Multipactor in a coaxial transmission line. II. Particle-in-cell simulations

Semenov, V. E.; Zharova, N. A.; Udiljak, R.; Anderson, D.; Lisak, M.; Puech, J.

doi:10.1063/1.2710466

Cited by 42 publications

(16 citation statements)

References 7 publications

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“…eV which corresponds to copper (the first cross over point corresponds to the impact energy 37 1  W eV) as used in previous studies [28,29]. The field frequency was taken to be 30 GHz.…”

Section: Ecr Conditionmentioning

confidence: 99%

Reduction of the Multipactor Threshold Due to Electron Cyclotron Resonance

Semenov

Zharova

Zaitsev

et al. 2012

IEEE Trans. Plasma Sci.

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Single surface multipactor on metal surfaces is studied in the case when the microwave electric field is superimposed on a dc electric and a permanent magnetic field. Based on a simple analysis of the electron motion it is predicted that considerable reduction in the multipactor threshold is possible when the electron cyclotron frequency equals the microwave field frequency and the permanent magnetic field has the proper orientation with respect to the metal surface. The prediction is confirmed by numerical simulations, and some experimental indications of the reduced multipactor threshold are also presented.

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“…eV which corresponds to copper (the first cross over point corresponds to the impact energy 37 1  W eV) as used in previous studies [28,29]. The field frequency was taken to be 30 GHz.…”

Section: Ecr Conditionmentioning

confidence: 99%

Reduction of the Multipactor Threshold Due to Electron Cyclotron Resonance

Semenov

Zharova

Zaitsev

et al. 2012

IEEE Trans. Plasma Sci.

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“…At the initial stage of the discharge, the radiated electromagnetic field emitted by this electron is neglected in the equation of motion because it is very low in comparison with the RF single-carrier field (see [7,8,9,10,11,12,13,14]). …”

Section: Radiation Of a Multipactor Discharge Occurring In A Rectangumentioning

confidence: 99%

“…Concerning multipactor in particle accelerators, two types of effects can be distinguished: RF multipactoring in the structures [3,4], and beam-induced multipactor process driven by the field of the bunched beam [5,6]. Multipactor effect has been deeply investigated in several types of microwave waveguides with simple geometries, such as the parallelplate guide [7,8], the rectangular waveguide [10] and the coaxial transmission-line [11,12,13,14]. However, the interaction of a multipactor discharge occurring within a realistic waveguide component has not been deeply studied so far.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the electromagnetic radiation generated by a multipactor discharge occurring within a microwave passive component

Jimenez¹,

Gimeno²,

Miquel-Espanya³

et al. 2010

J. Phys. D: Appl. Phys.

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Multipactoring is a non-linear phenomenon that appears in high-power microwave equipment operating under vacuum conditions and causes several undesirable effects. In this paper, a theoretical and experimental study of the RF spectrum radiated by a multipactor discharge, occurring within a realistic microwave component based on rectangular waveguides, is reported. The electromagnetic coupling of a multipactor current to the fundamental propagative mode of a uniform waveguide has been analysed in the context of the microwave network theory. The discharge produced under a single-carrier RF voltage regime has been approached as a shunt current source exciting such a mode in a transmission-line gap region. By means of a simple equivalent circuit, this model allows prediction of the harmonics generated by the discharge occurring in a realistic passive waveguide component. Power spectrum radiated by a third-order multipactor discharge has been measured in an E-plane silver-plated waveguide transformer, thus validating qualitatively the presented theory to simulate the noise generated by a single-carrier multipactor discharge.

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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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Multipactor in a coaxial transmission line. II. Particle-in-cell simulations

Cited by 42 publications

References 7 publications

Reduction of the Multipactor Threshold Due to Electron Cyclotron Resonance

Reduction of the Multipactor Threshold Due to Electron Cyclotron Resonance

Analysis of the electromagnetic radiation generated by a multipactor discharge occurring within a microwave passive component

Non-resonant multipactor—A statistical model

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