Numerical Analysis of Resonant Multipolar Instabilities in High Power Klystrons

J. Cai; I. Syratchev; G. Burt

doi:10.1109/TED.2021.3083213

Numerical Analysis of Resonant Multipolar Instabilities in High Power Klystrons

J. Cai, I. Syratchev, G. Burt

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Abstract

The monopole monotron instability is a well-known phenomenon in linear beam devices. In recent development of a high-efficiency 50-MW X-band klystron, such instabilities were found and mitigated in a special second-harmonic multicell cavities triplet that is used to improve the klystron's performance. In further simulations of the klystron, using 3-D particle-in-cell computer codes, the more rare and complicated phenomenon, previously unreported in nonrelativistic devices, associated with rotating multipolar monotron instabilities was discovered. In this article, the qualitative and quantitative analysis of these oscillations is presented. Various resonant multipolar instabilities suppression strategies are introduced and discussed in detail.

Original language	English
Pages (from-to)	3617-3621
Number of pages	5
Journal	IEEE Transactions on Electron Devices
Volume	68
Issue number	7
Early online date	4/06/2021
DOIs	https://doi.org/10.1109/TED.2021.3083213
Publication status	Published - 31/07/2021

User-defined Keywords

Frequency conversion
Hybrid modes
instability
klystron.
Klystrons
Magnetic resonance
Oscillators
Solid modeling
Trajectory
Voltage measurement
Electron devices
Electronics engineering
Computer codes
High power klystron
High-efficiency
Linear beam
Nonrelativistic
Particle in cell
Qualitative and quantitative analysis
Second harmonics

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10.1109/TED.2021.3083213

IEEE_TED_Numerical_analysis_of_resonant_multipolar_instabilities_in_high_power_Klystrons_final
©2021 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Accepted author manuscript, 2.52 MBLicence: CC BY-NC: Creative Commons Attribution-NonCommercial 4.0 International License

https://ieeexplore.ieee.org/document/9447151

High efficiency Klystons
Burt, G. (Principal Investigator)
CERN - FAP Department
1/01/20 → 31/12/22
Project: Research

Cite this

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title = "Numerical Analysis of Resonant Multipolar Instabilities in High Power Klystrons",

abstract = "The monopole monotron instability is a well-known phenomenon in linear beam devices. In recent development of a high-efficiency 50-MW X-band klystron, such instabilities were found and mitigated in a special second-harmonic multicell cavities triplet that is used to improve the klystron's performance. In further simulations of the klystron, using 3-D particle-in-cell computer codes, the more rare and complicated phenomenon, previously unreported in nonrelativistic devices, associated with rotating multipolar monotron instabilities was discovered. In this article, the qualitative and quantitative analysis of these oscillations is presented. Various resonant multipolar instabilities suppression strategies are introduced and discussed in detail. ",

keywords = "Frequency conversion, Hybrid modes, instability, klystron., Klystrons, Magnetic resonance, Oscillators, Solid modeling, Trajectory, Voltage measurement, Electron devices, Electronics engineering, Computer codes, High power klystron, High-efficiency, Linear beam, Nonrelativistic, Particle in cell, Qualitative and quantitative analysis, Second harmonics",

author = "J. Cai and I. Syratchev and G. Burt",

note = "{\textcopyright}2021 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. ",

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T1 - Numerical Analysis of Resonant Multipolar Instabilities in High Power Klystrons

AU - Cai, J.

AU - Syratchev, I.

AU - Burt, G.

N1 - ©2021 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

PY - 2021/7/31

Y1 - 2021/7/31

N2 - The monopole monotron instability is a well-known phenomenon in linear beam devices. In recent development of a high-efficiency 50-MW X-band klystron, such instabilities were found and mitigated in a special second-harmonic multicell cavities triplet that is used to improve the klystron's performance. In further simulations of the klystron, using 3-D particle-in-cell computer codes, the more rare and complicated phenomenon, previously unreported in nonrelativistic devices, associated with rotating multipolar monotron instabilities was discovered. In this article, the qualitative and quantitative analysis of these oscillations is presented. Various resonant multipolar instabilities suppression strategies are introduced and discussed in detail.

AB - The monopole monotron instability is a well-known phenomenon in linear beam devices. In recent development of a high-efficiency 50-MW X-band klystron, such instabilities were found and mitigated in a special second-harmonic multicell cavities triplet that is used to improve the klystron's performance. In further simulations of the klystron, using 3-D particle-in-cell computer codes, the more rare and complicated phenomenon, previously unreported in nonrelativistic devices, associated with rotating multipolar monotron instabilities was discovered. In this article, the qualitative and quantitative analysis of these oscillations is presented. Various resonant multipolar instabilities suppression strategies are introduced and discussed in detail.

KW - Frequency conversion

KW - Hybrid modes

KW - instability

KW - klystron.

KW - Klystrons

KW - Magnetic resonance

KW - Oscillators

KW - Solid modeling

KW - Trajectory

KW - Voltage measurement

KW - Electron devices

KW - Electronics engineering

KW - Computer codes

KW - High power klystron

KW - High-efficiency

KW - Linear beam

KW - Nonrelativistic

KW - Particle in cell

KW - Qualitative and quantitative analysis

KW - Second harmonics

U2 - 10.1109/TED.2021.3083213

DO - 10.1109/TED.2021.3083213

M3 - Journal article

SN - 0018-9383

VL - 68

SP - 3617

EP - 3621

JO - IEEE Transactions on Electron Devices

JF - IEEE Transactions on Electron Devices

IS - 7

ER -

Numerical Analysis of Resonant Multipolar Instabilities in High Power Klystrons

Abstract

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High efficiency Klystons

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