Electron-emission yield under electron impact of ceramics used as channel materials in Hall-effect thrusters

Tondu, Thomas; Belhaj, Mohamed; Inguimbert, Virginie

doi:10.1063/1.3653820

Cited by 19 publications

(17 citation statements)

References 26 publications

(23 reference statements)

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“…For a given primary energy, SEY increases with increasing angle of incidence θp. Concerning the wall temperature and electron irradiation dependences, s0 decreases while E * increases with electron irradiation and Tw (Tondu et al 2011 andBelhaj et al 2015), making the SEE process more negligible for hotter and highly irradiated surfaces.…”

Section: Conclusion: the Future Of Ht Modelingmentioning

confidence: 99%

“…(c) (d) Fig. 21 (a) Total SEE yields as a function of primary electron energy (Tondu et al 2011) for some HT wall materials with (b) zoom view around the first crossover energy (indicated with arrows). (c) Components of SEY as a function of impact electron energy and (d) energy spectrum ds/dE of secondary electrons emitted by a beam of electrons with energy Ep=50 eV.…”

Section: Conclusion: the Future Of Ht Modelingmentioning

confidence: 99%

“…SEYs and energy spectrum are computed using the Furman-Pivi (2002) Tab. III Typical values of SEY at Ep=0 and first crossover energy for wall materials relevant for HTs , Dunaevsky et al 2003, Tondu et al 2011and Villemant et al 2017.…”

Section: Conclusion: the Future Of Ht Modelingmentioning

confidence: 99%

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Latest progress in Hall thrusters plasma modelling

Taccogna

Garrigues

2019

Rev. Mod. Plasma Phys.

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In the last thirty years, numerical models have revealed different physical mechanisms involved in the Hall thruster functioning leading to a bridge between analytical prediction / empirical intuition and experiments. For this reason, modeling effort is continuously increasing in the domain of Hall Thrusters. Two basic approaches exist: one based on fluid/hybrid simulation where the distribution of electrons is assumed Maxwellian and the plasma inside the thruster, considered as quasineutral, is described with macroscopic quantities (density, velocity and energy); the second approach is based on kinetic description for charged particles where no approximation is made for the distribution of particles. Fluid or hybrid approaches offer the advantage of demanding low run times and computational resources. They are very useful to perform parametric studies but actually the anomalous phenomena responsible for electron transport across the magnetic field barrier have not been selfconsistently modeled. Kinetic approach is able to better capture phenomena originating on the Debye scale length like the lateral sheaths, ExB electron drift instability, important to explain the anomalous electron transport, but it requires very long run times. For this latter, the progress in computer science offers the advantage to describe conditions more and more close to the thruster operation. In this review, we will present the two approaches emphasizing on numerical schemes used with assumptions and approximations and on main results obtained. Future directions on the Hall thruster modeling will finally outlined.

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Section: Conclusion: the Future Of Ht Modelingmentioning

confidence: 99%

Section: Conclusion: the Future Of Ht Modelingmentioning

confidence: 99%

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Latest progress in Hall thrusters plasma modelling

Taccogna

Garrigues

2019

Rev. Mod. Plasma Phys.

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“…The extent of those modifications mainly depends on the material constituting the wall, the plasma temperature and the ions nature. Indeed, the SEE yield is characteristic of each material and is a function of the impinging electron energy 7,8 . Moreover, theoretical and numerical modeling showed that substantial changes in the sheath structure happen when the the emission overpasses a threshold that is dependent on the ion to electron mass ratio 3 .…”

Section: Introductionmentioning

confidence: 99%

Plasma sheath material induced dependence due to secondary electron emission

et al. 2020

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Plasma sheaths in front of six different materials samples (BN, BNSiO 2 , Al 2 O 3 , SiO 2 , stainless steel and silicon) used in various experiments and devices (Hall thrusters, plasma discharge, microelectronics) are studied using the Laser Induced Fluorescence diagnostic. The specific Secondary Electron Emission (SEE) yield of each material is expected to induce differences in the sheath structure from one sample to another. The experiments are carried out in two different plasma discharges (multipolar device and ECR device), exhibiting distinct electron distribution functions: bi-maxwellian and maxwellian. The agreement between the two experiments is good and allow to classify the materials in a consistent way regarding their SEE yields. The multipolar experiments results are compared to a 1D kinetic sheath model and a 1D-1V kinetic sheath simulation code. The predictions of the model are discussed and are in good agreement with previous theory. The influence of the low energy impinging electrons on the SEE yield and emissive sheaths is investigated with the code.

