Multipactor Breakdown Prediction in a Rectangular Waveguide: Statistical Theory and Simulation Results

Sazontov, A. G.; Sazontov, V. A.; Vdovicheva, N. K.

doi:10.1002/ctpp.200810057

Cited by 32 publications

(14 citation statements)

References 16 publications

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“…The electrons that are not short range will drift away from the surface, and will only return due to some external force, for example the ponderomotive force of an electric inhomogeneity 10,19,29 . These are the long range electrons.…”

Section: A Electron Emissionmentioning

confidence: 99%

“…Only in a few cases [5][6][7][8][9][10][11][12][13][14] can the problem be treated analytically. This has motivated the wide use of numerical simulations, both particle-in-cell (PIC) and Monte Carlo, to calculate the breakdown thresholds and study the electron trajectories.…”

Section: Introductionmentioning

confidence: 99%

“…For complicated structures this process becomes extremely complex. For this reason, the statistical approach has so far only been applied to double-sided multipactor between parallel plates [15][16][17][18] , in a rectangular waveguide 19 , and single-sided multipactor on a dielectric surface 20 . The theory has also recently been generalized to multicarrier signals, again in the parallel plates geometry 21 .…”

Section: Introductionmentioning

confidence: 99%

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Non-resonant multipactor—A statistical model

Rasch

Johansson

2012

Physics of Plasmas

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High power microwave systems operating in vacuum or near vacuum run the risk of multipactor breakdown. In order to avoid multipactor, it is necessary to make theoretical predictions of critical parameter combinations. These treatments are generally based on the assumption of electrons moving in resonance with the electric field while traversing the gap between critical surfaces.Through comparison with experiments, it has been found that only for small system dimensions will the resonant approach give correct predictions. Apparently, the resonance is destroyed due to the statistical spread in electron emission velocity, and for a more valid description it is necessary to resort to rather complicated statistical treatments of the electron population, and extensive simulations. However, in the limit where resonance is completely destroyed it is possible to use a much simpler treatment, here called non-resonant theory. In this paper we develop the formalism for this theory, use it to calculate universal curves for the existence of multipactor, and compare with previous results. Two important effects that leads to an increase in the multipactor threshold in comparison with the resonant prediction are identified. These are the statistical spread of impact speed, which leads to a lower average electron impact speed, and the impact of electrons in phase regions where the secondary electrons are immediately reabsorbed, leading to an effective removal of electrons from the discharge.

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Section: A Electron Emissionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Non-resonant multipactor—A statistical model

Rasch

Johansson

2012

Physics of Plasmas

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“…This type of discharge is an undesirable phenomenon in many practical microwave applications and the intense study of this phenomenon during the last decades has mainly been stimulated by the necessity to be able to accurately predict the multipactor threshold in different microwave subsystems. [1][2][3][4][5] These studies have resulted in development of various numerical tools capable of simulating multipactor in different geometries including parallel plates, 6,7 coaxial cables, [8][9][10] dielectric windows, [11][12][13] rectangular and wedge-shaped waveguides, [14][15][16] microstrip lines, 17 waveguide irises, [18][19][20] and rf filters and transformers. [21][22][23] A notable exception is multipactor breakdown in circular waveguides, which has been given scant interest, in spite of its technical importance.…”

Section: Introductionmentioning

confidence: 99%

Simulations of multipactor in circular waveguides

et al. 2010

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Detailed numerical simulations have been done to investigate the properties of multipactor breakdown in circular waveguides operating in the propagating fundamental TE11 mode. Main attention has been given to a comparison between the two fundamental cases corresponding to linear and circular polarizations, respectively, of the propagating electromagnetic wave. It is found that circular polarization is considerably more susceptible to multipactor than linear polarization. The reason for this difference is clarified by a comprehensive study of the electron motion in the waveguide.

