Conformal mapping analysis of multipactor breakdown in waveguide irises

Semenov, V. E.; Rakova, E.; Udiljak, R.; Anderson, Dan; Lisak, M.; Puech, J.

doi:10.1063/1.2884712

Cited by 31 publications

(17 citation statements)

References 11 publications

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“…An explanation of this phenomenon is that lower w/a values allow electrons to escape from the gap region, so an extra voltage is needed in order to compensate this phenomenon. Similar multipactor behavior is found for waveguide irises [24]- [26], where the power threshold increases when the h/l ratio is higher (h is the gap height and l is the iris length). Two different mechanisms for electron loss were proposed for an iris scenario.…”

Section: Multipactor Susceptibility Chartsmentioning

confidence: 50%

Multipactor Susceptibility Charts for Ridge and Multiridge Waveguides

Gonzalez-Iglesias

Soto

Anza

et al. 2012

IEEE Trans. Electron Devices

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Abstract-The aim of this letter is to study the multipactor RF breakdown voltage in several ridge and multi-ridge waveguide configurations. Firstly, multipactor susceptibility charts for several types of ridged waveguides have been computed using the commercial software FEST3D. Next, these charts have been used to predict multipactor threshold values for a band-pass filter and a quasi low-pass filter both containing ridge waveguide sections. Furthermore, multipactor simulations using FEST3D are carried out to calculate the multipactor threshold of the aforementioned structures. A good agreement between predictions and simulations has been found for both filter examples.Index Terms-Ridge waveguide, Multi-ridge waveguide, Multipactor effect, RF breakdown.

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Section: Multipactor Susceptibility Chartsmentioning

confidence: 50%

Multipactor Susceptibility Charts for Ridge and Multiridge Waveguides

Gonzalez-Iglesias

Soto

Anza

et al. 2012

IEEE Trans. Electron Devices

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“…A more rigorous and detailed analysis of the iris problem was made in [2] where the geometry of the iris was transformed into the classical 2 infinite parallel plate geometry using conformal mapping assuming that the electric field in the iris was approximately quasi-static. In parallel, a software called SEMA/MULSIM based on the Monte-Carlo approach was developed to determine the Multipactor threshold inside RF components with waveguide sections.…”

Section: Fig 2 Multipacor Chart In the Iris Casementioning

confidence: 99%

CNES – Chalmers – IAP – ONERA - XLIM activities in the domain of high RF power breakdown phenomena

Puech

Sorolla

Semenov³

et al. 2017

EPJ Web Conf.

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Abstract.Multipactor breakdown is an important potential failure mechanism in many different microwave devices working under close to vacuum conditions. Applications range from space borne RF equipment to high-power microwave generators. The basic physics involved in the multipactor phenomenon is well known for the case of two infinite pallel plates made of metal. However, most realistic RF device geometries involve inhomogeneous RF electric fields and curved field lines and sometimes also dielectric material. The purpose of this paper is to set up methodologies to determine the Multipactor threshold in such situations.

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“…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%

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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Conformal mapping analysis of multipactor breakdown in waveguide irises

Cited by 31 publications

References 11 publications

Multipactor Susceptibility Charts for Ridge and Multiridge Waveguides

Multipactor Susceptibility Charts for Ridge and Multiridge Waveguides

CNES – Chalmers – IAP – ONERA - XLIM activities in the domain of high RF power breakdown phenomena

Non-resonant multipactor—A statistical model

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