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“…e yield also significantly depends on the surface conditions. For aluminum with a native oxide, the emission yield [106] is significantly higher than for pure aluminum and corresponds to the yields found for dielectric materials [107,108]. erefore, in the third case, the yield for aluminum with a native oxide is used.…”

Section: Secondary Electron Emissionmentioning

confidence: 99%

Numerical study of extreme-ultra-violet generated plasmas in hydrogen

Astakhov¹

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Plasma probe characteristics in low density hydrogen pulsed plasmas, Plasma Sources Sci. Technol. 24, 055018 (2015). Exploring the electron density in plasma induced by EUV radiation: II. Numerical studies in argon and hydrogen, submied Chapter 7 D.I. Astakhov, W.J. Goedheer, C.J. Lee, V.V. Ivanov, V.M. Krivtsun, O. Yakushev, K.N. Koshelev, D. V. Lopaev, and F. Bijkerk, Numerical and experimental studies of the carbon etching in EUV-induced plasma, submiedis work is part of the research programme 'Controlling photon and plasma induced processes at EUV optical surfaces (CP3E)' of the 'Stichting voor Fundamenteel Onderzoek der Materie (FOM)', which is financially supported by the 'Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)'. e CP3E programme is co-financed by Carl Zeiss SMT and ASML. We also acknowledge financial support from Agentschap NL (EXEPT project). Aknowledgments 109 Curriculum vitae 110Bibliography 112 Краткое содержаниеДанная работа посвящена численному моделированию динамики плазмы в водороде, индуцированной мягким рентгеновским излучением. Такую плазму возможно использовать для очистки (и поддержания чистоты) поверхности оптических элементов используемых в установках проекционной литографии в диапазоне мягкого рентгена, что обуславливает актуальность данной задачи. Для моделирования плазмы использовался метод частиц в ячейках в двумерной, цилиндрически симметричной постановке. Такой подход позволил получить количественные оценки для различных величин, измеряемых в эксперименте(например, ток, прошедший через электрод), и соотнести их с параметрами плазмы, полученными в результате моделирования. Для проверки точности модели были проведены тестовые расчеты, в которых проверяли, воспроизводит ли модель результаты экспериментов с дрейфовыми трубами (см. главу 2, раздел 2.8).Следующим шагом был проведен расчет зондовой характеристики, измеренной в установке, в которой водородная плазма образовывалась в результате развития электронной лавины (см. главу 5). Конфигурация эксперимента была осе-симметричной, что позволило самосогласованно учесть влияние цилиндрического зонда на формирование плазмы. Результаты расчетов и измерений тока на зонд совпали с достаточной точностью, однако параметры плазмы полученные в расчете существенно разошлись с таковыми из анализа зондовой характеристики с помощью стандартных зондовых теорий. Эти различия указывают на то, что стандартные методы анализа зондовых характеристик в случае импульсных плазм должны применяться с осторожностью, и разница между предсказаниями разных моделей отклика зонда может трактоваться как оценка погрешности определения характеристик плазмы.Успешное моделирование эксперимента с электронной лавиной позволило перейти к более сложному случаю, и рассмотреть формирование плазмы в газе из-за поглощения мягкого рентгеновского излучения. Введение излучения в модель привело к появлению большого количества плохо определенных параметров, таких как интенсивность излучения, временная, пространственная и спектральная форма импульса излучения и т....

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Electron-emission yield under electron impact of ceramics used as channel materials in Hall-effect thrusters

Cited by 19 publications

References 26 publications

Latest progress in Hall thrusters plasma modelling

Latest progress in Hall thrusters plasma modelling

Plasma sheath material induced dependence due to secondary electron emission

Numerical study of extreme-ultra-violet generated plasmas in hydrogen

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