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“…Recent studies on statistical multipactor describe a more realistic scenario where the random nature of the electron emission velocity is considered [VSS04,VSSS06,SSV08]. In fact, if the velocity spread becomes large enough, the flight time of electrons can strongly vary from impact to impact, even intercalated with single surface impacts, and still have an overall SEY higher than one.…”

Section: -mentioning

confidence: 99%

Multipactor in Multicarrier Systems. Theory and Prediction

Anza¹

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A mis padres, a mis hijos, Darío y Marco. AgradecimientosLos inicios de esta tesis doctoral se remontan allá por el 2006 cuando Vicente Boria me ofreció la oportunidad de hacer el doctorado dentro una empresa tecnológica valenciana que acababa de nacer: Aurorasat. Por circunstancias de la vida, en ese momento yo estaba embarcado en otro proyecto profesional. Pero Vicente, como siempre, fue muy persuasivo y finalmente me convenció para unirme a ellos. De todas las decisiones que he tomado, en todos losámbitos de mi vida,ésta creo que ha sido una de las más acertadas. Vicente, te doy las gracias por confiar en mí desde el principio y permitirme poder unirme al grupo fantástico que integra Aurorasat donde he trabajado, disfrutado y crecido en el plano profesional y personal durante estosúltimos años.Fruto de esta relación ha nacido esta tesis doctoral, que ha tenido una larga gestación de casi 8 años. Desde el instante t = 0, Carlos Vicente ha sido una referencia para mí, tanto por su inagotable conocimiento científico, como por su capacidad de trabajo, intuición y liderazgo. Carlos, por todo esto y por ser una gran persona y mejor amigo, te doy las gracias.Durante todo este tiempo, Benito Gimeno me ha ofrecido su inestimable apoyo y guía. Benito, como buen físico, siempre has apostado por sacar mi lado científico y por usar rigurosa formulación teórica, algo que los ingenieros siempre estamos gustosos a dejar de lado si existe alguna herramienta más práctica. Gracias por tu confianza y amistad.Otro gran protagonista es Jordi Gil, que aunque no ha div rigido oficialmente este trabajo, siempre ha sido el primero en interesarse porél y en darme empujones cuando hacían falta. Al final, incluso se ofreció a corregir capítulos de la tesis "por placer", lo que dice mucho de su alta implicación (o de su masoquismo extremo). Gracias Jordi por tu apoyo, y por ayudar a que este trabajo se entienda un poquito mejor. Eres un gran profesional y amigo. Quiero también dar las gracias a Michael Mattes de laÉcole Polytechnique Fédérale de Lausanne, por sus interesantes discusiones científicas y contribuciones a este trabajo.En el aspecto personal, siempre me he quejado de lo larga que se me estaba haciendo esta tesis. Pero a decir verdad el tiempo se me ha pasado volando. Eso es gracias a que todos los días he ido con ilusión y ganas al trabajo. Estoy rodeado de grandes profesionales y amigos en lo que considero ya como una segunda familia. No tengo espacio para escribir las líneas que debería dedicarle, por justicia, a cada uno de los integrantes de Aurorasat, que han vivido mi tesis como parte de lo cotidiano. Me limito a citar sus nombres, en un profundo gracias, a los que están y estuvieron: Jaime, Teresa, María, Carmen, Javi, Mario, Carlos G., Carlos C., Esteban, Iñaki, Javi Monge, et al.Sería injusto no mencionar a los compañeros del IEEC de Barcelona de los que guardo un gran recuerdo: Carlo, Anna, Alina, Moi, Miquel, Silvia, Violeta, Pep, Josep, Jose, Oleguer, Santi y Estel entre otros. Un abrazo a todos ellos.He tenido sue...

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Multipactor Breakdown Prediction in a Rectangular Waveguide: Statistical Theory and Simulation Results

Cited by 32 publications

References 16 publications

Non-resonant multipactor—A statistical model

Non-resonant multipactor—A statistical model

Simulations of multipactor in circular waveguides

Multipactor in Multicarrier Systems. Theory and Prediction

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