On multipactor effect in a 600 MHz RF cavity used in electron linear accelerator

Bourat, C.; Joly, J.

doi:10.1109/14.46336

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…Although multipactor is generally considered problematic in most applications, potential beneficial applications include high power microwave switches [188, 189], surface cleaning [60, 132, 190], and harmonic generation [150, 151]. Further studies in this regard might be of great interest to the rf community.…”

Section: Discussionmentioning

confidence: 99%

Recent advances in multipactor physics and mitigation

et al. 2023

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Recent progress made in the prediction, characterisation, and mitigation of multipactor discharge is reviewed for single‐ and two‐surface geometries. First, an overview of basic concepts including secondary electron emission, electron kinetics under the force law, multipactor susceptibility, and saturation mechanisms is provided, followed by a discussion on multipactor mitigation strategies. These strategies are categorised into two broad areas – mitigation by engineered devices and engineered radio frequency (rf) fields. Each approach is useful in different applications. Recent advances in multipactor physics and engineering during the past decade, such as novel multipactor prediction methods, understanding space charge effects, schemes for controlling multipacting particle trajectories, frequency domain analysis, high frequency effects, and impact on rf signal quality are presented. In addition to vacuum electron multipaction, multipactor‐induced ionization breakdown is also reviewed, and the recent advances are summarised.

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Section: Discussionmentioning

confidence: 99%

Recent advances in multipactor physics and mitigation

et al. 2023

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“…In practice, multipactor appears when a RF electric field threshold E max is reached. This phenomenon has been observed in telecommunications satellites 1 and in RF plasma heating systems of experimental fusion reactors (tokamaks) 2 , but also in particle accelerators 3 . The multipactor creates an electron cloud, leading to a disturbance or even a reflection to the source of RF signal.…”

Section: Introductionmentioning

confidence: 89%

A three-dimensional Dionne model for multipactor simulations

et al. 2020

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The multipactor phenomenon is characterized by a very fast growth of the electronic population in Radio-Frequency (RF) devices under vacuum. As this effect limits the transmissible RF power and can harm RF systems, it has been widely studied during the last decades. Due to the high cost of experimental tests, simulation tools are heavily used to predict the threshold of multipactor growth. However, their reliability is limited for complex configurations, e.g. when dielectrics or magnetic fields are present. A crucial element of these multipactor simulations is the secondary-emission model. Dionne's model is able to model both metals and dielectrics secondary emission but is one-dimension only. As the three-dimensional aspect is essential for complex configurations, the Dionne model is extended do three-dimensions. Measurements of the total electron emission yield have been carried out at the ONERA and shows a good agreement for low-impact energy and low-impact angle electrons, which is relevant in multipactor simulations.

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“…Conditions of the existence of the multipactor depend on the geometry of the vacuum chamber of the device, the configuration of the electromagnetic field, the material and the pretreatment of the inner surfaces (see, e.g. [181][182][183][184][185][186][187][188][189][190][191]). All problems of this type of discharge are considered in the Proceedings of the periodical specialized International Workshops on Multipactor, Corona and Passive Intermodulation in Space RF Hardware (MULCOPIM).…”

Section: Surface Discharges Multipactor Dischargesmentioning

confidence: 99%

Microwave discharges at low pressures and peculiarities of the processes in strongly non-uniform plasma

Lebedev

2015

Plasma Sources Sci. Technol.

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Microwave discharges (MD) are widely used as a source of non-equilibrium low pressure plasma for different applications. This paper reviews the methods of microwave plasma generation at pressures from 10 −2 approximately to 30 kPa with centimeter-millimeter wavelength microwaves on the basis of scientific publications since 1950 up to the present. The review consists of 16 sections. A general look at MDs and their application is given in the introduction, together with a description of a typical block-schema of the microwave plasma generator, classification of MD, and attractive features of MD. Sections 2-12 describe the different methods of microwave plasma generators on the basis of cavity and waveguide discharges, surface and slow wave discharges, discharges with distributed energy input, initiated and surface discharges, discharges in wave beams, discharges with stochastically jumping phases of microwaves, discharges in an external magnetic field and discharges with a combination of microwave field and dc and RF fields. These methods provide the possibility of producing nonequilibriun high density plasma in small and large chambers for many applications. Plasma chemical activity of nonequilibrium microwave plasma is analyzed in section 13. A short consideration of the history and status of the problem is given. The main areas of microwave plasma application are briefly described in section 14. Non-uniformity is the inherent property of the majority of electrical discharges and MDs are no exception. Peculiarities of physical-chemical processes in strongly non-uniform MDs are demonstrated placing high emphasis on the influence of small noble gas additions to the main plasma gas (section 15). The review is illustrated by 80 figures. The list of references contains 350 scientific publications.

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On multipactor effect in a 600 MHz RF cavity used in electron linear accelerator

Cited by 10 publications

References 2 publications

Recent advances in multipactor physics and mitigation

Recent advances in multipactor physics and mitigation

A three-dimensional Dionne model for multipactor simulations

Microwave discharges at low pressures and peculiarities of the processes in strongly non-uniform plasma

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