Silver nanopillar coatings grown by glancing angle magnetron sputtering for reducing multipactor effect in spacecrafts
Entity
UAM. Departamento de Física AplicadaPublisher
ElsevierDate
2020-05-20Citation
10.1016/j.apsusc.2020.146699
Applied Surface Science 526 (2020): 146699
ISSN
0169-4332 (print)DOI
10.1016/j.apsusc.2020.146699Funded by
This investigation has been funded by the MINECO of Spain through the AYA2012-39832-C02-02, FIS2015-67367-C2-1-P, MAT2015-69035-REDC and MAT2014-59772-C2-1-P projects and by the Comunidad de Madrid through the NANOMAGCOST-CM Ref: P2018/NMT4321 project. One of the authors (C.M.) thanks MECD for FPU14/02020 grant. The authors also want to thank SEGAINVEX and SIdI from UAM for technical support, and to acknowledge the service from the MiNa Laboratory at IMN funded by Comunidad de Madrid (S2018/NMT-4291 TEC2SPACE), MINECO (CSIC13-4E-1794) and the European Union (FEDER, FSE)Project
Gobierno de España. AYA2012-39832-C02-02; Gobierno de España. FIS2015-67367-C2-1-P; Gobierno de España. MAT2015-69035-REDC; Gobierno de España. MAT2014-59772-C2-1-P; Comunidad de Madrid. P2018/NMT-4321/NANOMAGCOST-CM; Gobierno de España. FPU14/02020; Comunidad de Madrid. S2018/NMT-4291/TEC2SPACEEditor's Version
https://doi.org/10.1016/j.apsusc.2020.146699Subjects
Ag nanopillars; Anti-multipactor coatings; Glancing angle deposition; Magnetron sputtering; Secondary electron emission; FísicaRights
© 2020 Elsevier B.V.Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
We have studied nanometric high aspect ratio Ag nanopillar coatings exhibiting reduced secondary electron emission for the mitigation of multipactor effect in radio-frequency space devices of high frequency and high power. The Ag nanopillars have been grown by glancing angle deposition with DC magnetron sputtering. Some samples have been covered by a gold capping layer to reduce oxidation and aging effects. The secondary emission yield of the surfaces of these samples has been measured and compared to those of flat Ag and Au reference samples. The results show that high aspect ratio surface roughness at the nanometer scale significantly reduce the secondary emission yield of the surface. This reduction is more important for low electron energies, which is the most influencing energy range of electrons for multipactor. The multipactor region for the nanopillar coating presenting the best secondary emission yield properties has been simulated, finding practical suppression of multipactor effect. The high-frequency surface resistance of these samples has also been estimated from published computations for similar surface roughness patterns. It was found that such nanopillar coatings are compatible with the best accomplishments of present space industry
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Google Scholar:Troncoso, G.
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García-Martín, J. M.
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González, M. U.
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Morales, C.
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Fernández-Castro, M.
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Soler-Morala, J.
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Galán, L.
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Soriano Guillén, Leandro
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