lin Meng, Yang Yan

University of Electronic Science and Technology of China

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

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Abstract

For most applications in the millimeter wave band, corresponding to Ka and higher-frequency bands, relatively high atmospheric absorption necessitates the use of high-power sources. Here, a new approach for projecting an oversized beam tunnel in an overmoded structure by concentrating the axial field is demonstrated to meet the high-frequency and high-power demands of compact devices. Due to the enhanced intense beam loading capability of the interaction circuit, a six-cavity Ka-band extended interaction klystron with a four-coupling-hole disk-loaded structure is designed that can stably obtain high output power. An analysis of optimization tradeoffs from introducing high order modes for allowing the application of more powerful beams to improving high order mode field distribution for enhancing the electron-wave coupling and suppressing mode competition is reported. 3D particle-in-cell simulations show attainable output powers of 1.11 MW at 32.94 GHz with a saturated gain of 57 dB by injecting a 3.3 mm diameter electron beam with a current of 24 A.

Original language	English
Article number	103101
Journal	Physics of Plasmas
Volume	30
Issue number	10
DOIs	https://doi.org/10.1063/5.0163920
Publication status	Published - 31 Oct 2023

Bibliographical note

Funding Information:
This work was supported in part by the National Key Research and Development Program of China under Grant No. 2019YFA0210202, in part by the National Natural Science Foundation of China under Grant No. 61771096, and in part by the Fundamental Research Funds for the Central Universities under Grant No. ZYGX2019J012.

Funding

This work was supported in part by the National Key Research and Development Program of China under Grant No. 2019YFA0210202, in part by the National Natural Science Foundation of China under Grant No. 61771096, and in part by the Fundamental Research Funds for the Central Universities under Grant No. ZYGX2019J012.

ASJC Scopus subject areas

Condensed Matter Physics

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10.1063/5.0163920

POP23-AR-00907
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Yifan Zu, Xuesong Yuan, Xiaotao Xu, Qingyun Chen, Matthew T. Cole, Yong Yin, Hailong Li, Bin Wang, Lin Meng, Yang Yan; Study of an overmoded structure for megawatt Ka-band extended interaction klystron. Phys. Plasmas 1 October 2023; 30 (10): 103101. and may be found at https://doi.org/10.1063/5.0163920
Accepted author manuscript, 4.95 MB

Cite this

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abstract = "For most applications in the millimeter wave band, corresponding to Ka and higher-frequency bands, relatively high atmospheric absorption necessitates the use of high-power sources. Here, a new approach for projecting an oversized beam tunnel in an overmoded structure by concentrating the axial field is demonstrated to meet the high-frequency and high-power demands of compact devices. Due to the enhanced intense beam loading capability of the interaction circuit, a six-cavity Ka-band extended interaction klystron with a four-coupling-hole disk-loaded structure is designed that can stably obtain high output power. An analysis of optimization tradeoffs from introducing high order modes for allowing the application of more powerful beams to improving high order mode field distribution for enhancing the electron-wave coupling and suppressing mode competition is reported. 3D particle-in-cell simulations show attainable output powers of 1.11 MW at 32.94 GHz with a saturated gain of 57 dB by injecting a 3.3 mm diameter electron beam with a current of 24 A.",

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AU - Yin, Yong

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Study of an overmoded structure for megawatt Ka-band extended interaction klystron

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