Suppression of multipacting in rectangular coupler waveguides

Geng, Rongli; Padamsee, H.; Belomestnykh, S.; Goudket, P.; Dykes, D. M.; Carter, Richard G.

doi:10.1016/s0168-9002(03)01660-7

Cited by 45 publications

(25 citation statements)

References 8 publications

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“…These effects are essentially strong for the case of anisotropic emission: for the given set of parameters the discharge development is possible in a wide enough range of RF powers. The latter conclusion is in a qualitative agreement with the experimental data reported by Geng et al [8,9]. The results of secondary electron multipaction over a range of RF power is shown in Fig.…”

Section: Numerical Calculations and Resultssupporting

confidence: 92%

“…In particular, according to the dynamic approach the discharge can occur only for a set of discrete multipacting barriers that are well separated. However, the discrete multipacting band structure predicted by numerical simulation is sharp contrast with that obtained in experiments [8,9] in which a continuous band structure is observed. Such a discrepancy can be explained taking into account the velocity spread of secondary electrons.…”

Section: Introductioncontrasting

confidence: 96%

See 1 more Smart Citation

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

Sazontov¹,

Sazontov

Vdovicheva

2008

Contrib. Plasma Phys.

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Statistical theory of the initial study of the multipactor discharge in a rectangular waveguide is constructed. The recurrent relation between the emission phase and position distributions is derived taking into account the velocity spread of secondary electrons. A general integral equation allowing prediction of the threshold value of the secondary yield (above which electron multipaction occurs) is formulated. It has been found that the presence of directional anisotropy can significantly alter the multipacting discharge cutoff conditions in comparison with isotropic emission. It has been established that the combined action of tangential velocity components and magnetic field leads to an increase of the threshold of multipactor growth.

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Section: Numerical Calculations and Resultssupporting

confidence: 92%

Section: Introductioncontrasting

confidence: 96%

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

Sazontov¹,

Sazontov

Vdovicheva

2008

Contrib. Plasma Phys.

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show abstract

“…Recently, some authors proposed the use of DC magnetic fields for the partial or total discharge mitigation. Sometimes, the direction of the applied magnetic field is oriented along the transverse plane for a coaxial geometry [2], whilst an axial magnetic field is inserted for multipactor suppression in rectangular waveguides [3]- [7].…”

Section: Introductionmentioning

confidence: 99%

Multipactor Mitigation in Coaxial Lines by Means of Permanent Magnets

Gonzalez-Iglesias

Pérez

Anza³

et al. 2014

IEEE Trans. Electron Devices

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The main aim of this paper is the analysis of the feasibility of employing permanent magnets for the multipactor mitigation in a coaxial waveguide. First, the study of a coaxial line immersed in a uniform axial magnetic field shows that multipactor can be suppressed at any RF frequency if the external magnetic field is strong enough. Both theoretical simulations and experimental tests validate this statement. Next, multipactor breakdown of a coaxial line immersed in a hollow cylindrical permanent magnet is analyzed. Numerical simulations show that multipactor can be suppressed in a certain RF frequency range. The performed experimental test campaign demonstrates the capability of the magnet to avoid the multipactor electron multiplication process.

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“…This idea was originally introduced for particle accelerator systems in [6] and [7], and then, it was successfully applied and tested with a bandpass filter operating in the X-band for space applications [8], [9]. Following the interest toward wedgeshaped waveguides [6]- [9], an extended theoretical study of their MP discharge behavior concluded that these waveguides do also have a trapped electron trajectory (see [10]), which defines a critical initial position where the electrons should be launched for the MP prediction simulations.…”

Section: Introductionmentioning

confidence: 99%

Multipactor Effect Analysis and Design Rules for Wedge-Shaped Hollow Waveguides

Hueso

Vicente

Gimeno

et al. 2010

IEEE Trans. Electron Devices

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Abstract-A numerical model for predicting the multipactor breakdown effect in wedge-shaped hollow waveguides is presented in this paper. The computation of electromagnetic fields is based on the boundary integral-resonant mode expansion method, which provides the modal chart of hollow waveguides with any arbitrary cross section. The advantage of using wedge-shaped waveguides with respect to conventional rectangular ones is the deviation of the resonant paths of the electrons toward regions with lower voltages, thus reducing the probability of multipactor threshold for certain input power. To validate this method, our results have been compared with simulations from previous theoretical studies. Once the simulation tool is validated, it is used to predict the multipactor threshold of wedge-shaped waveguides with different symmetric inclination angles of their horizontal plates. Finally, susceptibility curves as the ones already available for rectangular waveguides are presented. These charts are useful for designing innovative waveguide geometries with improved multipactor-free working power ranges.Index Terms-High-power phenomenon, multipactor (MP), radio frequency (RF) breakdown threshold, susceptibility curves, wedge-shaped waveguide.

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Suppression of multipacting in rectangular coupler waveguides

Cited by 45 publications

References 8 publications

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

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

Multipactor Mitigation in Coaxial Lines by Means of Permanent Magnets

Multipactor Effect Analysis and Design Rules for Wedge-Shaped Hollow Waveguides

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