Multimodal Characterization of the Multipactor Effect in Microwave Waveguide Components

Jimenez, M Manuel; Martínez, Benito Gimeno; Raboso, D.; Anza, S.; Alvarez, Alejandro; Quesada, Fernando; Boria, Vicente E.; Vicente, C.; Gil, J.

doi:10.1109/lmwc.2011.2181831

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…A particular model must be developed for each particular rf circuit. Examples of simulations for some rf filter configurations can be found in [9][10][11][12].…”

Section:  Mmentioning

confidence: 99%

Simple model of the rf noise generated by multipacting electrons

Semenov¹,

Rakova²,

Zharova³

et al. 2014

J. Phys. D: Appl. Phys.

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A simplified analytical model is developed to predict the spectrum of electric current induced by the multipacting electrons between two parallel electrodes exposed to an rf voltage of fixed amplitude. The model is based on the resonant multipactor theory and makes it possible to calculate the relative spectral amplitudes of electric current at different harmonics and sub-harmonics of the applied rf frequency. The theoretical predictions are confirmed by numerical simulations of multipactor inside a rectangular waveguide. Specifically it is seen that the relative height of the spectral peaks decreases with increasing gap height.

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“…A particular model must be developed for each particular rf circuit. Examples of simulations for some rf filter configurations can be found in [9][10][11][12].…”

Section:  Mmentioning

confidence: 99%

Simple model of the rf noise generated by multipacting electrons

Semenov¹,

Rakova²,

Zharova³

et al. 2014

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…Therefore multipactor prediction is an important technical problem, and when new rf equipment is designed it is standard practice to take into account the multipactor limits. Typically, accurate predictions of the multipactor threshold inside realistic rf components requires extended numerical simulations [1][2][3]. However, more general analytical studies can be also very useful when it is necessary to search for the components which are the best protected against multipactor.…”

Section: Introductionmentioning

confidence: 99%

General Study of Multipactor Between Curved Metal Surfaces

Semenov¹,

Rasch

Rakova³

et al. 2014

IEEE Trans. Plasma Sci.

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An analytical study of the electron trajectories between two opposite electrodes having curved surfaces is undertaken for the case when the electron transit time exceeds the rf period. The analysis is based on a statistical approach which makes it possible to calculate the width of an electron bunch after a number of electron transits taking into account the spread of electron emission velocity, and the spatial non-uniformity of the rf field using the concept of the ponderomotive force. The results are used to estimate the multipactor threshold in terms of a value of the secondary emission yield which is necessary to balance electron losses. Based on the model it is predicted that multipactor is impossible inside the realistic configuration of a helix antenna where four electrodes are placed on the same cylindrical surface.

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Effect analysis of angular momentum on coaxial multipactor with 1D3V statistical modeling

Lin

Wong

et al. 2022

Physics of Plasmas

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How does the multipactor threshold voltage vary when two semi-infinite parallel plates are bent into coaxial lines? This topic with respect to the geometric effect on multipactor formation is essential for the optimal design of multipactor-free microwave systems. It requires accurate multipactor threshold analysis of the coaxial lines with the consideration of electron angular momentum, which is not considered in most multipactor theoretical approaches for efficient threshold calculations. To address this effect from the perspective of multipactor threshold analysis, this work presents an improved implementation of the multipactor statistical modeling (1D3V modeling) by constructing the joint probability density function with angular emissions and impacts of secondary electrons included. On that basis, a multipactor susceptibility chart of coaxial lines is conducted and compared with the experimental results, and multipactor threshold voltage for varying ratios of outer to inner conductor radii (radius ratio) is calculated to quantitatively investigate the effect of electron angular momentum. The results indicate that the 1D3V modeling can achieve fairly good agreement with the experimental result and relatively better accuracy of threshold calculation at first multipactor orders with comparison to the 1D1V result which only regards the radial momentum. With different variations of the threshold voltage from the 1D1V result, the 1D3V result reaches its minimum at a specific radius ratio before the sudden rise, and the discrepancy becomes more significant for the high-order multipactor, revealing the indispensable effect of angular momentum on the coaxial multipactor. The intricacies of the mechanism analysis will be further explored in the paper.

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Multimodal Characterization of the Multipactor Effect in Microwave Waveguide Components

Cited by 6 publications

References 7 publications

Simple model of the rf noise generated by multipacting electrons

Simple model of the rf noise generated by multipacting electrons

General Study of Multipactor Between Curved Metal Surfaces

Effect analysis of angular momentum on coaxial multipactor with 1D3V statistical modeling

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