Hybrid resonant modes of two-sided multipactor and transition to the polyphase regime

Kryazhev, A. A.; Buyanova, M.; Semenov, V. E.; Anderson, D.; Lisak, M.; Puech, J.; Lapierre, L.; Sombrin, J.

doi:10.1063/1.1514969

Cited by 61 publications

(43 citation statements)

References 23 publications

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“…However, we never were able to reproduce the lower-left peak predicted by the theory, but note that this has not been confirmed by experimental data. We believe that validating the degree of accuracy of this theory is a challenge for either experimental researchers or computer simulationists [14]. Figure 13 shows an experiment at low pressures, where all electrons are produced at the walls.…”

Section: Resultsmentioning

confidence: 99%

“…In the future, we will probably improve the tools by adding additional output forms able to analyze further simulation data to allow further verification of theories [9,14]. More complex RF signals and geometries are under consideration.…”

Section: Discussionmentioning

confidence: 99%

“…Interestingly, the results we have obtained through simulation seem to agree with such theory. Recent questions to the Hatch and Williams theory, such as the existence of hybrid modes [14] can also be investigated with our tool, however this is up to future work. See [13] for a review of some simulation tools for MP, all of them implement models following a continuous simulation approach.…”

Section: Related Workmentioning

confidence: 99%

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CEST and MEST: Tools for the simulation of radio frequency electric discharges in waveguides

Pérez

Lara

Conde

et al. 2008

Simulation Modelling Practice and Theory

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Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in: AbstractIn this paper we present two software tools for the simulation of electron multiplication processes in radio frequency (RF) waveguides. The electric discharges are caused by the multiplication of a small initial number of electrons. These are accelerated by the RF field and produce new electrons either by collisions with the walls of the waveguide (ripping new electrons from them), or by ionization of the neutral atoms of a gas inside the device.MEST allows simulating the Multipactor effect, a discharge produced in vacuum and generated by the collision of the electrons with the walls. CEST simulates the discharge when in addition a neutral gas is present in the waveguide, at pressures lower than ground levels (often denominated Corona discharge). The main characteristic of both tools is that they implement individual-based, microscopic models, where every electron is individually represented and tracked. In the case of MEST, the simulation is discreteevent, as the trajectory of each electron can be computed analytically. In CEST we use a hybrid simulation approach. The trajectory of each electron is governed by the Langevin stochastic differential equations that take into account a deterministic RF electric force and the random interaction with the neutral atom background. In addition, wall and ionizing collisions are modelled as discrete events.The tools allow performing batches of simulations with different wall coating materials and gases, and have produced results in good agreement with experimental and theoretical data. The different output forms generated at run-time have proven to be very useful in order to analyse the different discharge processes. The tools are valuable for the selection of the most promising coating materials for the construction of the waveguide, as well as for the identification of safe operating parameters.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

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CEST and MEST: Tools for the simulation of radio frequency electric discharges in waveguides

Pérez

Lara

Conde

et al. 2008

Simulation Modelling Practice and Theory

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“…, and resonant multipactor, v 1 ≈ 2v ω + v e (see Kryazhev et al 25 for a discussion on this topic). It is seen quite clearly that these approximations are only good for rather high emission velocities.…”

Section: B Solutionsmentioning

confidence: 99%

“…Several papers published in the Soviet Union in the 70's used the assumption of evenly distributed electrons, typically calling it the polyphase regime, and derived the corresponding impact probabilities [23][24][25][26][27] . Recently, the polyphase approach has received renewed interest in connection with experiments on single-sided multipactor 28 .…”

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 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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Hybrid resonant modes of two-sided multipactor and transition to the polyphase regime

Cited by 61 publications

References 23 publications

CEST and MEST: Tools for the simulation of radio frequency electric discharges in waveguides

CEST and MEST: Tools for the simulation of radio frequency electric discharges in waveguides

Non-resonant multipactor—A statistical model

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

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