In-situ plasma treatment of Cu surfaces for reducing the generation of vacuum arc breakdowns

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Saressalo , A , Kilpeläinen , A , Mizohata , K , Profatilova , I , Nolvi , A , Kassamakov , I , Tikkanen , P O , Calatroni , S , Wuensch , W & Djurabekova , F 2021 , ' In-situ plasma treatment of Cu surfaces for reducing the generation of vacuum arc breakdowns ' , Journal of Applied Physics , vol. 130 , no. 14 , 143302 . https://doi.org/10.1063/5.0062674

Title: In-situ plasma treatment of Cu surfaces for reducing the generation of vacuum arc breakdowns
Author: Saressalo, Anton; Kilpeläinen, Aarre; Mizohata, Kenichiro; Profatilova, Iaroslava; Nolvi, Anton; Kassamakov, Ivan; Tikkanen, Pertti O.; Calatroni, Sergio; Wuensch, Walter; Djurabekova, Flyura
Contributor organization: Helsinki Institute of Physics
Department of Physics
Materials Physics
Date: 2021-10-14
Language: eng
Number of pages: 10
Belongs to series: Journal of Applied Physics
ISSN: 0021-8979
DOI: https://doi.org/10.1063/5.0062674
URI: http://hdl.handle.net/10138/335285
Abstract: High electric fields are present in a rapidly growing number of applications, which include elementary particle accelerators, vacuum interrupters, miniature x-ray sources, and satellites. Many of these applications are limited by the breakdown strength of the materials exposed to electric fields. Different methods have been developed to improve the quality of metal electrode surfaces, aiming to increase their breakdown strength. Not many systematical studies have been performed to provide a proper understanding of what contributes to the correlation between the breakdown strength and the quality of the surface. In this work, we apply a novel method for reducing vacuum arc breakdowns by cleaning the electrode surfaces with O and Ar plasma. The method can be used to alter the surfaces of the Cu electrodes in situ, i.e., without exposing them to air between the measurements. This plasma cleaning treatment is shown to reduce the number of surface impurities and to speed up the conditioning process of the samples under high-voltage pulses. Specifically, the first breakdown field was observed to increase by more than 90% after the plasma cleaning.
Subject: 114 Physical sciences
electrical discharge
plasma
vacuum surface interaction
VOLTAGE
METAL
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: acceptedVersion


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